Dtc P1604 Startability Malfunction

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT AND RECORD FREEZE FRAME DATA

CHECK ENGINE IMMOBILISER SYSTEM

CHECK MALFUNCTION CONDITION

READ FREEZE FRAME DATA

READ FREEZE FRAME DATA

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

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 TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

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

INSPECT FUEL INJECTOR ASSEMBLY

INSPECT FUEL INJECTOR ASSEMBLY

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

CHECK INTAKE SYSTEM

PERFORM SIMULATION TEST

CONFIRM PROBLEM SYMPTOM

PERFORM SIMULATION TEST

INSPECT BATTERY

CHECK ENGINE ASSEMBLY

INSPECT STARTER (STARTER PINION GEAR)

INSPECT BATTERY

INSPECT STARTER

PERFORM SIMULATION TEST

INSPECT BATTERY

CHECK ENGINE ASSEMBLY

INSPECT FUEL INJECTOR ASSEMBLY

CHECK FUEL PRESSURE

CHECK SPARK PLUG AND SPARK

CONFIRM VEHICLE CONDITION

CHECK FUEL PRESSURE

INSPECT FUEL INJECTOR ASSEMBLY

INSPECT SPARK PLUG

READ VALUE USING TECHSTREAM (ENGINE SPEED)

CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL NO. 1)

CHECK HARNESS AND CONNECTOR (IGNITION COIL NO. 1 - 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 TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

INSPECT MASS AIR FLOW METER

CHECK INTAKE SYSTEM

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT 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

PERFORM SIMULATION TEST

CHECK FUEL PRESSURE

INSPECT SPARK PLUG

CONFIRM VEHICLE CONDITION

CHECK FUEL PRESSURE

INSPECT FUEL INJECTOR ASSEMBLY

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

CHECK MALFUNCTION CONDITION

INSPECT FUEL INJECTOR ASSEMBLY

CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

CHECK CRANKSHAFT POSITION SENSOR

CHECK CAMSHAFT POSITION SENSOR

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

CHECK CRANKSHAFT POSITION SENSOR

CHECK CAMSHAFT POSITION SENSOR

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)

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

CHECK CRANKSHAFT POSITION SENSOR

CHECK CAMSHAFT POSITION SENSOR

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: The engine speed is below 500 rpm with the STA signal on for a certain amount of time (refer to the illustration below) (1 trip detection logic). After the engine starts (engine speed is 500 rpm or more), the engine speed drops to 200 rpm or less within approximately 2 seconds (1 trip detection logic).	Immobiliser system Engine assembly (excess friction, compression loss) Starter Crankshaft position sensor Camshaft position sensor Engine coolant temperature sensor Fuel pump Fuel pump control circuit Fuel line (fuel filter, pipes and hoses) Fuel injector assembly Throttle with motor body assembly Fuel pressure regulator Battery Drive plate*1 Flywheel*2 Spark plug Ignition coil circuit Intake system Camshaft timing oil control valve Mass air flow meter Air fuel ratio sensor Valve timing Fuel Purge VSV Intake valve ECM

*1: for Automatic Transaxle Models
*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 air induction system during starting difficulty

Freeze Frame Data P1604 Startability Malfunction

Parameter	-3	-2	-1	0	1	Unit
Engine Speed	1497	794	334	249	249	rpm
Calculate Load	34.5	28.2	32.1	87.8	87.4	%
Vehicle Load	8.6	21.9	15.6	7.4	5.8	%
MAF	1.70	2.31	0.70	0.25	0.20	gm/sec
Atmosphere Pressure	-1	-1	-1	-1	-1	psi(gauge)
Coolant Temp	167	167	167	167	167	F
Intake Air	93	93	93	93	93	F
Ambient Temperature	66	66	66	66	66	F
Battery Voltage	13.2	13.0	12.3	12.3	12.3	V
Throttle Sensor Volt %	16.0	17.6	17.2	15.6	15.6	%
Throttle Sensor #2 Volt %	48.2	50.1	49.4	47.8	47.8	%
Throttle Sensor Position	0.0	0.0	0.0	0.0	0.0	%
Throttle Motor DUTY	16.0	17.6	17.6	15.6	15.6	%
Injector (Port)	3204	2562	2562	2562	2562	μs
Injection Volume (Cylinder 1)	0.152	0.152	0.152	0.152	0.152	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 Purge VSV	OFF	OFF	OFF	OFF	OFF
Target Air-Fuel Ratio	0.830	0.841	0.871	0.799	0.799
AF Lambda B1 S1	1.014	1.016	1.021	1.022	1.027
AFS Voltage B1 S1	3.37	3.38	3.40	3.41	3.42	V
O2S B1 S2	0.82	0.31	0.07	0.05	0.03	V
Short FT #1	0.000	0.000	0.000	0.000	0.000	%
Long FT #1	0.000	-4.069	-4.737	-4.737	-4.737	%
Total FT #1	-0.043	-0.043	-0.043	-0.043	-0.043
Fuel System Status #1	OL	OL	OL	OL	OL
IGN Advance	-4.0	2.0	4.0	0.0	0.0	deg
Knock Feedback Value	-3.0	-3.0	-3.0	-3.0	-3.0	CA
Knock Correct Learn Value	14.0	14.0	14.0	14.0	14.0	CA
VVT Control Status #1	OFF	OFF	OFF	OFF	OFF
Starter Signal	Close	Close	Close	Close	Close

WIRING DIAGRAM

Refer to P1603 (YARIS_NCP93 RM00000211409TX_06.html).

