Dtc P1604 Startability Malfunction

DESCRIPTION

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT AND RECORD FREEZE FRAME DATA (IN ADDITION TO DTC P1604)

CHECK ENGINE IMMOBILISER SYSTEM

CHECK MALFUNCTION CONDITION

READ FREEZE FRAME DATA

READ FREEZE FRAME DATA

CHECK CRANKSHAFT POSITION SENSOR INSTALLATION

CHECK CRANKSHAFT POSITION SENSOR

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

CHECK CRANKSHAFT POSITION SENSOR

READ FREEZE FRAME DATA

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

CHECK FUEL SYSTEM

READ FREEZE FRAME DATA

INSPECT FUEL INJECTOR ASSEMBLY

CHECK FUEL SYSTEM

READ FREEZE FRAME DATA

CHECK FUEL PRESSURE

CHECK FUEL INJECTOR ASSEMBLY

CHECK FUEL INJECTOR ASSEMBLY

CHECK THROTTLE BODY

CHECK INTAKE SYSTEM

PERFORM SIMULATION TEST

CHECK MALFUNCTION CONDITION

PERFORM SIMULATION TEST

INSPECT BATTERY

CHECK ENGINE ASSEMBLY

CHECK STARTER ASSEMBLY

INSPECT BATTERY

INSPECT STARTER ASSEMBLY

PERFORM SIMULATION TEST

INSPECT BATTERY

CHECK ENGINE ASSEMBLY

CHECK FUEL INJECTOR ASSEMBLY

CHECK FUEL PRESSURE

CHECK SPARK PLUG AND SPARK

CONFIRM VEHICLE CONDITION

CHECK FUEL PRESSURE

CHECK FUEL INJECTOR ASSEMBLY

INSPECT SPARK PLUG

READ VALUE USING TECHSTREAM (ENGINE SPEED)

CHECK IGNITION COIL ASSEMBLY (POWER SOURCE VOLTAGE)

CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM)

CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM)

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

READ VALUE USING TECHSTREAM (ENGINE SPEED)

CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)

CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

INSPECT MASS AIR FLOW METER

CHECK INTAKE SYSTEM

CHECK THROTTLE BODY

CHECK THROTTLE BODY

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT LINEAR)

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT EXHAUST LINEAR)

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

INSPECT MASS AIR FLOW METER

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

READ VALUE USING TECHSTREAM

PERFORM SIMULATION TEST

INSPECT AIR FUEL RATIO SENSOR

INSPECT HEATED OXYGEN SENSOR

PERFORM SIMULATION TEST

CHECK FUEL PRESSURE

INSPECT SPARK PLUG

CONFIRM VEHICLE CONDITION

CHECK FUEL PRESSURE

CHECK FUEL INJECTOR ASSEMBLY

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

CHECK MALFUNCTION CONDITION

INSPECT FUEL INJECTOR ASSEMBLY

CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)

CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

CHECK CRANKSHAFT POSITION SENSOR

CHECK CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)

CHECK CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT)

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT))

CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT))

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - ECM)

CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) - ECM)

CHECK CRANKSHAFT POSITION SENSOR

CHECK CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)

CHECK CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT)

READ VALUE USING TECHSTREAM (ISC LEARNING VALUE)

CHECK CYLINDER COMPRESSION PRESSURE

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

CHECK FUEL PRESSURE

READ VALUE USING TECHSTREAM (LONG FT #1)

PERFORM SIMULATION TEST

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

CHECK CRANKSHAFT POSITION SENSOR

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

INSPECT FUEL PUMP

CHECK FUEL PRESSURE

READ VALUE USING TECHSTREAM (LONG FT #1)

PERFORM SIMULATION TEST

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

CHECK CRANKSHAFT POSITION SENSOR

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

INSPECT FUEL PUMP

CHECK PURGE VSV

CHECK FUEL INJECTOR ASSEMBLY

CHECK INTAKE VALVE

READ VALUE USING TECHSTREAM (ISC LEARNING VALUE)

CHECK CYLINDER COMPRESSION PRESSURE

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT))

CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT))

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - ECM)

CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) - ECM)

CHECK CRANKSHAFT POSITION SENSOR

CHECK CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)

CHECK CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT)

DTC P1604 Startability Malfunction

DESCRIPTION

This DTC is stored when the engine does not start even though the STA signal is input or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts.
Using the Techstream, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.
It is necessary to check if the vehicle ran out of fuel before performing troubleshooting, as this DTC is also stored when there is engine starting trouble due to running out of fuel.

DTC No.	DTC Detection Condition	Trouble Area
P1604	Either condition is met (1 trip detection logic): The engine speed is below 500 rpm with the STA signal on for a certain amount of time (refer to the illustration below). After the engine starts (engine speed is 500 rpm or more), the engine speed drops to 200 rpm or less within approximately 2 seconds.	Immobiliser system Engine assembly (excess friction, compression loss) Starter assembly Crankshaft position sensor Camshaft position sensor Engine coolant temperature sensor Fuel pump Fuel pump control system Fuel pipes Fuel injector Throttle body Pressure regulator Battery Drive plate*1 Flywheel*2 Spark plug Ignition coil circuit Intake system Camshaft timing oil control valve (for intake or exhaust camshaft) Mass air flow meter Air fuel ratio sensor Valve timing Fuel Purge VSV Intake valve ECM

1. *1: for Automatic transaxle models
   
2. *2: for Manual transaxle models
   

Reference waveforms showing a normal cold engine start

Reference waveforms showing a normal warm engine start

Reference values when there is an air leak in the intake system during starting difficulty

Freeze Frame Data P1604 Startability Malfunction

Engine
Current	P1604: Startability Malfunction
	Time Freeze Frame Data
	Item	Data1	Data2	Data3	Data4	Data5	Unit
	Engine Speed	1489	986	345	186	124	rpm
	Calculate Load	36.2	28.2	31.4	92.4	94.6	%
	Vehicle Load	7.9	7.9	9.2	7.2	6.0	%
	MAF	10.12	5.04	2.79	0.81	0.68	gm/s
	Atmosphere Pressure	-0	-0	-0	-0	-0	kPa
	Coolant Temp	85	85	85	85	85	°C
	Intake Air	39	39	39	39	39	°C
	Battery Voltage	13.222	13.300	12.109	11.972	11.854	V
	Throttle Sensor Volt %	16.5	16.5	16.0	15.6	15.6	%
	Throttl Sensor #2 Volt %	48.2	48.2	47.8	47.2	47.2	%
	Throttle Sensor Position	0.0	0.0	0.0	0.0	0.0	%
	Throttle Motor DUTY	16.5	16.5	16.0	15.6	15.6	%
	Injector (Port)	3628	2620	2744	2744	2744	μs
	Injection Volume (Cylinder 1)	3.062	0.226	0.226	0.226	0.226	ml
	Fuel Pump/Speed Status	ON	ON	ON	ON	ON
	EVAP (Purge) VSV	0.0	0.0	0.0	0.0	0.0	%
	Evap Purge Flow	0.0	0.0	0.0	0.0	0.0	%
	Purge Density Learn Value	0.000	0.000	0.000	0.000	0.000
	EVAP System Vent Valve	OFF	OFF	OFF	OFF	OFF
	EVAP Purge VSV	OFF	OFF	OFF	OFF	OFF
	Purge Cut VSV Duty	0.0	0.0	0.0	0.0	0.0	%
	Target Air-Fuel Ratio	0.998	0.998	0.998	0.998	0.998
	AF Lambda B1S1	0.999	0.999	0.999	0.999	0.999
	AFS Voltage B1S1	3.258	3.258	3.258	3.258	3.258	V
	O2S B1S2	0.000	0.000	0.000	0.000	0.000	V
	Short FT #1	0.000	0.000	0.000	0.000	0.000	%
	Long FT #1	8.782	4.354	-2.665	-2.665	-2.665	%
	Total FT #1	0.058	0.058	0.058	0.058	0.058
	Fuel System Status #1	OL	OL	OL	OL	OL
	IGN Advance	0.0	10.5	16.5	18.0	18.0	Deg
	Knock Feedback Value	-1.5	-1.5	-1.5	-1.5	-1.5	deg(CA)
	Knock Correct Learn Value	17.0	17.0	17.0	17.0	17.0	deg(CA)
	Starter Signal	Close	Close	Close	Close	Close
	Ambient Temperature	21	21	21	21	21	°C

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

1. In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1604 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as starting difficulty.
   As these DTCs can be stored as a result of certain user actions, even if these DTCs are output, if the customer makes no mention of problems, clear these DTCs without performing any troubleshooting and return the vehicle to the customer.
   
2. If any other DTCs are output, perform troubleshooting for those DTCs first.
   
3. When the Data List item "Immobiliser Fuel Cut" is ON, the engine cannot be started.
   
4. Read freeze frame data using the Techstream. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.
   
5. When confirming the freeze frame data, be sure to check all 5 sets of freeze frame data (COROLLA_ZRE142 RM000000PDS0TTX.html).
   
6. When confirming freeze frame data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.
   
7. Try to start the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and compare it with the freeze frame data.
   
8. If the malfunction does not reoccur, carefully check the vehicle conditions from when the malfunction occurred using freeze frame data.
   
9. When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.
   
10. If the same inspection or replacement procedure appears 2 times when performing an inspection procedure, it is not necessary to repeat the procedure the second time.
    

Malfunction Recurrence and Inspection Areas

1. Freeze frame data exists, but the malfunction (starting difficulty) has not reoccurred and the malfunction conditions are unknown.

   1. The engine speed recorded in the freeze frame data is 0 rpm (the engine does not crank).
      

      HINT:

      One of the following problems may be present: battery depletion, excess engine friction, a starter malfunction or a crankshaft position sensor malfunction.

      1. If the battery voltage is less than 6 V during cranking, there is a high probability that engine friction is abnormal.
         
      2. If the battery voltage drops to 5 V or less when starting the engine, the battery may be malfunctioning.
         
      
      
      3. Even when the engine speed is indicated as 0 rpm, if the battery voltage fluctuates while cranking the engine, it can be concluded that cranking is being performed. In such a case, the crankshaft position sensor and/or an ECM may be malfunctioning.
         