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 the DTC can be stored as a result of certain user actions, even if the DTC is output, if the customer makes no mention of problems, clear the DTC 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 (YARIS_NCP93 RM000000PDS0MJX.html).
   
6. When confirming the 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. If the battery voltage fluctuates while cranking the engine, it can be concluded that cranking is being performed. When the engine speed is 0 rpm, the crankshaft position sensor and/or an ECM may be malfunctioning.
         
         
         
         
         
         

   2. All engine speeds recorded in the freeze frame data are between 60 and 250 rpm (the engine cranks but there is no combustion).
      

      HINT:

      If the engine speed is between 60 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 Crankshaft position sensor ECM	4 to 9
   	60 to 250 rpm (engine cranks but no initial combustion*1)	Fuel pump control circuit Ignition system Immobiliser 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 circuit	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
      	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
      	Engine assembly	Engine assembly (excess friction)
      Cranking speed too high	Engine assembly	Engine assembly (compression loss)
      There is no initial combustion	Fuel supply problem	Cannot maintain pressure due to pressure regulator malfunction Fuel injector leak Fuel leak from fuel line Fuel pump control circuit Fuel pump	35 to 48
      	Immobiliser system	Immobiliser system
      	Ignition system malfunction	Spark plug Crankshaft position sensor ignition coil No. 1
      Engine stalls after starter turnoff	Air suction	Intake system connections	49 to 54
      	Deposits in throttle body	Throttle with motor body assembly
      	VVT valve does not return properly	Camshaft timing oil control valve assembly
      	Mass air flow meter malfunction	Mass air flow meter
      The initial combustion and starter turnoff occur late	Engine coolant temperature sensor malfunction	Engine coolant temperature sensor	55 to 68
      	Mass air flow meter malfunction	Mass air flow meter
      	Abnormal A/F learning value	Air fuel ratio sensor
      	Deviation from fuel injection characteristics	Fuel injector assembly
      	Wet-fouled or dry-fouled spark plug	Spark plug
      	Lack of fuel pressure	Pressure regulator Fuel pump Fuel pump control circuit

      *1: for Automatic Transaxle Models
      *2: for Manual Transaxle Models
      

   2. Systems to inspect.
      
      

      Troubleshooting by System	Suspected Area	Suspected Component	Procedure
      Fuel system troubleshooting A	Abnormal A/F learning value	Fuel injector assembly	83 to 90 91 to 98
      	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 assembly	99 to 101
      Fuel system troubleshooting C	Injection signal system malfunction	Fuel injector assembly Crankshaft position sensor Camshaft position sensor ECM	70 to 73
      Air induction system troubleshooting	Difference between ISC target value and opening angle when idling	Engine assembly (compression loss) Valve timing Engine coolant temperature sensor ECM	80 to 82 102 to 104
      Ignition system troubleshooting	Camshaft and/or crankshaft position sensor signal malfunction	Crankshaft position sensor system (including sensor installation) Camshaft position sensor system (including sensor installation) ECM	74 to 79 105 to 110

NOTICE:

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

1.CHECK ANY OTHER DTCS OUTPUT AND RECORD FREEZE FRAME DATA

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

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

4. Read 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 then the DTC is stored.
      

   Result

   Result	Proceed To
   DTC P1604 is output	A
   DTC P1604 and other DTCs are output	B

B	GO TO DTC CHART (YARIS_NCP93 RM000000PDF0E6X.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 / Immobiliser Fuel Cut.
   

5. Read the value displayed on the Techstream.
   

   OK:

   Immobiliser Fuel Cut is OFF
   

   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.

NG	REPAIR ENGINE IMMOBILISER SYSTEM (YARIS_NCP93 RM0000012FI00NX.html)

OK

3.CHECK MALFUNCTION CONDITION

1. Confirm the problem symptoms.
   
   

   Result

   Result	Proceed To
   Freeze frame data exists, but the starting difficulty cannot be reproduced and it is unknown what kind of starting difficulty occurred	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 (YARIS_NCP93 RM000000PDS0MJX.html).
   