         
         
         
         
         

   2. All engine speeds recorded in the freeze frame data are between 100 and 250 rpm (the engine cranks but there is no combustion).
      

      HINT:

      If the engine speed is between 100 and 250 rpm (no initial combustion), there may be a wiring problem or a complete failure of an ignition or fuel system part.

      
      
      1. Due to an engine coolant temperature sensor malfunction, the fuel injection volume is extremely high or low and the engine may not be able to be started.
         
         
         
         
         
         

   3. The engine speed recorded in the freeze frame data is 250 rpm or higher (the initial combustion and starter turnoff timing is too late).
      

      HINT:

      If the engine speed is 250 rpm or higher (combustion occurs but the initial combustion and starter turnoff timing is too late), the fuel injection volume is often incorrect (too low or too high) and determining the cause of the malfunction is often difficult.

      1. Due to an engine coolant temperature sensor malfunction, the fuel injection volume is extremely high or low and engine starting trouble may occur.
         
      2. If Long FT #1 is incorrect, there may be a fuel supply problem due to the injectors or fuel pump being clogged, etc.
         
      
      
      3. If the engine cranking speed is too high, compression loss may have occurred due to carbon interfering with the valve operation.
         
         
         
         
         
         

2. When the malfunction (starting difficulty) can be reproduced, or malfunction conditions are known, perform the following inspections ("Problem symptoms" and "Systems to inspect"):

   1. Problem symptoms
      

      1. The engine does not crank.
         

         HINT:

         The starter is normal if a noise that indicates the starter pinion gear is extending is heard. The battery may be fully depleted or there may be excess engine friction.

      2. The engine cranking speed is abnormal.
         

         HINT:

         If the engine cranking speed is too high (for example, 300 rpm or higher with no combustion), compression loss may have occurred because carbon interfered with valve operation, etc.

      3. There is no initial combustion.
         

         HINT:

         If there is no initial combustion, there is probably a wiring problem or an ignition or fuel system part malfunction.

      4. The engine stalls after starter turnoff.
         

         HINT:

         If the engine stalls after starter turnoff, the air-fuel ratio may be incorrect or the VVT may have a problem returning.

      5. The initial combustion and starter turnoff occur late.
         

         HINT:

         If the initial combustion and starter turnoff occur late, the fuel injection volume is probably incorrect (too low or too high).

         HINT:

         Causes of fuel system malfunctions according to conditions present at the time of the malfunction.

         1. When 2 to 3 minutes have elapsed after stopping the engine: Fuel pressure loss due to the pressure regulator failing to maintain the fuel pressure.
            
         2. When 15 to 120 minutes have elapsed after stopping the engine: Problem with injector fuel seal.
            
         3. When a long time has elapsed after stopping the engine: Pressure regulator is stuck open.
            

   2. Systems to inspect.
      

      1. Intake system
         
      2. Ignition system
         
      3. Fuel system
         

INSPECTION FLOW

1. Freeze frame data exists, but the malfunction (starting difficulty) has not reoccurred and the malfunction conditions are unknown.
   
   

   Freeze Frame Data Item	Result	Suspected Area	Procedure
   Engine Speed	0 rpm (no engine cranking at all)	Battery fully depleted Engine assembly (excess friction) Starter assembly Immobiliser system Crankshaft position sensor ECM	4 to 9
   	100 to 250 rpm (engine cranks but no initial combustion*1)	Fuel pump control system Ignition system Engine coolant temperature sensor Fuel injection system	10 to 14
   	250 rpm or higher (combustion occurs but initial combustion and starter turnoff*2 occur late)	Engine assembly (compression loss) Fuel injection system Fuel pump control system	15 to 23

   HINT:

   1. *1: First combustion after cranking begins.
      
   2. *2: Condition when engine speed increases and starter can be turned off.
      

2. When the malfunction (starting difficulty) can be reproduced, or when malfunction conditions are known.

   1. Problem symptoms
      
      

      Problem Symptom	Suspected Area	Suspected Component	Procedure
      The engine does not crank	Battery malfunction	Battery fully depleted	26 to 31
      	Starting system	Starter (includes pinion gear wear or tooth damage) Starting system
      	Immobiliser system	Immobiliser system
      	Engine assembly	Engine assembly (excess friction) Drive plate wear or tooth damage*1 Flywheel wear or tooth damage*2
      Cranking speed too low	Battery malfunction	Battery fully depleted	32 to 34
      	Starting system	Starter assembly
      	Engine assembly	Engine assembly (excess friction)
      Cranking speed too high	Engine assembly	Engine assembly (compression loss)
      There is no initial combustion	Fuel supply problem	Maintenance of fuel pressure by pressure regulator Fuel injector leak Fuel leak from fuel line Fuel pump control system Fuel pump	35 to 50
      	Ignition system malfunction	Spark plug Crankshaft position sensor Ignition coil
      Engine stalls after starter turnoff	Air suction	Intake system connections	51 to 57
      	Deposits in throttle body	Throttle body
      	VVT valve does not return properly	Camshaft timing oil control valve (for intake or exhaust camshaft) VVT system
      	Mass air flow meter sub-assembly malfunction	Mass air flow meter
      The initial combustion and starter turnoff occur late	Engine coolant temperature sensor malfunction	Engine coolant temperature sensor	58 to 72
      	Mass air flow meter sub-assembly malfunction	Mass air flow meter
      	Abnormal air fuel ratio learning value	Air fuel ratio sensor
      	Deviation from fuel injection characteristics	Fuel injector
      	Wet-fouled or dry-fouled spark plug	Spark plug
      	Lack of fuel pressure	Pressure regulator Fuel pump Fuel pump control system

      1. *1: for Automatic transaxle models
         
      2. *2: for Manual transaxle models
         

   2. Systems to inspect
      
      

      Troubleshooting by System	Suspected Area	Suspected Component	Procedure
      Fuel system troubleshooting A	Abnormal air fuel ratio learning value	Fuel injector	92 to 99 100 to 107
      	Rough idling	Crankshaft position sensor
      	Abnormal fuel pressure	Fuel Fuel leak from fuel line Fuel pump Pressure regulator
      Fuel system troubleshooting B	Abnormal concentration of HC in surge tank	Purge VSV system Fuel injector Intake valve	108 to 110
      Fuel system troubleshooting C	Injection signal system malfunction	Fuel injector Crankshaft position sensor Camshaft position sensor (for intake or exhaust camshaft) ECM	74 to 79
      Intake system troubleshooting	Difference between ISC target value and opening angle when idling	Engine assembly (compression loss) Valve timing Engine coolant temperature sensor ECM	89 to 91 111 to 113
      Ignition system troubleshooting	Camshaft and/or crankshaft position sensor signal malfunction	Crankshaft position sensor system (including sensor installation) Camshaft position sensor (for intake or exhaust camshaft) system (including sensor installation) ECM	80 to 88 114 to 122

1.CHECK ANY OTHER DTCS OUTPUT AND RECORD FREEZE FRAME DATA (IN ADDITION TO DTC P1604)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   

5. Read the DTCs and record the Freeze Frame Data.
   

   HINT:

   1. This freeze frame data shows the actual engine conditions when engine starting trouble occurred.
      
   2. When confirming the freeze frame data, be sure to check all 5 data sets of freeze frame data.
      
   3. The fourth set of freeze frame data is the data recorded when the DTC is stored.
      

   Result:

   Result	Proceed to
   Only DTC P1604 is output	A
   DTCs other than P1604 are output	B

B	GO TO DTC CHART (COROLLA_ZRE142 RM000000PDF0G8X.html)

A

2.CHECK ENGINE IMMOBILISER SYSTEM

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Immobiliser Fuel Cut.
   

5. Read the value displayed on the Techstream.
   

   OK:

   Immobiliser Fuel Cut is OFF
   

   
   

   Result:

   
   

   Result	Proceed to
   OK	A
   NG (w/ smart key system)	B
   NG (w/o smart key system)	C

   HINT:

   If the engine is cranked immediately after reconnecting the battery cable (key verification for immobiliser system not completed), the engine cannot be started. Key verification needs to wait for several seconds after turning the ignition switch to ON.

B	CHECK ENGINE IMMOBILISER SYSTEM (COROLLA_ZRE142 RM000000QY40ALX.html)
C	CHECK ENGINE IMMOBILISER SYSTEM (COROLLA_ZRE142 RM000001GUQ043X.html)

A

3.CHECK MALFUNCTION CONDITION

1. Confirm the problem symptoms.
   
   

   Result:

   
   

   Result	Proceed to
   Freeze frame data exists, but the problem symptoms cannot be reproduced and the malfunction conditions are unknown	A
   The problem symptoms can be reproduced, or the malfunction conditions are known	B

B	Go to step 25

A

4.READ FREEZE FRAME DATA

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored (COROLLA_ZRE142 RM000000PDS0TTX.html).
   
   

   Result:

   
   

   Freeze Frame Data Item for DTC P1604		Suspected Area	Proceed to
   Engine Speed	Battery Voltage
   All 0 rpm (no engine cranking at all)	Minimum voltage is less than 5 V	Battery fully depleted	A
   	Minimum voltage is 5 V or higher	Starter malfunction Crankshaft position sensor system Excess engine friction Immobiliser system ECM	B
   100 to 250 rpm (engine cranks but no initial combustion)	-	Fuel pump control system Ignition system Engine coolant temperature sensor Immobiliser system Fuel injection system	C
   250 rpm or higher (combustion occurs but initial combustion and starter turnoff occur late)	-	Engine assembly Fuel injection system Fuel pump control system	D

   HINT:

   When DTC P1604 is stored, either "Engine Start Hesitation"*1 or "Low Rev for Eng Start"*2 in the Freeze Frame Data will be ON. If "Low Rev for Eng Start" is ON, proceed to E.

   *1: This value turns ON when the engine speed does not reach a certain value for a certain period of time when starting the engine.

   *2: This value turns ON when the engine stalls immediately after starting the engine. If "Low Rev for Eng Start" is ON, as there is a possibility that the low engine speed or engine stall was caused by the user, confirm the following freeze frame data items.

   1. Immobiliser Fuel Cut
      
   2. Engine Speed (Starter off)
      

B	Go to step 5
C	Go to step 10
D	Go to step 15
E	Go to step 51

A
CHARGE OR REPLACE BATTERY

5.READ FREEZE FRAME DATA

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored (COROLLA_ZRE142 RM000000PDS0TTX.html).
   
   

   Result:

   
   

   Freeze Frame Data Item for DTC P1604	Result	Suspected Area	Proceed to
   Battery Voltage	Minimum voltage is 6 V or higher and voltage does not fluctuate*1	Starter system	A
   	Minimum voltage is 6 V or higher and voltage fluctuates*2, *3	Crankshaft position sensor system ECM	B
   	Minimum voltage is 5 to 6 V*4	Excess engine friction Battery fully depleted	C

   HINT:

   
   
   1. *1: The 5 sets of freeze frame data show approximately the same battery voltage.
      
   2. *2: The 5 sets of freeze frame data show different battery voltages.
      
   3. *3: If the voltage fluctuates, it can be determined that cranking is being performed normally. When the engine speed is 0 rpm, the crankshaft position sensor system and/or the ECM may be malfunctioning.
      
   4. *4: There may be excess engine friction. Make sure that the crankshaft rotates smoothly when turning it by hand. Excess engine friction may have occurred temporarily. Remove the cylinder head cover and oil pan, and check for foreign matter such as iron fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts.
      

B	Go to step 6
C	CHECK AND REPAIR ENGINE OR BATTERY

A
CHECK CRANKING HOLDING FUNCTION CIRCUIT (COROLLA_ZRE142 RM000001FLC087X.html)

6.CHECK CRANKSHAFT POSITION SENSOR INSTALLATION

1. Check the tightening and installation condition of the crankshaft position sensor bolt.
   

2. Check the connection of the crankshaft position sensor connector.
   

   OK:

   Sensor is installed correctly.
   

NG	SECURELY REINSTALL CRANKSHAFT POSITION SENSOR (COROLLA_ZRE142 RM0000030L0014X.html)

OK

7.CHECK CRANKSHAFT POSITION SENSOR

1. Disconnect the crankshaft position sensor connector.
   

2. Check for oil on the connector terminals.
   

   OK:

   No oil on the terminals.
   

3. Reconnect the crankshaft position sensor connector.
   

NG	REPLACE CRANKSHAFT POSITION SENSOR (COROLLA_ZRE142 RM0000030L2013X.html)

OK

8.CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

1. Disconnect the crankshaft position sensor connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B13-1 - B31-93 (NE+)	Always	Below 1 Ω
   B13-2 - B31-117 (NE-)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B13-1 or B31-93 (NE+) - Body ground	Always	10 kΩ or higher
   B13-2 or B31-117 (NE-) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the crankshaft position sensor connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (COROLLA_ZRE142 RM0000030L2013X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

OK
END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

10.READ FREEZE FRAME DATA

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored (COROLLA_ZRE142 RM000000PDS0TTX.html).
   
   

   Result:

   
   

   Freeze Frame Data Item for DTC P1604			Suspected Area	Proceed to
   Coolant Temp, Ambient Temp for A/C, Intake Air	Coolant Temp, Ambient Temp for A/C	Fuel Pump/Speed Status
   Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is 10°C (18°F) or more*1	Coolant Temp is 125°C (257°F) or more, or lower than Ambient Temp for A/C by 15°C (59°F) or more	-	Engine coolant temperature sensor	A
   	Other than above	All 5 sets of freeze frame data are ON	-	B
   		At least 1 of the 5 sets of freeze frame data is OFF	Fuel pump control circuit	C
   Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is less than 10°C (18°F)*2	-	At least 1 of the 5 sets of freeze frame data is OFF	Fuel pump control circuit	C
   		All 5 sets of freeze frame data are ON	-	B

   HINT:

   1. *1: A long time had not elapsed after stopping the engine.
      
   2. *2: A long time had elapsed after stopping the engine.
      

B	Go to step 11
C	CHECK FUEL PUMP CONTROL CIRCUIT (COROLLA_ZRE142 RM0000027680A7X.html)

A
REPLACE ENGINE COOLANT TEMPERATURE SENSOR (COROLLA_ZRE142 RM0000030LG014X.html)

11.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

1. Connect the Techstream to the DLC3.
   

2. Disconnect the fuel pump connector.
   

3. Turn the ignition switch to ON.
   

4. Turn the Techstream on.
   

5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
   

6. Measure the voltage according to the value(s) in the table below.
   
   

   Standard Voltage:

   
   

   Tester Connection	Condition	Specified Condition
   L17-4 - Body ground	Active Test is being performed	11 to 14 V

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

7. Reconnect the fuel pump connector.
   

NG	CHECK FUEL PUMP CONTROL CIRCUIT (COROLLA_ZRE142 RM0000027680A7X.html)

OK

12.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)

1. Disconnect the fuel injector connector.
   

2. Turn the ignition switch to ON.
   

3. Measure the voltage according to the value(s) in the table below.
   

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   B9-1 - Body ground	Ignition switch ON	11 to 14 V
   B10-1 - Body ground	Ignition switch ON	11 to 14 V
   B11-1 - Body ground	Ignition switch ON	11 to 14 V
   B12-1 - Body ground	Ignition switch ON	11 to 14 V

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the fuel injector connector.
   

NG	CHECK FUEL INJECTOR CIRCUIT (COROLLA_ZRE142 RM000000ZRM0FVX.html)

OK

13.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
   

5. When performing the Active Test, check for fuel leakage from the fuel pipes.
   
   

   Result:

   
   

   Result	Proceed to
   Fuel leakage or signs of fuel leakage are present	A
   No fuel leakage or signs of fuel leakage	B

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. When performing the Active Test, if there is no operating noise from the fuel pump, the fuel pump system may be malfunctioning.
      
   3. Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.
      

B	Go to step 14

A
REPAIR OR REPLACE HARNESS OR CONNECTOR

14.CHECK FUEL SYSTEM

1. Check for foreign matter such as iron particles around the fuel pump (fuel pump, fuel pump filter, and inside the fuel tank), and for signs that the fuel pump was stuck.
   
   

   Result:

   
   

   Result	Proceed to
   There is foreign matter or signs that fuel pump was stuck	A
   There is no foreign matter and no signs that fuel pump was stuck	B

B	Go to step 24

A
REPAIR OR REPLACE FUEL SYSTEM

15.READ FREEZE FRAME DATA

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored (COROLLA_ZRE142 RM000000PDS0TTX.html).
   
   

   Result:

   
   

   Freeze Frame Data Item for DTC P1604				Suspected Area	Proceed to
   Coolant Temp, Ambient Temp for A/C, Intake Air	Coolant Temp, Ambient Temp for A/C	Long FT #1	Engine Speed
   Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is 10°C (18°F) or more	Coolant Temp is 125°C (257°F) or more, or lower than Ambient Temp for A/C by 15°C (59°F) or more	-	-	Engine coolant temperature sensor	A
   	Other than above	-15% or less, or +15% or more	-	Fuel pump control system Fuel injector assembly	B
   		-15 to +15%	Minimum speed is 300 rpm or more*	Engine assembly	C
   			Minimum speed is below 300 rpm	Fuel system Intake air system	D
   Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is less than 10°C (18°F)	-	-15% or less, or +15% or more	-	Fuel pump control system Fuel injector assembly	B
   		-15 to +15%	Minimum speed is 300 rpm or more*	Engine assembly	C
   			Minimum speed is below 300 rpm	Fuel system Intake air system	D

   HINT:

   *: Compression loss may have occurred in the engine assembly.

B	Go to step 16
C	CHECK AND REPAIR ENGINE ASSEMBLY
D	Go to step 18

A
REPLACE ENGINE COOLANT TEMPERATURE SENSOR (COROLLA_ZRE142 RM0000030LG014X.html)

16.INSPECT FUEL INJECTOR ASSEMBLY

1. Check that no carbon is stuck to the fuel injector assembly.
   

   OK:

   No carbon present.
   

NG	REPLACE FUEL INJECTOR ASSEMBLY (COROLLA_ZRE142 RM000001EDS05LX.html)

OK

17.CHECK FUEL SYSTEM

1. Check for foreign matter such as iron particles around the fuel pump (fuel pump, fuel pump filter, and inside the fuel tank), and for signs that the fuel pump was stuck.
   
   

   Result:

   
   

   Result	Proceed to
   There is foreign matter or signs that fuel pump was stuck	A
   There is no foreign matter and no signs that fuel pump was stuck	B

B	Go to step 24

A
REPAIR OR REPLACE FUEL SYSTEM

18.READ FREEZE FRAME DATA

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored (COROLLA_ZRE142 RM000000PDS0TTX.html).
   
   

   Result:

   
   

   Freeze Frame Data Item for DTC P1604	Result	Suspected Area	Proceed to
   Coolant Temp	Engine coolant temperature is 40°C (104°F) or less*1	Pressure regulator	A
   	Engine coolant temperature is 40 to 90°C (104 to 194°F)*2	Fuel injector assembly	B
   	Engine coolant temperature is 90°C (194°F) or more*3	Pressure regulator	A

   HINT:

   *1: If the engine coolant temperature is 40°C (104°F) or less (after stopping the engine and the vehicle is not driven for a long period of time), the pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

   *2: If the engine coolant temperature is 40 to 90°C (104 to 194°F) (15 to 120 minutes have passed after stopping the engine), there may be fuel leaking from a fuel injector.

   *3: If the engine coolant temperature is 90°C (194°F) or more (2 to 5 minutes have passed after stopping the engine), there may be a problem with the pressure regulator failing to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

B	Go to step 20

A

19.CHECK FUEL PRESSURE

HINT:

For the fuel pressure inspection, refer to the following procedures (COROLLA_ZRE142 RM000001IQZ09UX_01_0002.html).

1. Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.
   

   Standard:

   147 kPa (1.5 kgf/cm², 21 psi) or higher (5 minutes after stopping the engine)
   

   HINT:

   If the engine cannot be started, read the values after cranking the engine.

   
   

   Result:

   
   

   Result	Proceed to
   NG	A
   OK	B

B	Go to step 24

A
REPLACE PRESSURE REGULATOR (COROLLA_ZRE142 RM000002YQ405DX.html)

20.CHECK FUEL INJECTOR ASSEMBLY

1. Clean the inside of the surge tank with compressed air.
   

2. After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes.
   
   

   Result:

   
   

   Result	Proceed to
   4000 ppm or higher	A
   Less than 4000 ppm	B

   HINT:

   If the concentration is 4000 ppm or higher, a fuel injector may have a sealing problem.