   

   Result

   Freeze Frame Data Item		Suspected Area	Proceed To
   Engine Speed	Battery Voltage
   All 5 sets of freeze frame data are 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 ECM	B
   60 to 250 rpm (engine cranks but no initial combustion)	-	Fuel pump control circuit Ignition system Engine coolant temperature sensor Fuel injection system	C
   250 rpm or higher (combustion occurs but initial combustion and starter turnoff occur late)	-	Engine assembly Engine coolant temperature sensor Fuel injection system Fuel pump control circuit	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)
      
   3. Shift SW Status (R, D Range)
      

B	Go to step 5
C	Go to step 10
D	Go to step 15
E	Go to step 49

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 (YARIS_NCP93 RM000000PDS0MJX.html).
   
   

   Result

   Freeze Frame Data Item	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. 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 ASSEMBLY OR BATTERY

A
CHECK CRANKING HOLDING FUNCTION CIRCUIT (YARIS_NCP93 RM000000WZ3082X.html)

6.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 SENSOR (YARIS_NCP93 RM000001DBM00YX.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.
   

NG	REPLACE CRANKSHAFT POSITION SENSOR (YARIS_NCP93 RM000001DBP00YX.html)

OK

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

1. Check the harnesses and connectors, referring to DTC P0335 inspection procedure (YARIS_NCP93 RM000000TCW0MCX_09_0004.html).
   

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.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (YARIS_NCP93 RM000001DBN01PX.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

OK
END (CRANKSHAFT POSITION SENSOR IS DEFECTIVE) (YARIS_NCP93 RM000001DBP00YX.html)

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 (YARIS_NCP93 RM000000PDS0MJX.html).
   
   

   Result

   Freeze Frame Data Item			Suspected Area	Proceed To
   Coolant Temp, Ambient Temperature, Intake Air	Coolant Temp, Ambient Temperature	Fuel Pump/Speed Status
   Difference between Coolant Temp, Ambient Temperature and Intake Air is 10°C (18°F) or more*1	Coolant Temp is 125°C (257°F) or more, or lower than Ambient Temperature by 15°C (27°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 Temperature 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 (YARIS_NCP93 RM000001DN703JX.html)

A
REPLACE ENGINE COOLANT TEMPERATURE SENSOR (YARIS_NCP93 RM000001DBH011X.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. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
   

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   J5-4 - 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.
      

NG	CHECK FUEL PUMP CONTROL CIRCUIT (YARIS_NCP93 RM000001DN703JX.html)

OK

12.CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

1. Check the harnesses and connectors, referring to DTC P0300 inspection procedure (YARIS_NCP93 RM000000XH30M0X_12_0032.html).
   

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.
   

NG	CHECK FUEL INJECTOR CIRCUIT (YARIS_NCP93 RM000000ZRM0BTX.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. 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 14

A
REPAIR OR REPLACE FUEL LINE

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

   HINT:

   If there is foreign matter such as iron particles on the fuel pump, fuel filter or fuel tank, remove the foreign matter.

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 (YARIS_NCP93 RM000000PDS0MJX.html).
   
   

   Result

   Freeze Frame Data Item				Suspected Area	Proceed To
   Coolant Temp, Ambient Temperature, Intake Air	Coolant Temp, Ambient Temperature	Long FT #1	Engine Speed
   Difference between Coolant Temp, Ambient Temperature and Intake Air is 10°C (18°F) or more	Coolant Temp is 125°C (257°F) or more, or lower than Ambient Temperature by 15°C (27°F) or more	-	-	Engine coolant temperature sensor	A
   	Other than above	-15% or less, or +15% or more	-	Fuel pump control circuit Fuel injector assembly	B
   		-15 to +15%	Minimum speed is 300 rpm or more*1	Engine assembly	C
   			Minimum speed is below 300 rpm	Fuel system Intake air system	D
   Difference between Coolant Temp, Ambient Temperature and Intake Air is less than 10°C (18°F)	-	-15% or less, or +15% or more	-	Fuel pump control circuit Fuel injector assembly	B
   		-15 to +15%	Minimum speed is 300 rpm or more*1	Engine assembly	C
   			Minimum speed is below 300 rpm	Fuel system Intake air system	D

   HINT:

   *1: 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 (YARIS_NCP93 RM000001DBH011X.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 (YARIS_NCP93 RM000001EDS04FX.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

   HINT:

   If there is foreign matter such as iron particles on the fuel pump, fuel filter or fuel tank, remove the foreign matter.

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 (YARIS_NCP93 RM000000PDS0MJX.html).
   
   

   Result

   Freeze Frame Data Item	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 assembly.

   *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 (YARIS_NCP93 RM000001EF100YX_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) 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
   Normal	A
   Abnormal	B

A	Go to step 24
B	REPLACE FUEL PRESSURE REGULATOR (YARIS_NCP93 RM000000SL804XX.html)

20.INSPECT 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
   400 ppm or higher	A
   Less than 400 ppm	B

   HINT:

   If the concentration is 400 ppm or higher, a fuel injector assembly may have a sealing problem.