B	Go to step 22

A

21.CHECK FUEL INJECTOR ASSEMBLY

1. Inspect the fuel injectors (COROLLA_ZRE142 RM000001EDQ04ZX.html).
   
   

   Result:

   
   

   Result	Proceed to
   NG	A
   OK	B

B	Go to step 22

A
REPLACE FUEL INJECTOR ASSEMBLY (COROLLA_ZRE142 RM000001EDS05LX.html)

22.CHECK THROTTLE BODY

1. Check if carbon is in the air flow passage.
   
   

   Result:

   
   

   Result	Proceed to
   Carbon in passage	A
   No carbon present	B

B	Go to step 23

A
CLEAN OR REPLACE THROTTLE BODY (COROLLA_ZRE142 RM0000030MA016X.html)

23.CHECK INTAKE SYSTEM

1. Check the intake system for vacuum leaks (COROLLA_ZRE142 RM000003410016X.html).
   

   OK:

   No leaks from intake system.
   

NG	REPAIR OR REPLACE INTAKE SYSTEM

OK

24.PERFORM SIMULATION TEST

1. Check if the engine can be started.
   
   

   Result:

   
   

   Result	Proceed to
   Engine can be started	A
   Engine cannot be started	B

B	Go to step 25

A
END

25.CHECK MALFUNCTION CONDITION

1. Confirm the problem symptoms.
   

   HINT:

   The problem symptoms below can be determined by reading the freeze frame data.

   
   

   Result:

   
   

   Problem Symptom	Suspected Area	Proceed to
   The engine does not crank	Battery fully depleted Starter (includes pinion gear wear or teeth damage) Starter system Engine assembly (excess friction) Drive plate wear or teeth damage*4 Flywheel wear or teeth damage*5	A
   Abnormal cranking speed	Battery fully depleted Starter Engine assembly (excess friction, compression loss)	B
   There is no initial combustion (combustion does not occur even once)*1	Fuel pressure of pressure regulator maintained Fuel injector leak Fuel leak from fuel line Fuel pump control system Fuel pump Spark plug Crankshaft position sensor Ignition coil system	C
   The engine stalls after starter turnoff (engine stalls immediately after the first time the engine speed increases)*2	Intake system connections Throttle body Camshaft timing oil control valve Mass air flow meter sub-assembly	D
   The initial combustion and starter turnoff occur late*3	Engine coolant temperature sensor Mass air flow meter sub-assembly Air fuel ratio sensor Heated oxygen sensor Fuel injector Spark plug Pressure regulator Fuel pump Fuel pump control system	E

   HINT:

   1. If there is hesitation (cranking speed is slow and combustion occurs before passing TDC) during the initial cranking period, the battery charge may be insufficient or the starter may be malfunctioning.
      
   2. *1: If there is no initial combustion, a wire harness may be malfunctioning, or the ignition or fuel system may be malfunctioning.
      
   3. *2: If the engine stalls after starter turnoff, the air-fuel ratio may be incorrect or the camshaft timing oil control valve may have a problem returning.
      
   4. *3: If the initial combustion and starter turnoff occur late, the fuel injection volume may be incorrect (too low or too high).
      
   5. *4: for Automatic transaxle models
      
   6. *5: for Manual transaxle models
      

B	Go to step 32
C	Go to step 35
D	Go to step 51
E	Go to step 58

A

26.PERFORM SIMULATION TEST

1. When cranking the engine, check for a noise indicating that the starter pinion gear is extending, and check that the starter pinion gear is not spinning freely.
   
   

   Result:

   
   

   Problem Symptom	Suspected Area	Proceed to
   A noise indicating that the starter pinion gear is extending is heard and the starter pinion gear is not spinning freely*1	Battery Excess engine friction Starter	A
   A noise indicating that the starter pinion gear is extending is heard but the starter pinion gear is spinning freely	Drive plate*2 Flywheel*3 Starter	B
   A noise indicating that the starter pinion gear is extending is not heard	Battery Starter Starter system	C

   HINT:

   1. *1: The battery may be fully depleted or there may be excess engine friction.
      
   2. *2: for Automatic transaxle models
      
   3. *3: for Manual transaxle models
      

B	Go to step 29
C	Go to step 30

A

27.INSPECT BATTERY

1. Inspect the battery (COROLLA_ZRE142 RM000001AR909SX.html).
   

NG	CHARGE OR REPLACE BATTERY

OK

28.CHECK ENGINE ASSEMBLY

1. Check that the crankshaft rotates smoothly when rotating it by hand.
   

   OK:

   Crankshaft rotates smoothly.
   

   HINT:

   Excess engine friction may have occurred temporarily. Remove the cylinder head cover and oil pan, and check for foreign matter such as iron fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts.

NG	REPAIR OR REPLACE ENGINE ASSEMBLY

OK
INSPECT STARTER ASSEMBLY (COROLLA_ZRE142 RM0000034TA013X.html)

29.CHECK STARTER ASSEMBLY

1. Remove the starter assembly (COROLLA_ZRE142 RM0000034TC012X.html).
   

2. Check for starter pinion gear wear and damage.
   
   

   Standard:

   There is no wear or damage.
   

   
   

   Result

   Result	Proceed to
   NG	A
   OK (Automatic transaxle models)	B
   OK (Manual transaxle models)	C

3. Install the starter assembly (COROLLA_ZRE142 RM0000034T9012X.html).
   

B	REPLACE DRIVE PLATE & RING GEAR SUB-ASSEMBLY (COROLLA_ZRE142 RM000002WH607RX_01_0155.html)
C	REPLACE FLYWHEEL SUB-ASSEMBLY (COROLLA_ZRE142 RM000002WH607RX_01_0117.html)

A
REPLACE STARTER ASSEMBLY (COROLLA_ZRE142 RM0000034TC012X.html)

30.INSPECT BATTERY

1. Inspect the battery (COROLLA_ZRE142 RM000001AR909SX.html).
   

NG	CHARGE OR REPLACE BATTERY

OK

31.INSPECT STARTER ASSEMBLY

1. Inspect the starter assembly (COROLLA_ZRE142 RM0000034TA013X.html).
   

NG	REPLACE STARTER ASSEMBLY (COROLLA_ZRE142 RM0000034TC012X.html)

OK
CHECK CRANKING HOLDING FUNCTION CIRCUIT (COROLLA_ZRE142 RM000001FLC087X.html)

32.PERFORM SIMULATION TEST

1. Check the cranking speed.
   
   

   Result:

   
   

   Problem Symptom	Suspected Area	Proceed to
   Cranking speed is slow (100 rpm or less)	Battery Starter assembly Excess engine friction	A
   Cranking speed is fast (300 rpm or more)*	Engine compression loss	B

   HINT:

   *: If the cranking speed is fast, there may be compression loss.

B	CHECK AND REPAIR ENGINE ASSEMBLY

A

33.INSPECT BATTERY

1. Inspect the battery (COROLLA_ZRE142 RM000001AR909SX.html).
   

NG	CHARGE OR REPLACE BATTERY

OK

34.CHECK ENGINE ASSEMBLY

1. Check that the crankshaft rotates smoothly when rotating it by hand.
   

   OK:

   Crankshaft rotates smoothly.
   

   HINT:

   Excess engine friction may have occurred temporarily. Remove the cylinder head cover and oil pan, and check for foreign matter such as iron fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts.

NG	REPAIR OR REPLACE ENGINE ASSEMBLY

OK
INSPECT STARTER ASSEMBLY (COROLLA_ZRE142 RM0000034TA013X.html)

35.CHECK FUEL INJECTOR ASSEMBLY

1. Using a sound scope or screwdriver, check for an fuel injector assembly operating noise while cranking the engine.
   

   OK:

   Fuel injector assembly operating noise is heard.
   

NG	Go to step 48

OK

36.CHECK FUEL PRESSURE

1. Inspect the fuel pressure (COROLLA_ZRE142 RM000001IQZ09UX_01_0002.html).
   

NG	Go to step 46

OK

37.CHECK SPARK PLUG AND SPARK

1. Check for sparks (COROLLA_ZRE142 RM000001QVP061X.html).
   

NG	Go to step 41

OK

38.CONFIRM VEHICLE CONDITION

1. Confirm the conditions present when the malfunction occurred based on the customer problem analysis.
   
   

   Result:

   
   

   Problem Symptom	Suspected Area	Proceed to
   When the engine is stopped and a long time has passed, engine starting trouble occurs*1	Pressure regulator is stuck open	A
   When the engine is stopped and approximately 15 to 120 minutes have passed, engine starting trouble occurs*2	Fuel injector leak	B
   When the engine is stopped and approximately 2 to 3 minutes have passed, engine starting trouble occurs*3	Failure to maintain fuel pressure by pressure regulator	A
   Condition other than above, or there is an inconsistency in the conditions present when engine starting trouble occurs	-	C*4

   HINT:

   *1: The pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

   *2: Fuel may be leaking from a fuel injector assembly.

   *3: The pressure regulator may not be able to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

   *4: From step 73, perform fuel system troubleshooting C (steps 74 to 79).

B	Go to step 40
C	Go to step 73

A

39.CHECK FUEL PRESSURE

HINT:

For the fuel pressure inspection, refer to the following procedures (COROLLA_ZRE142 RM000001IQZ09UX_01_0002.html).

1. Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.
   
   

   Result:

   
   

   Result	Proceed to
   Less than 147 kPa (1.5 kgf/cm2) (5 minutes after stopping the engine)	A
   147 kPa (1.5 kgf/cm2) or higher (5 minutes after stopping the engine)	B*

   HINT:

   1. If the engine cannot be started, check the fuel pressure after cranking the engine.
      
   2. *: From step 73, perform fuel system troubleshooting C (steps 74 to 79).
      

B	Go to step 73

A
REPLACE PRESSURE REGULATOR (COROLLA_ZRE142 RM000002YQ405DX.html)

40.CHECK FUEL INJECTOR ASSEMBLY

1. After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes.
   
   

   Result:

   
   

   Result	Proceed to
   4000 ppm or higher	A
   Less than 4000 ppm	B*

   HINT:

   1. If the concentration is 4000 ppm or higher, a fuel injector may have a sealing problem.
      
   2. *: From step 73, perform fuel system troubleshooting C (steps 74 to 79).
      

B	Go to step 73

A
REPLACE FUEL INJECTOR ASSEMBLY (COROLLA_ZRE142 RM000001EDS05LX.html)

41.INSPECT SPARK PLUG

1. Inspect the spark plugs (COROLLA_ZRE142 RM000001QVP061X_01_0003.html).
   

   HINT:

   Even if the spark plug of only one cylinder is malfunctioning, replace the spark plugs of all cylinders.

NG	REPLACE SPARK PLUG (COROLLA_ZRE142 RM00000304Q017X.html)

OK

42.READ VALUE USING TECHSTREAM (ENGINE SPEED)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.
   

5. Start the engine.
   

6. While running the engine, read the Engine Speed value.
   

   Standard:

   A value that matches the actual engine speed is constantly output.
   

   HINT:

   1. Check the engine speed using a line graph.
      
   2. If the engine cannot be started, check the engine speed while cranking the engine.
      
   3. If the engine speed is 0 rpm, the crankshaft position sensor may have an open or short circuit.
      

NG	CHECK CRANKSHAFT POSITION SENSOR CIRCUIT (COROLLA_ZRE142 RM000000TCW0SCX.html)

OK

43.CHECK IGNITION COIL ASSEMBLY (POWER SOURCE VOLTAGE)

1. Disconnect the ignition coil connector.
   

2. Turn the ignition switch to ON.
   

3. Measure the voltage according to the value(s) in the table below.
   

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   B26-1 (+B) - B26-4 (GND)	Ignition switch ON	11 to 14 V
   B27-1 (+B) - B27-4 (GND)	Ignition switch ON	11 to 14 V
   B28-1 (+B) - B28-4 (GND)	Ignition switch ON	11 to 14 V
   B29-1 (+B) - B29-4 (GND)	Ignition switch ON	11 to 14 V

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      
   3. When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear the DTCs (COROLLA_ZRE142 RM000000PDK0ZAX.html).
      

4. Reconnect the ignition coil connector.
   

NG	CHECK POWER SOURCE CIRCUIT (COROLLA_ZRE142 RM000000XH40QYX.html)

OK

44.CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM)

1. Disconnect the ignition coil connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B26-2 (IGF) - B31-82 (IGF1)	Always	Below 1 Ω
   B27-2 (IGF) - B31-82 (IGF1)	Always	Below 1 Ω
   B28-2 (IGF) - B31-82 (IGF1)	Always	Below 1 Ω
   B29-2 (IGF) - B31-82 (IGF1)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B26-2 (IGF) or B31-82 (IGF1) - Body ground	Always	10 kΩ or higher
   B27-2 (IGF) or B31-82 (IGF1) - Body ground	Always	10 kΩ or higher
   B28-2 (IGF) or B31-82 (IGF1) - Body ground	Always	10 kΩ or higher
   B29-2 (IGF) or B31-82 (IGF1) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the ignition coil connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

45.CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM)

1. Disconnect the ignition coil connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B26-3 (IGT1) - B31-109 (IGT1)	Always	Below 1 Ω
   B27-3 (IGT2) - B31-108 (IGT2)	Always	Below 1 Ω
   B28-3 (IGT3) - B31-107 (IGT3)	Always	Below 1 Ω
   B29-3 (IGT4) - B31-106 (IGT4)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B26-3 (IGT1) or B31-109 (IGT1) - Body ground	Always	10 kΩ or higher
   B27-3 (IGT2) or B31-108 (IGT2) - Body ground	Always	10 kΩ or higher
   B28-3 (IGT3) or B31-107 (IGT3) - Body ground	Always	10 kΩ or higher
   B29-3 (IGT4) or B31-106 (IGT4) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      
   3. If the wire harness is normal, after replacing the ignition coil, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 73 and perform troubleshooting for the ignition system (steps 80 to 88).
      

4. Reconnect the ECM connector.
   

5. Reconnect the ignition coil connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE IGNITION COIL (COROLLA_ZRE142 RM00000304Q017X.html)

46.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
   

5. When performing the Active Test, check for an operating sound from the fuel pump.
   
   

   Standard:

   
   

   Techstream Operation	Specified Condition
   ON	Operating sound heard
   OFF	Operating sound not heard

   HINT:

   Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

NG	CHECK FUEL PUMP CONTROL CIRCUIT (COROLLA_ZRE142 RM0000027680A7X.html)

OK

47.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
   

5. When performing the Active Test, check for fuel leakage from the fuel pipes.
   
   

   Result:

   
   

   Result	Proceed to
   Fuel leakage or signs of fuel leakage are present	A
   No fuel leakage or signs of fuel leakage	B

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.
      
   3. If there are no fuel leaks, after inspecting the fuel pump control system, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 73 and perform fuel system troubleshooting (steps 74 to 79).
      

B	CHECK FUEL PUMP CONTROL CIRCUIT (COROLLA_ZRE142 RM0000027680A7X.html)

A
REPAIR OR REPLACE HARNESS OR CONNECTOR

48.READ VALUE USING TECHSTREAM (ENGINE SPEED)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.
   

5. Start the engine.
   

6. While running the engine, read the Engine Speed value.
   

   Standard:

   A value that matches the actual engine speed is constantly output.
   

   HINT:

   1. Check the engine speed using a line graph.
      
   2. If the engine cannot be started, check the engine speed while cranking the engine.
      
   3. If the engine speed is 0 rpm, the crankshaft position sensor may have an open or short circuit.
      

NG	REPLACE CRANKSHAFT POSITION SENSOR (COROLLA_ZRE142 RM0000030L2013X.html)

OK

49.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)

1. Disconnect the fuel injector assembly connector.
   

2. Turn the ignition switch to ON.
   

3. Measure the voltage according to the value(s) in the table below.
   

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   B9-1 - Body ground	Ignition switch ON	11 to 14 V
   B10-1 - Body ground	Ignition switch ON	11 to 14 V
   B11-1 - Body ground	Ignition switch ON	11 to 14 V
   B12-1 - Body ground	Ignition switch ON	11 to 14 V

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the fuel injector assembly connector.
   

NG	CHECK FUEL INJECTOR CIRCUIT (COROLLA_ZRE142 RM000000ZRM0FVX.html)

OK

50.CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

1. Disconnect the fuel injector assembly connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B9-2 - B31-86 (#10)	Always	Below 1 Ω
   B10-2 - B31-85 (#20)	Always	Below 1 Ω
   B11-2 - B31-84 (#30)	Always	Below 1 Ω
   B12-2 - B31-83 (#40)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B9-2 or B31-86 (#10) - Body ground	Always	10 kΩ or higher
   B10-2 or B31-85 (#20) - Body ground	Always	10 kΩ or higher
   B11-2 or B31-84 (#30) - Body ground	Always	10 kΩ or higher
   B12-2 or B31-83 (#40) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the fuel injector assembly connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

51.INSPECT MASS AIR FLOW METER

1. Inspect the mass air flow meter sub-assembly (COROLLA_ZRE142 RM000001D0M022X.html).
   

NG	Go to step 57

OK

52.CHECK INTAKE SYSTEM

1. Check for air suction in the intake system [vacuum hose disconnection, cracks, damaged gaskets, etc.] (COROLLA_ZRE142 RM000003410016X.html).
   

   HINT:

   1. If the accelerator pedal is released after racing the engine, the inspection is easier to perform because the vacuum inside the intake manifold increases and the air suction noise becomes louder.
      
   2. If Short FT #1 and Long FT #1 are largely different from the normal values when idling (intake air volume is small) and almost the same as the normal values when racing the engine (intake air volume is high), air leakage may be present.
      

   Standard:

   There is no air suction.
   

NG	REPAIR OR REPLACE INTAKE SYSTEM

OK

53.CHECK THROTTLE BODY

1. Disconnect the throttle body connector.
   

   HINT:

   When the connector is disconnected, the vehicle enters fail-safe mode and the throttle valve opening angle is 4 to 7°.

2. Crank the engine and check that it starts.
   
   

   Result:

   
   

   Result	Proceed to
   Engine starts	A
   Engine does not start	B

3. Connect the throttle body connector.
   

   HINT:

   When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear the DTCs (COROLLA_ZRE142 RM000000PDK0ZAX.html).

B	Go to step 55

A

54.CHECK THROTTLE BODY

1. Check if carbon is in the air flow passage.
   

   Standard:

   No carbon present.
   

NG	REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY

OK

55.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT LINEAR)

1. Connect the Techstream to the DLC3.
   

2. Start the engine.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT Linear (Bank 1).
   

   HINT:

   When performing the Active Test, make sure the A/C is on and the shift lever is in neutral.

5. Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream.
   

   OK:

   Techstream Operation	Specified Condition
   0%	Normal engine speed
   100%	Engine idles roughly or stalls

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. When the results of the inspection using the Active Test are normal but the valve operating noise is abnormal, check the valve for any signs of problems.
      
   3. If the camshaft timing oil control valve is stuck on, the valve overlap increases and combustion worsens due to the internal EGR which may cause rough idle or cause the engine to stall.
      

NG	REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (COROLLA_ZRE142 RM000003D3E00WX.html)

OK

56.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT EXHAUST LINEAR)

1. Connect the Techstream to the DLC3.
   

2. Start the engine.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT Exhaust Linear (Bank 1).
   

5. Check the engine speed while operating the oil control valve using the Techstream.
   
   

   OK*:

   
   

   Techstream Operation	Specified Condition
   0%	Normal engine speed
   100%	Engine idles roughly or stalls

   
   

   Result:

   
   

   Result	Proceed to
   NG	A
   OK	B

   HINT:

   1. *: From step 73, perform intake system troubleshooting (steps 89 to 91). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 92 to 99).
      
   2. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   3. When the results of the inspection using the Active Test are normal but the valve operating noise is abnormal, check the valve for any signs of problems.
      
   4. If the camshaft timing oil control valve is stuck on, the valve overlap increases and combustion worsens due to the internal EGR which may cause rough idle or cause the engine to stall.
      