B	Go to step 22

A

21.INSPECT FUEL INJECTOR ASSEMBLY

1. Inspect the fuel injector assembly (YARIS_NCP93 RM000001EDQ046X.html).
   

   Result

   Result	Proceed To
   Abnormal	A
   Normal	B

B	Go to step 22

A
REPLACE FUEL INJECTOR ASSEMBLY (YARIS_NCP93 RM000001EDS04FX.html)

22.INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

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 WITH MOTOR BODY ASSEMBLY (YARIS_NCP93 RM000001CZA012X.html)

23.CHECK INTAKE SYSTEM

1. Check the intake system for vacuum leak (YARIS_NCP93 RM0000032ZM008X.html).
   

   OK:

   No leak in 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.CONFIRM PROBLEM SYMPTOM

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 tooth damage) Starter system Engine assembly (excess friction) Drive plate wear or tooth damage*1 Flywheel wear or tooth damage*2	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)*3	Pressure regulator fuel pressure maintenance Fuel injector leak Fuel leak from fuel line Fuel pump control circuit Fuel pump Spark plug Crankshaft position sensor system Ignition coil system	C
   The engine stalls after starter turnoff (engine stalls immediately after the first time the engine speed increases)*4	Intake system connections Throttle with motor body assembly Camshaft timing oil control valve Mass air flow meter system	D
   The initial combustion and starter turnoff occur late*5	Engine coolant temperature sensor Mass air flow meter Air fuel ratio sensor Heated oxygen sensor Fuel injector assembly Spark plug Pressure regulator Fuel pump Fuel pump control circuit	E

   *1: for Automatic Transaxle Models
   *2: for Manual Transaxle Models
   

   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. *3: If there is no initial combustion, a wire harness may be malfunctioning, or the ignition or fuel system may be malfunctioning.
      
   3. *4: 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. *5: If the initial combustion and starter turnoff occur late, the fuel injection volume may be incorrect (too low or too high).
      

B	Go to step 32
C	Go to step 35
D	Go to step 49
E	Go to step 55

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.*3	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*1 Flywheel*2 Starter	B
   A noise indicating that the starter pinion gear is extending is not heard	Battery Starter Starter system	C

   *1: for Automatic Transaxle Models
   *2: for Manual Transaxle Models
   

   HINT:

   *3: The battery may be fully depleted or there may be excess engine friction.

B	Go to step 29
C	Go to step 30

A

27.INSPECT BATTERY

1. Inspect the battery (YARIS_NCP93 RM000001E2J01FX.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

29.INSPECT STARTER (STARTER PINION GEAR)

1. Remove the starter (except Cold Area) (YARIS_NCP93 RM000001E2702SX.html).
   

2. Remove the starter (for Cold Area) (YARIS_NCP93 RM000001E2702TX.html).
   

3. Check for starter pinion gear for wear and damage.
   

   Standard:

   There is no wear or damage.
   

   Result

   Result	Proceed To
   NG	A
   OK (for Automatic Transaxle Models)	B
   OK (for Manual Transaxle Models)	C

B	REPLACE DRIVE PLATE AND RING GEAR
C	REPLACE FLYWHEEL SUB-ASSEMBLY

A
REPLACE STARTER

30.INSPECT BATTERY

1. Inspect the battery (YARIS_NCP93 RM000001E2J01FX.html).
   

NG	CHARGE OR REPLACE BATTERY

OK

31.INSPECT STARTER

1. Inspect the starter (except Cold Area) (YARIS_NCP93 RM000001E2702SX.html).
   

2. Inspect the starter (for Cold Area) (YARIS_NCP93 RM000001E2702TX.html).
   

NG	REPLACE STARTER

OK
CHECK CRANKING HOLDING FUNCTION CIRCUIT (YARIS_NCP93 RM000000WZ3082X.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 Excess engine friction	A
   Cranking speed is fast (300 rpm or more)*1	Engine compression loss	B

   HINT:

   *1: 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 (YARIS_NCP93 RM000001E2J01FX.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	CHECK AND REPAIR ENGINE ASSEMBLY

OK
INSPECT STARTER

35.INSPECT FUEL INJECTOR ASSEMBLY

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

   OK:

   Fuel injector operating sound is heard.
   

NG	Go to step 47

OK

36.CHECK FUEL PRESSURE

1. Inspect the fuel pressure (YARIS_NCP93 RM000001EF100YX_01_0002.html).
   

NG	Go to step 45

OK

37.CHECK SPARK PLUG AND SPARK

1. Check for sparks (YARIS_NCP93 RM000001EFG05DX.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 69, perform fuel system troubleshooting C (steps 70 to 73).