B	Go to step 73

A
REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (COROLLA_ZRE142 RM000003D3E00WX.html)

57.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

1. Disconnect the mass air flow meter sub-assembly connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B2-5 (VG) - B31-69 (VG)	Always	Below 1 Ω
   B2-4 (E2G) - B31-92 (E2G)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B2-5 (VG) or B31-69 (VG) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      
   3. If the wire harness is normal, after replacing the mass air flow meter sub-assembly, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 73 and perform intake system troubleshooting (steps 89 to 91). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 92 to 99).
      

4. Reconnect the ECM connector.
   

5. Reconnect the mass air flow meter sub-assembly connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE MASS AIR FLOW METER (COROLLA_ZRE142 RM0000030K7015X.html)

58.INSPECT ENGINE COOLANT TEMPERATURE SENSOR

1. Inspect the engine coolant temperature sensor (COROLLA_ZRE142 RM000001DBF02MX.html).
   

   HINT:

   If the engine coolant temperature sensor is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 73 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.

NG	REPLACE ENGINE COOLANT TEMPERATURE SENSOR (COROLLA_ZRE142 RM0000030LG014X.html)

OK

59.CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

1. Disconnect the engine coolant temperature sensor connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B58-2 - B31-64 (THW)	Always	Below 1 Ω
   B58-1 - B31-65 (ETHW)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B58-2 or B31-64 (THW) - Body ground	Always	10 kΩ or higher
   B58-1 or B31-65 (ETHW) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      
   3. If the wire harness or connector is malfunctioning, after replacing or repairing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 73 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.
      

4. Reconnect the ECM connector.
   

5. Reconnect the engine coolant temperature sensor connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

60.INSPECT MASS AIR FLOW METER

1. Inspect the mass air flow meter sub-assembly (COROLLA_ZRE142 RM000002W8701JX.html).
   

   HINT:

   If the mass air flow meter sub-assembly is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 73 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.

NG	REPLACE MASS AIR FLOW METER (COROLLA_ZRE142 RM0000030K7015X.html)

OK

61.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

1. Disconnect the mass air flow meter sub-assembly connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B2-5 (VG) - B31-69 (VG)	Always	Below 1 Ω
   B2-4 (E2G) - B31-92 (E2G)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B2-5 (VG) or B31-69 (VG) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      
   3. If the wire harness or connector is malfunctioning, after replacing or repairing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 73 and perform fuel system troubleshooting A (steps 100 to 107, fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113 and ignition system troubleshooting (steps 114 to 122), in that order.
      

4. Reconnect the ECM connector.
   

5. Reconnect the mass air flow meter sub-assembly connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

62.READ VALUE USING TECHSTREAM

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / Atmosphere Pressure and Long FT #1.
   

5. Read the value.
   
   

   Result:

   
   

   Data List Item	Result	Suspected Area	Proceed to
   Long FT #1	+25% or more or less than -25%	Air fuel ratio sensor Heated oxygen sensor Mass air flow meter sub-assembly Fuel injector assembly ECM	A
   Atmosphere Pressure	80 kPa (600 mmHg) or less (when altitude is 0 m)
   Both Data List items listed above	Values are other than above	-	B

B	Go to step 67

A

63.PERFORM SIMULATION TEST

1. Remove the EFI MAIN and ETCS fuses from the engine room relay block.
   

2. After 60 seconds or more elapse, install the EFI MAIN and ETCS fuses.
   

3. Check if the engine can be started.
   
   

   Result:

   
   

   Result	Proceed to
   Engine can be started	A
   Engine cannot be started	B

B	Go to step 67

A

64.INSPECT AIR FUEL RATIO SENSOR

1. Connect the Techstream to the DLC3.
   

2. Start the engine, turn off all accessory switches and warm up the engine until the engine coolant temperature stabilizes.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel System Status #1.
   

5. Confirm that Fuel System Status #1 is CL.
   

6. Enter the following menus: Powertrain / Engine and ECT / Data List / AF Lambda B1S1.
   

7. Confirm that AF Lambda B1S1 is within the range of 0.95 to 1.05 when idling.
   

8. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / All Data / AFS Voltage B1S1 and O2S B1S2.
   

9. Read the output voltage from the air fuel ratio sensor when increasing and decreasing the fuel injection volume.
   

   Standard:

   Techstream Display	Injection Volume	Specified Condition
   AFS Voltage B1S1	12%	Air fuel ratio sensor output voltage is below 3.1 V
   	-12%	Air fuel ratio sensor output voltage is higher than 3.4 V

   HINT:

   1. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
      
   2. If there is almost no response from the air fuel ratio sensor, a malfunction of the air fuel ratio sensor is suspected.
      
   3. If the air fuel ratio sensor is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 73 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.
      

NG	REPLACE AIR FUEL RATIO SENSOR (COROLLA_ZRE142 RM00000306S01AX.html)

OK

65.INSPECT HEATED OXYGEN SENSOR

1. Inspect the heated oxygen sensor (COROLLA_ZRE142 RM000001CK804AX.html).
   

   HINT:

   If the heated oxygen sensor is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 73 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.

NG	REPLACE HEATED OXYGEN SENSOR (COROLLA_ZRE142 RM00000306V015X.html)

OK

66.PERFORM SIMULATION TEST

1. Check if the idling speed is stable after starting the engine.
   

   OK:

   Idling speed is stable.
   

   HINT:

   After replacing the fuel injector assembly or mass air flow meter sub-assembly, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 73 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.

NG	REPLACE FUEL INJECTOR ASSEMBLY (COROLLA_ZRE142 RM000001EDS05LX.html)

OK
REPLACE MASS AIR FLOW METER (COROLLA_ZRE142 RM0000030K7015X.html)

67.CHECK FUEL PRESSURE

1. Inspect the fuel pressure (COROLLA_ZRE142 RM000001IQZ09UX_01_0002.html).
   

NG	Go to step 72

OK

68.INSPECT SPARK PLUG

1. Inspect the spark plugs (COROLLA_ZRE142 RM000001QVP061X_01_0003.html).
   
   

   Result:

   
   

   Result	Proceed to
   All cylinders are normal	A
   One cylinder is abnormal*1	B
   All cylinders are abnormal*2, *3	C

HINT:

1. *1: If one cylinder is abnormal, replace the spark plug of that cylinder and inspect the ignition and fuel system for that cylinder. After performing repairs, check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 73 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.
   
2. *2: If all cylinders are abnormal, replace the spark plugs of all cylinders and check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 73 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.
   
3. *3: Engine starting trouble may occur if the vehicle is driven extremely short distances repeatedly.
   

B	REPLACE SPARK PLUG (ABNORMAL CYLINDER) (COROLLA_ZRE142 RM00000304Q017X.html)
C	REPLACE SPARK PLUG (ALL CYLINDER) (COROLLA_ZRE142 RM00000304Q017X.html)

A

69.CONFIRM VEHICLE CONDITION

1. Confirm the conditions present when the malfunction occurred based on the customer problem analysis.
   
   

   Result:

   
   

   Problem Symptom	Suspected Area	Proceed to
   When the engine is stopped and a long time has passed, engine starting trouble occurs*1	Pressure regulator is stuck open	A
   When the engine is stopped and approximately 15 to 120 minutes have passed, engine starting trouble occurs*2	Fuel injector leak	B
   When the engine is stopped and approximately 2 to 3 minutes have passed, engine starting trouble occurs*3	Failure to maintain fuel pressure by pressure regulator	A
   Condition other than above, or there is an inconsistency in the conditions present when engine starting trouble occurs	-	C*4

   HINT:

   *1: The pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

   *2: Fuel may be leaking from a fuel injector assembly.

   *3: The pressure regulator may not be able to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

   *4: From step 73, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.

B	Go to step 71
C	Go to step 73

A

70.CHECK FUEL PRESSURE

HINT:

For the fuel pressure inspection, refer to the following procedures (COROLLA_ZRE142 RM000001IQZ09UX_01_0002.html).

1. Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.
   
   

   Result:

   
   

   Result	Proceed to
   Less than 147 kPa (1.5 kgf/cm2) (5 minutes after stopping the engine)	A
   147 kPa (1.5 kgf/cm2) or higher (5 minutes after stopping the engine)	B*

   HINT:

   1. If the engine cannot be started, check the fuel pressure after cranking the engine.
      
   2. *: From step 73, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.
      

B	Go to step 73

A
REPLACE PRESSURE REGULATOR (COROLLA_ZRE142 RM000002YQ405DX.html)

71.CHECK FUEL INJECTOR ASSEMBLY

1. Clean the inside of the surge tank with compressed air.
   

2. After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes.
   
   

   Result:

   
   

   Result	Proceed to
   4000 ppm or higher	A
   Less than 4000 ppm	B*

   HINT:

   1. If the concentration is 4000 ppm or higher, a fuel injector may have a sealing problem.
      
   2. *: From step 73, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.
      

B	Go to step 73

A
REPLACE FUEL INJECTOR ASSEMBLY (COROLLA_ZRE142 RM000001EDS05LX.html)

72.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
   

5. When performing the Active Test, check for fuel leakage from the fuel pipes.
   
   

   Result:

   
   

   Result	Proceed to
   Fuel leakage or signs of fuel leakage are present	A
   No fuel leakage or signs of fuel leakage	B

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.
      
   3. If there are no fuel leaks, after inspecting the fuel pump control system, check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 73 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.
      

B	CHECK FUEL PUMP CONTROL CIRCUIT (COROLLA_ZRE142 RM0000027680A7X.html)

A
REPAIR OR REPLACE FUEL LINE

73.CHECK MALFUNCTION CONDITION

1. If the malfunction could not be identified during the inspection in steps 38, 39, 40 and 47, perform fuel system troubleshooting C (steps 74 to 79).
   
   

   Result:

   
   

   Performed Step	Troubleshooting by System	Procedure	Proceed to
   Steps 38, 39, 40 and 47	Fuel system troubleshooting C	74 to 79	A

2. If the malfunction could not be identified during the inspection in step 45, perform ignition system troubleshooting (steps 80 to 88).
   
   

   Result:

   
   

   Performed Step	Troubleshooting by System	Procedure	Proceed to
   Step 45	Ignition system troubleshooting	80 to 88	B

3. If the malfunction could not be identified during the inspection in steps 55, 56 and 57, perform intake air system troubleshooting (steps 89 to 91). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 92 to 99).
   
   

   Result:

   
   

   Performed Step	Troubleshooting by System	Procedure	Proceed to
   Step 55, 56, 57	Intake air system troubleshooting	89 to 91	C
   	Fuel system troubleshooting A	92 to 99

4. If the malfunction could not be identified during the inspection in steps 58, 59, 60, 61, 64, 65, 66, 68, 69, 70, 71, 72, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake air system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 122), in that order.
   
   

   Result:

   
   

   Performed Step	Troubleshooting by System	Procedure	Proceed to
   Steps 58, 59, 60, 61, 64, 65, 66, 68, 69, 70, 71, 72	Fuel system troubleshooting A	100 to 107	D
   	Fuel system troubleshooting B	108 to 110
   	Intake air system troubleshooting	111 to 113
   	Ignition system troubleshooting	114 to 122

B	Go to step 80
C	Go to step 89
D	Go to step 100

A

74.INSPECT FUEL INJECTOR ASSEMBLY

1. Inspect the fuel injectors assembly (COROLLA_ZRE142 RM000001EDQ04ZX.html).
   

NG	REPLACE FUEL INJECTOR ASSEMBLY (COROLLA_ZRE142 RM000001EDS05LX.html)

OK

75.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)

1. Disconnect the fuel injector assembly connector.
   

2. Turn the ignition switch to ON.
   

3. Measure the voltage according to the value(s) in the table below.
   

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   B9-1 - Body ground	Ignition switch ON	11 to 14 V
   B10-1 - Body ground	Ignition switch ON	11 to 14 V
   B11-1 - Body ground	Ignition switch ON	11 to 14 V
   B12-1 - Body ground	Ignition switch ON	11 to 14 V

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the fuel injector assembly connector.
   

NG	CHECK FUEL INJECTOR CIRCUIT (COROLLA_ZRE142 RM000000ZRM0FVX.html)

OK

76.CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

1. Disconnect the fuel injector assembly connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B9-2 - B31-86 (#10)	Always	Below 1 Ω
   B10-2 - B31-85 (#20)	Always	Below 1 Ω
   B11-2 - B31-84 (#30)	Always	Below 1 Ω
   B12-2 - B31-83 (#40)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B9-2 or B31-86 (#10) - Body ground	Always	10 kΩ or higher
   B10-2 or B31-85 (#20) - Body ground	Always	10 kΩ or higher
   B11-2 or B31-84 (#30) - Body ground	Always	10 kΩ or higher
   B12-2 or B31-83 (#40) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the fuel injector assembly connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

77.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (COROLLA_ZRE142 RM0000030L2013X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	Go to step 78

OK
END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

78.CHECK CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)

1. Replace the camshaft position sensor (for intake camshaft) (COROLLA_ZRE142 RM0000030KZ017X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	Go to step 79

OK
END (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) WAS DEFECTIVE)

79.CHECK CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT)

1. Replace the camshaft position sensor (for exhaust camshaft) (COROLLA_ZRE142 RM0000030KZ017X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

OK
END (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) IS DEFECTIVE)

80.CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

1. Check the tightening and installation condition of the crankshaft position sensor bolt.
   

2. Check the connection of the crankshaft position sensor connector.
   

   OK:

   Sensor is installed correctly.
   

NG	SECURELY REINSTALL CRANKSHAFT POSITION SENSOR (COROLLA_ZRE142 RM0000030L0014X.html)

OK

81.CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT))

1. Check the tightening and installation condition of the camshaft position sensor (for intake camshaft) bolt.
   

2. Check the connection of the camshaft position sensor (for intake camshaft) connector.
   

   OK:

   Sensor is installed correctly.
   

NG	SECURELY REINSTALL CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) (COROLLA_ZRE142 RM0000030KX018X.html)

OK

82.CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT))

1. Check the tightening and installation condition of the camshaft position sensor (for exhaust camshaft) bolt.
   

2. Check the connection of the camshaft position sensor (for exhaust camshaft) connector.
   

   OK:

   Sensor is installed correctly.
   

NG	SECURELY REINSTALL CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) (COROLLA_ZRE142 RM0000030KX018X.html)

OK

83.CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

1. Disconnect the crankshaft position sensor connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B13-1 - B31-93 (NE+)	Always	Below 1 Ω
   B13-2 - B31-117 (NE-)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B13-1 or B31-93 (NE+) - Body ground	Always	10 kΩ or higher
   B13-2 or B31-117 (NE-) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the crankshaft position sensor connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

84.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - ECM)

1. Disconnect the camshaft position sensor (for intake camshaft) connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B21-1 (VVI+) - B31-94 (G2+)	Always	Below 1 Ω
   B21-2 (VVI-) - B31-118 (G2-)	Always	Below 1 Ω
   B21-3 (VC) - B31-119 (VCV1)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B21-1 (VVI+) or B31-94 (G2+) - Body ground	Always	10 kΩ or higher
   B21-2 (VVI-) or B31-118 (G2-) - Body ground	Always	10 kΩ or higher
   B21-3 (VC) or B31-119 (VCV1) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunction that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the camshaft position sensor (for intake camshaft) connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

85.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) - ECM)

1. Disconnect the camshaft position sensor (for exhaust camshaft) connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B20-1 (VVE+) - B31-98 (EV1+)	Always	Below 1 Ω
   B20-2 (VVE-) - B31-120 (EV1-)	Always	Below 1 Ω
   B20-3 (VC2) - B31-121 (VCE1)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B20-1 (VVE+) or B31-98 (EV1+) - Body ground	Always	10 kΩ or higher
   B20-2 (VVE-) or B31-120 (EV1-) - Body ground	Always	10 kΩ or higher
   B20-3 (VC2) or B31-121 (VCE1) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunction that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the camshaft position sensor (for exhaust camshaft) connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

86.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (COROLLA_ZRE142 RM0000030L2013X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	Go to step 87

OK
END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

87.CHECK CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)

1. Replace the camshaft position sensor (for intake camshaft) (COROLLA_ZRE142 RM0000030KZ017X.html).
   

2. Check the engine start operation.
   

OK:

Malfunction has been repaired successfully.

NG	Go to step 88

OK
END (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) WAS DEFECTIVE)

88.CHECK CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT)

1. Replace the camshaft position sensor (for exhaust camshaft) (COROLLA_ZRE142 RM0000030KZ017X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

OK
END (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) IS DEFECTIVE)

89.READ VALUE USING TECHSTREAM (ISC LEARNING VALUE)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / ISC Learning Value.
   

5. Start the engine and warm it up until the engine coolant temperature stabilizes with the A/C switch and all the accessory switches off.
   
   

   Result:

   
   

   Data List Item	Result	Suspected Area	Proceed to
   ISC Learning Value	(Engine displacement (liters) x 0.9) or more	Valve timing Compression	A
   	Less than (engine displacement (liters) x 0.9)	-	B

B	Go to step 91

A

90.CHECK CYLINDER COMPRESSION PRESSURE

1. Inspect the compression (COROLLA_ZRE142 RM000002ZLZ050X_01_0010.html).
   

NG	REPAIR OR REPLACE ENGINE ASSEMBLY

OK
ADJUST VALVE TIMING (COROLLA_ZRE142 RM000000PDU0PRX_13_0010.html)

91.INSPECT ENGINE COOLANT TEMPERATURE SENSOR

1. Inspect the engine coolant temperature sensor (COROLLA_ZRE142 RM000001DBF02MX.html).
   

NG	REPLACE ENGINE COOLANT TEMPERATURE SENSOR (COROLLA_ZRE142 RM0000030LG014X.html)

OK

92.CHECK FUEL PRESSURE

HINT:

For the fuel pressure inspection, refer to the following procedures (COROLLA_ZRE142 RM000001IQZ09UX_01_0002.html).

1. Attach a fuel pressure gauge and check the fuel pressure when cranking the engine and after stopping the engine.
   
   

   Result:

   
   

   Vehicle State	Specified Condition
   Cranking engine	304 to 343 kPa (3.1 to 3.5 kgf/cm2)
   5 minutes after stopping engine	147 kPa (1.5 kgf/cm2) or more

NG	Go to step 98

OK

93.READ VALUE USING TECHSTREAM (LONG FT #1)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / Long FT #1.
   
   

   Result:

   
   

   Data List Item	Result	Suspected Area	Proceed to
   Long FT #1	-15 to +15%	Wire harness or connector Fuel	A
   	+15% or more, or less than -15%	Fuel injector assembly	B

B	REPLACE FUEL INJECTOR ASSEMBLY (COROLLA_ZRE142 RM000001EDS05LX.html)

A

94.PERFORM SIMULATION TEST

1. Check if the idling speed after starting the engine is currently stable and has always been stable in the past.
   
   

   Result:

   
   

   Problem Symptom	Suspected Area	Proceed to
   Current unstable idling speed or history of unstable idling speed	Crankshaft position sensor system	A
   All current and past idling speeds are stable	Fuel	B

   HINT:

   Through the customer problem analysis, confirm the fuel being used and the location at which the fuel was added to check if the malfunction is caused by the fuel in the vehicle.

B	REPLACE FUEL

A

95.CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

1. Check the tightening and installation condition of the crankshaft position sensor bolt.
   

2. Check the connection of the crankshaft position sensor connector.
   

   OK:

   Sensor is installed correctly.
   

NG	SECURELY REINSTALL CRANKSHAFT POSITION SENSOR (COROLLA_ZRE142 RM0000030L0014X.html)

OK

96.CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

1. Disconnect the crankshaft position sensor connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B13-1 - B31-93 (NE+)	Always	Below 1 Ω
   B13-2 - B31-117 (NE-)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B13-1 or B31-93 (NE+) - Body ground	Always	10 kΩ or higher
   B13-2 or B31-117 (NE-) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the crankshaft position sensor connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

97.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (COROLLA_ZRE142 RM0000030L2013X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

OK
END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

98.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
   

4. When performing the Active Test, check for fuel leakage from the fuel pipes.
   
   

   Result:

   
   

   Result	Proceed to
   Fuel leakage or signs of fuel leakage are present	A
   No fuel leakage or signs of fuel leakage	B

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. When performing the Active Test, if there is no operating noise from the fuel pump, the fuel pump system may be malfunctioning.
      