B	Go to step 40
C	Go to step 69

A

39.CHECK FUEL PRESSURE

HINT:

For the fuel pressure inspection, refer to the following procedures (YARIS_NCP93 RM000001EF100YX_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*1

   HINT:

   1. If the engine cannot be started, check the fuel pressure after cranking the engine.
      
   2. *1: From step 69, perform fuel system troubleshooting C (steps 70 to 73).
      

B	Go to step 69

A
REPLACE FUEL PRESSURE REGULATOR (YARIS_NCP93 RM000000SL804XX.html)

40.INSPECT FUEL INJECTOR ASSEMBLY

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

   Result

   Result	Proceed To
   400 ppm or higher	A
   Less than 400 ppm	B*1

   HINT:

   1. If the concentration is 400 ppm or higher, a fuel injector assembly may have a sealing problem.
      
   2. *1: From step 69, perform fuel system troubleshooting C (steps 70 to 73).
      

B	Go to step 69

A
REPLACE FUEL INJECTOR ASSEMBLY (YARIS_NCP93 RM000001EDS04FX.html)

41.INSPECT SPARK PLUG

1. Inspect the spark plugs (YARIS_NCP93 RM000001EFG05DX_01_0002.html).
   

HINT:

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

NG	REPLACE SPARK PLUG (YARIS_NCP93 RM000001EFJ02JX.html)

OK

42.READ VALUE USING TECHSTREAM (ENGINE SPEED)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

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

4. Start the engine.
   

5. While running the engine, read the value of Engine Speed.
   

   OK:

   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 (YARIS_NCP93 RM000000TCW0MCX_08.html)

OK

43.CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL NO. 1)

1. Check the harnesses and connectors, referring to DTC P0351 inspection procedure (YARIS_NCP93 RM000000XH40L5X_09_0001.html).
   

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.
   

NG	CHECK IGNITION COIL POWER SOURCE CIRCUIT (YARIS_NCP93 RM000000XH40L5X_09_0001.html)

OK

44.CHECK HARNESS AND CONNECTOR (IGNITION COIL NO. 1 - ECM)

1. Check the harnesses and connectors, referring to DTC P0351 inspection procedure (YARIS_NCP93 RM000000XH40L5X_09_0002.html).
   

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 No. 1, check if engine starting trouble occurs again. If engine starting trouble occurs again, Proceed To step 69 and perform troubleshooting for the ignition system (steps 74 to 79).
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE IGNITION COIL NO. 1 (YARIS_NCP93 RM000001EFJ02JX.html)

45.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 an operating sound from the fuel pump.
   

   OK:

   Control the Fuel Pump / Speed	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 (YARIS_NCP93 RM000001DN703JX.html)

OK

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. 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. 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 circuit, check if engine starting trouble occurs again. If engine starting trouble occurs again, Proceed To step 69 and perform fuel system troubleshooting (steps 70 to 73).
      

B	CHECK FUEL PUMP CONTROL CIRCUIT (YARIS_NCP93 RM000001DN703JX.html)

A
REPAIR OR REPLACE FUEL LINE

47.READ VALUE USING TECHSTREAM (ENGINE SPEED)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

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

4. Start the engine.
   

5. While running the engine, read the value of Engine Speed.
   

   OK:

   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 (YARIS_NCP93 RM000001DBP00YX.html)

OK

48.CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

1. Check the harnesses and connectors, referring to DTC P0300 inspection procedure (YARIS_NCP93 RM000000XH30M0X_12_0032.html).
   

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.
   

NG	CHECK FUEL INJECTOR CIRCUIT (YARIS_NCP93 RM000000ZRM0BTX.html)

OK
REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

49.INSPECT MASS AIR FLOW METER

1. Inspect the mass air flow meter (YARIS_NCP93 RM000000WC30I9X_08_0006.html).
   

NG	Go to step 54

OK

50.CHECK INTAKE SYSTEM

1. Check for air leakage in the intake system (vacuum hose disconnection, cracks, damaged gaskets, etc.) (YARIS_NCP93 RM0000032ZM008X.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 (differ by more than 15%) when idling (intake air volume is small) and almost the same as the normal values when racing the engine (for example, when maintaining a speed of 3000 rpm) (intake air volume is high), air leakage may be present.
      

   OK:

   There is no air leakage.
   

NG	REPAIR OR REPLACE INTAKE SYSTEM

OK

51.INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

1. Disconnect the throttle with motor body assembly 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 with motor body assembly connector.
   

   HINT:

   When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear DTCs (YARIS_NCP93 RM000000PDK0QGX.html).

B	Go to step 53

A

52.INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

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

   OK:

   No carbon present.
   

NG	REMOVE FOREIGN OBJECT AND CLEAN THROTTLE WITH MOTOR BODY ASSEMBLY

OK

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

1. Performing the Active Test, referring to DTC P0011 inspection procedure (YARIS_NCP93 RM000000PDU0JZX_09_0002.html).
   

   Result

   Result	Proceed To
   NG	A
   OK	B

   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 assembly is stuck ON, the valve overlap increases and combustion worsens due to the internal EGR which may cause the engine to stall.
      