   3. Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.
      

B	Go to step 99

A
REPAIR OR REPLACE HARNESS OR CONNECTOR

99.INSPECT FUEL PUMP

1. Inspect fuel pump (COROLLA_ZRE142 RM0000022XV036X.html).
   

HINT:

1. Make sure there is no foreign matter such as iron particles on the fuel pump and no signs that the fuel pump was stuck.
   
2. Make sure the internal connector is securely connected.
   
3. Make sure the fuel pump filter is not clogged.
   

NG	REPLACE FUEL PUMP (COROLLA_ZRE142 RM0000022XX05ZX.html)

OK
REPLACE PRESSURE REGULATOR (COROLLA_ZRE142 RM000002YQ405DX.html)

100.CHECK FUEL PRESSURE

HINT:

For the fuel pressure inspection, refer to the following procedures (COROLLA_ZRE142 RM000001IQZ09UX_01_0002.html).

1. Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.
   
   

   Result:

   
   

   Result	Proceed to
   147 kPa (1.5 kgf/cm2) or higher (5 minutes after stopping the engine)	A
   Less than 147 kPa (1.5 kgf/cm2) (5 minutes after stopping the engine)	B

B	Go to step 106

A

101.READ VALUE USING TECHSTREAM (LONG FT #1)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / Long FT #1.
   
   

   Result:

   
   

   Data List Item	Result	Suspected Area	Proceed to
   Long FT #1	-15 to +15%	Wire harness or connector Fuel	A
   	+15% or more, or less than -15%	Fuel injector assembly	B

B	REPLACE FUEL INJECTOR ASSEMBLY (COROLLA_ZRE142 RM000001EDS05LX.html)

A

102.PERFORM SIMULATION TEST

1. Check if the idling speed after starting the engine is currently stable and has always been stable in the past.
   
   

   Result:

   
   

   Problem Symptom	Suspected Area	Proceed to
   Current unstable idling speed or history of unstable idling speed	Crankshaft position sensor system	A
   All current and past idling speeds are stable	Fuel	B

   HINT:

   Through the customer problem analysis, confirm the fuel being used and the location at which the fuel was added to check if the malfunction is caused by the fuel in the vehicle.

B	REPLACE FUEL

A

103.CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

1. Check the tightening and installation condition of the crankshaft position sensor bolt.
   

2. Check the connection of the crankshaft position sensor connector.
   

   OK:

   Sensor is installed correctly.
   

NG	SECURELY REINSTALL CRANKSHAFT POSITION SENSOR (COROLLA_ZRE142 RM0000030L0014X.html)

OK

104.CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

1. Disconnect the crankshaft position sensor connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B13-1 - B31-93 (NE+)	Always	Below 1 Ω
   B13-2 - B31-117 (NE-)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B13-1 or B31-93 (NE+) - Body ground	Always	10 kΩ or higher
   B13-2 or B31-117 (NE-) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the crankshaft position sensor connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

105.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (COROLLA_ZRE142 RM0000030L2013X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

OK
END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

106.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
   

5. When performing the Active Test, check for fuel leakage from the fuel pipes.
   
   

   Result:

   
   

   Result	Proceed to
   Fuel leakage or signs of fuel leakage are present	A
   No fuel leakage or signs of fuel leakage	B

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. When performing the Active Test, if there is no operating noise from the fuel pump, the fuel pump system may be malfunctioning.
      
   3. Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.
      

B	Go to step 107

A
REPAIR OR REPLACE HARNESS OR CONNECTOR

107.INSPECT FUEL PUMP

1. Inspect fuel pump (COROLLA_ZRE142 RM0000022XV036X.html).
   

HINT:

1. Make sure there is no foreign matter such as iron particles on the fuel pump and no signs that the fuel pump was stuck.
   
2. Make sure the internal connector is securely connected.
   
3. Make sure the fuel pump filter is not clogged.
   

NG	REPLACE FUEL PUMP (COROLLA_ZRE142 RM0000022XX05ZX.html)

OK

108.CHECK PURGE VSV

1. Disconnect the vacuum hose (on the canister side) of the purge VSV.
   

2. Start the engine.
   

3. Idle the engine.
   

4. Disconnect the purge VSV connector.
   

5. Check if air flows through the purge VSV.
   

   Standard:

   Air does not flow.
   

6. Reconnect the purge VSV connector.
   

7. Reconnect the vacuum hose.
   

   HINT:

   When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear the DTCs (COROLLA_ZRE142 RM000000PDK0ZAX.html).

NG	INSPECT PURGE VSV (COROLLA_ZRE142 RM000000R35032X.html)

OK

109.CHECK FUEL INJECTOR ASSEMBLY

1. Clean the inside of the surge tank with compressed air.
   

2. After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes.
   
   

   Result:

   
   

   Result	Proceed to
   4000 ppm or higher	A
   Less than 4000 ppm	B

   HINT:

   If the concentration is 4000 ppm or higher, a fuel injector may have a sealing problem.

B	Go to step 110

A
REPLACE FUEL INJECTOR ASSEMBLY (COROLLA_ZRE142 RM000001EDS05LX.html)

110.CHECK INTAKE VALVE

1. Check if carbon is on the intake valves.
   
   

   Result:

   
   

   Result	Proceed to
   Carbon is present	A
   No carbon is present	B

B	Go to step 111

A
CLEAN INTAKE VALVE

111.READ VALUE USING TECHSTREAM (ISC LEARNING VALUE)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / ISC Learning Value.
   

5. Start the engine, turn off all accessory switches and warm up the engine until the engine coolant temperature stabilizes.
   
   

   Result:

   
   

   Data List Item	Result	Suspected Area	Proceed to
   ISC Learning Value	(engine displacement (liters) x 0.9) or more	Valve timing Compression	A
   	Less than (engine displacement (liters) x 0.9)	-	B

B	Go to step 113

A

112.CHECK CYLINDER COMPRESSION PRESSURE

1. Inspect the compression (COROLLA_ZRE142 RM000002ZLZ050X_01_0010.html).
   

NG	REPAIR OR REPLACE ENGINE ASSEMBLY

OK
ADJUST VALVE TIMING (COROLLA_ZRE142 RM000000PDU0PRX_13_0010.html)

113.INSPECT ENGINE COOLANT TEMPERATURE SENSOR

1. Inspect the engine coolant temperature sensor (COROLLA_ZRE142 RM000001DBF02MX.html).
   

NG	REPLACE ENGINE COOLANT TEMPERATURE SENSOR (COROLLA_ZRE142 RM0000030LG014X.html)

OK

114.CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

1. Check the tightening and installation condition of the crankshaft position sensor bolt.
   

2. Check the connection of the crankshaft position sensor connector.
   

   OK:

   Sensor is installed correctly.
   

NG	SECURELY REINSTALL CRANKSHAFT POSITION SENSOR (COROLLA_ZRE142 RM0000030L0014X.html)

OK

115.CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT))

1. Check the tightening and installation condition of the camshaft position sensor (for intake camshaft) bolt.
   

2. Check the connection of the camshaft position sensor (for intake camshaft) connector.
   

   OK:

   Sensor is installed correctly.
   

NG	END (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) WAS DEFECTIVE)

OK

116.CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT))

1. Check the tightening and installation condition of the camshaft position sensor (for exhaust camshaft) bolt.
   

2. Check the connection of the camshaft position sensor (for exhaust camshaft) connector.
   

   OK:

   Sensor is installed correctly.
   

NG	END (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) IS DEFECTIVE)

OK

117.CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

1. Disconnect the crankshaft position sensor connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B13-1- B31-93 (NE+)	Always	Below 1 Ω
   B13-2 - B31-117 (NE-)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B13-1 or B31-93 (NE+) - Body ground	Always	10 kΩ or higher
   B13-2 or B31-117 (NE-) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the crankshaft position sensor connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

118.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - ECM)

1. Disconnect the camshaft position sensor (for intake camshaft) connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B21-1 (VVI+) - B31-94 (G2+)	Always	Below 1 Ω
   B21-2 (VVI-) - B31-118 (G2-)	Always	Below 1 Ω
   B21-3 (VC) - B31-119 (VCV1)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B21-1 (VVI+) or B31-94 (G2+) - Body ground	Always	10 kΩ or higher
   B21-2 (VVI-) or B31-118 (G2-) - Body ground	Always	10 kΩ or higher
   B21-3 (VC) or B31-119 (VCV1) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunction that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the camshaft position sensor (for intake camshaft) connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

119.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) - ECM)

1. Disconnect the camshaft position sensor (for exhaust camshaft) connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance (Check for Open):

   
   

   Tester Connection	Condition	Specified Condition
   B20-1 (VVE+) - B31-98 (EV1+)	Always	Below 1 Ω
   B20-2 (VVE-) - B31-120 (EV1-)	Always	Below 1 Ω
   B20-3 (VC2) - B31-121 (VCE1)	Always	Below 1 Ω

   
   

   Standard Resistance (Check for Short):

   
   

   Tester Connection	Condition	Specified Condition
   B20-1 (VVE+) or B31-98 (EV1+) - Body ground	Always	10 kΩ or higher
   B20-2 (VVE-) or B31-120 (EV1-) - Body ground	Always	10 kΩ or higher
   B20-3 (VC2) or B31-121 (VCE1) - Body ground	Always	10 kΩ or higher

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunction that do not always occur.
      
   2. Make sure there is not an excessive amount of force applied to the wire harness.
      

4. Reconnect the ECM connector.
   

5. Reconnect the camshaft position sensor (for exhaust camshaft) connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

120.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (COROLLA_ZRE142 RM0000030L2013X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	Go to step 121

OK
END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

121.CHECK CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)

1. Replace the camshaft position sensor (for intake camshaft) (COROLLA_ZRE142 RM0000030KZ017X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	Go to step 122

OK
END (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) WAS DEFECTIVE)

122.CHECK CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT)

1. Replace the camshaft position sensor (for exhaust camshaft) (COROLLA_ZRE142 RM0000030KZ017X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

OK
END (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) IS DEFECTIVE)