B	Go to step 69

A
REPLACE CAMSHAFT TIMING OIL CONTROL VALVE (YARIS_NCP93 RM000001D0A011X.html)

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

1. Check the harnesses and connectors, referring to DTC P0100 inspection procedure (YARIS_NCP93 RM000000U5B0ITX_09_0023.html).
   

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, check if engine starting trouble occurs again. If engine starting trouble occurs again, Proceed To step 69 and perform air induction system troubleshooting (steps 80 to 82). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 83 to 90).
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE MASS AIR FLOW METER (YARIS_NCP93 RM000001D0L00WX.html)

55.INSPECT ENGINE COOLANT TEMPERATURE SENSOR

1. Inspect the engine coolant temperature sensor (YARIS_NCP93 RM000001DBF01ZX.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 69 and perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), in that order.

NG	REPLACE ENGINE COOLANT TEMPERATURE SENSOR (YARIS_NCP93 RM000001DBH011X.html)

OK

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

1. Check the harnesses and connectors, referring to DTC P0115 inspection procedure (YARIS_NCP93 RM000000PF50KSX_08.html).
   

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 69 and perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), in that order.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

57.INSPECT MASS AIR FLOW METER

1. Inspect the mass air flow meter (YARIS_NCP93 RM000000WC30I9X_08_0006.html).
   

HINT:

If the mass air flow meter 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 69 and perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), in that order.

NG	REPLACE MASS AIR FLOW METER (YARIS_NCP93 RM000001D0L00WX.html)

OK

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

1. Check the harnesses and connectors, referring to DTC P0100 inspection procedure (YARIS_NCP93 RM000000U5B0ITX_09_0023.html).
   

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 69 and perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), in that order.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

59.READ VALUE USING TECHSTREAM

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

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

   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 Fuel injector assembly ECM	A
   Atmosphere Pressure	80 kPa or less (when altitude is 0 m)
   Both Data List items listed above	Values are other than above	-	B

B	Go to step 63

A

60.PERFORM SIMULATION TEST

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

2. After 60 seconds or more elapse, install the EFI 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 63

A

61.INSPECT AIR FUEL RATIO SENSOR

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 / 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.
   

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

   Result

   Result	Proceed To
   Normal	A
   Abnormal	B

   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 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 69 and perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), in that order.
      

B	REPLACE AIR FUEL RATIO SENSOR (YARIS_NCP93 RM000001CKA00YX.html)

A

62.PERFORM SIMULATION TEST

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

   OK:

   Engine speed is stable.
   

   HINT:

   After replacing the fuel injector assembly or mass air flow meter, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, Proceed To step 69 and perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), in that order.

NG	REPLACE FUEL INJECTOR ASSEMBLY (YARIS_NCP93 RM000001EDS04FX.html)

OK
REPLACE MASS AIR FLOW METER (YARIS_NCP93 RM000001D0L00WX.html)

63.CHECK FUEL PRESSURE

1. Inspect the fuel pressure (YARIS_NCP93 RM000001EF100YX_01_0002.html).
   

NG	Go to step 68

OK

64.INSPECT SPARK PLUG

1. Inspect the spark plugs (YARIS_NCP93 RM000001EFG05DX_01_0002.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 69 and perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), 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 69 and perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), 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) (YARIS_NCP93 RM000001EFJ02JX.html)
C	REPLACE SPARK PLUG (ALL CYLINDER) (YARIS_NCP93 RM000001EFJ02JX.html)

A

65.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 69, perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), in that order.

B	Go to step 67
C	Go to step 69

A

66.CHECK FUEL PRESSURE

HINT:

For the fuel pressure inspection, refer to the following procedures (YARIS_NCP93 RM000001EF100YX_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*1

   HINT:

   1. If the engine cannot be started, check the fuel pressure after cranking the engine.
      
   2. *1: From step 69, perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), in that order.
      

B	Go to step 69

A
REPLACE FUEL PRESSURE REGULATOR (YARIS_NCP93 RM000000SL804XX.html)

67.INSPECT 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
   400 ppm or higher	A
   Less than 400 ppm	B*1

   HINT:

   1. If the concentration is 400 ppm or higher, a fuel injector assembly may have a sealing problem.
      
   2. *1: From step 69, perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), in that order.
      

B	Go to step 69

A
REPLACE FUEL INJECTOR ASSEMBLY (YARIS_NCP93 RM000001EDS04FX.html)

68.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. 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 circuit, check if engine starting trouble occurs again. If engine starting trouble still occurs, Proceed To step 69 and perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), air induction system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), in that order.
      

B	CHECK FUEL PUMP CONTROL CIRCUIT (YARIS_NCP93 RM000001DN703JX.html)

A
REPAIR OR REPLACE FUEL LINE

69.CHECK MALFUNCTION CONDITION

1. If the malfunction could not be identified during the inspection in steps 38, 39, 40 and 46, perform fuel system troubleshooting C (steps 70 to 73).
   
   

   Result

   Performed Step	Troubleshooting by System	Procedure	Proceed To
   Steps 38, 39, 40 and 46	Fuel system troubleshooting C	70 to 73	A

2. If the malfunction could not be identified during the inspection in step 44, perform ignition system troubleshooting (steps 74 to 79).
   
   

   Result

   Performed Step	Troubleshooting by System	Procedure	Proceed To
   Step 44	Ignition system troubleshooting	74 to 79	B

3. If the malfunction could not be identified during the inspection in steps 53 and 54, perform intake air system troubleshooting (steps 80 to 82). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 83 to 90).
   
   

   Result

   Performed Step	Troubleshooting by System	Procedure	Proceed To
   Step 53 and 54	Intake air system troubleshooting	80 to 82	C
   	Fuel system troubleshooting A	83 to 90

4. If the malfunction could not be identified during the inspection in steps 55, 56, 57, 58, 61, 62, 64, 65, 66, 67 and 68, perform fuel system troubleshooting A (steps 91 to 98), fuel system troubleshooting B (steps 99 to 101), intake air system troubleshooting (steps 102 to 104), and ignition system troubleshooting (steps 105 to 110), in that order.
   
   

   Result

   Performed Step	Troubleshooting by System	Procedure	Proceed To
   Steps 55, 56, 57, 58, 61, 62, 64, 65, 66, 67 and 68	Fuel system troubleshooting A	91 to 98	D
   	Fuel system troubleshooting B	99 to 101
   	Intake air system troubleshooting	102 to 104
   	Ignition system troubleshooting	105 to 110

B	Go to step 74
C	Go to step 80
D	Go to step 91

A

70.INSPECT FUEL INJECTOR ASSEMBLY

1. Inspect the fuel injector assembly (YARIS_NCP93 RM000001EDQ046X.html).
   

NG	REPLACE FUEL INJECTOR ASSEMBLY (YARIS_NCP93 RM000001EDS04FX.html)

OK

71.CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

1. Check the harnesses and connectors, referring to DTC P0300 inspection procedure (YARIS_NCP93 RM000000XH30M0X_12_0032.html).
   

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.
   

NG	CHECK FUEL INJECTOR CIRCUIT (YARIS_NCP93 RM000000ZRM0BTX.html)

OK

72.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (YARIS_NCP93 RM000001DBN01PX.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	Go to step 73

OK
END (CRANKSHAFT POSITION SENSOR IS DEFECTIVE) (YARIS_NCP93 RM000001DBP00YX.html)

73.CHECK CAMSHAFT POSITION SENSOR

1. Replace the camshaft position sensor (YARIS_NCP93 RM000001DBJ016X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

OK
END (CAMSHAFT POSITION SENSOR IS DEFECTIVE) (YARIS_NCP93 RM000001DBL011X.html)

74.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 SENSOR (YARIS_NCP93 RM000001DBM00YX.html)

OK

75.CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)

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

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

   OK:

   Sensor is installed correctly.
   

NG	SECURELY REINSTALL SENSOR (YARIS_NCP93 RM000001DBI011X.html)

OK

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

1. Check the harnesses and connectors, referring to DTC P0335 inspection procedure (YARIS_NCP93 RM000000TCW0MCX_09_0004.html).
   

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.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

77.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

1. Check the harnesses and connectors, referring to DTC P0340 inspection procedure (YARIS_NCP93 RM0000012JE06AX_09_0003.html).
   

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.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

78.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (YARIS_NCP93 RM000001DBN01PX.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	Go to step 79

OK
END (CRANKSHAFT POSITION SENSOR IS DEFECTIVE) (YARIS_NCP93 RM000001DBP00YX.html)

79.CHECK CAMSHAFT POSITION SENSOR

1. Replace the camshaft position sensor (YARIS_NCP93 RM000001DBJ016X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

OK
END (CAMSHAFT POSITION SENSOR IS DEFECTIVE) (YARIS_NCP93 RM000001DBL011X.html)

80.READ VALUE USING TECHSTREAM (ISC LEARNING VALUE)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON and turn the Techstream on.
   

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

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

   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 82

A

81.CHECK CYLINDER COMPRESSION PRESSURE

1. Inspect the compression (YARIS_NCP93 RM000001DCF01KX_01_0008.html).
   

NG	CHECK AND REPAIR ENGINE ASSEMBLY

OK
CHECK VALVE TIMING (YARIS_NCP93 RM000001DCS011X.html)

82.INSPECT ENGINE COOLANT TEMPERATURE SENSOR

1. Inspect the engine coolant temperature sensor (YARIS_NCP93 RM000001DBF01ZX.html).
   

NG	REPLACE ENGINE COOLANT TEMPERATURE SENSOR (YARIS_NCP93 RM000001DBH011X.html)

OK

83.CHECK FUEL PRESSURE

HINT:

For the fuel pressure inspection, refer to the following procedures (YARIS_NCP93 RM000001EF100YX_01_0002.html).

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

   Standard:

   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 89

OK

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

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. 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 (YARIS_NCP93 RM000001EDS04FX.html)

A

85.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

86.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 SENSOR (YARIS_NCP93 RM000001DBM00YX.html)

OK

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

1. Check the harnesses and connectors, referring to DTC P0335 inspection procedure (YARIS_NCP93 RM000000TCW0MCX_09_0004.html).
   

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.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

88.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (YARIS_NCP93 RM000001DBN01PX.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

OK
END (CRANKSHAFT POSITION SENSOR IS DEFECTIVE) (YARIS_NCP93 RM000001DBP00YX.html)

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

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON and turn the Techstream 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 90

A
REPAIR OR REPLACE FUEL LINE

90.INSPECT FUEL PUMP

1. Inspect the fuel pump (YARIS_NCP93 RM000000SL602SX.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 (YARIS_NCP93 RM000001JUN00MX.html)

OK
REPLACE FUEL PRESSURE REGULATOR (YARIS_NCP93 RM000000SL804XX.html)

91.CHECK FUEL PRESSURE

HINT:

For the fuel pressure inspection, refer to the following procedures (YARIS_NCP93 RM000001EF100YX_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 97

A

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

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. 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 (YARIS_NCP93 RM000001EDS04FX.html)

A

93.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

94.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 SENSOR (YARIS_NCP93 RM000001DBM00YX.html)

OK

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

1. Check the harnesses and connectors, referring to DTC P0335 inspection procedure (YARIS_NCP93 RM000000TCW0MCX_09_0004.html).
   

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.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

96.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (YARIS_NCP93 RM000001DBN01PX.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

OK
END (CRANKSHAFT POSITION SENSOR IS DEFECTIVE) (YARIS_NCP93 RM000001DBP00YX.html)

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

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON and turn the Techstream 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 98

A
REPAIR OR REPLACE FUEL LINE

98.INSPECT FUEL PUMP

1. Inspect the fuel pump (YARIS_NCP93 RM000000SL602SX.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 (YARIS_NCP93 RM000001JUN00MX.html)

OK

99.CHECK PURGE VSV

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

2. Start the engine.
   

3. Idle the engine.
   

4. Disconnect the connector of the purge VSV.
   

5. Check if air flows through the purge VSV.
   

   OK:

   Air does not flow.
   

6. Connect the connector of the purge VSV.
   

7. Connect the purge hose of the purge VSV.
   

   HINT:

   When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear DTCs (YARIS_NCP93 RM000000PDK0QGX.html).

NG	INSPECT PURGE VSV (YARIS_NCP93 RM000001CK0018X.html)

OK

100.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
   400 ppm or higher	A
   Less than 400 ppm	B

   HINT:

   If the concentration is 400 ppm or higher, a fuel injector assembly may have a sealing problem.

B	Go to step 101

A
REPLACE FUEL INJECTOR ASSEMBLY (YARIS_NCP93 RM000001EDS04FX.html)

101.CHECK INTAKE VALVE

1. Check if carbon is on the intake valves.
   

   Result

   Result	Proceed To
   Carbon present	A
   No carbon present	B

B	Go to step 102

A
CLEAN INTAKE VALVE

102.READ VALUE USING TECHSTREAM (ISC LEARNING VALUE)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

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

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

   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 104

A

103.CHECK CYLINDER COMPRESSION PRESSURE

1. Inspect the compression (YARIS_NCP93 RM000001DCF01KX_01_0008.html).
   

NG	CHECK AND REPAIR ENGINE ASSEMBLY

OK
CHECK VALVE TIMING (YARIS_NCP93 RM000001DCS011X.html)

104.INSPECT ENGINE COOLANT TEMPERATURE SENSOR

1. Inspect the engine coolant temperature sensor (YARIS_NCP93 RM000001DBF01ZX.html).
   

NG	REPLACE ENGINE COOLANT TEMPERATURE SENSOR (YARIS_NCP93 RM000001DBH011X.html)

OK

105.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 SENSOR (YARIS_NCP93 RM000001DBM00YX.html)

OK

106.CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)

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

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

   OK:

   Sensor is installed correctly.
   

NG	SECURELY REINSTALL SENSOR (YARIS_NCP93 RM000001DBI011X.html)

OK

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

1. Check the harnesses and connectors, referring to DTC P0335 inspection procedure (YARIS_NCP93 RM000000TCW0MCX_09_0004.html).
   

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.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

108.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

1. Check the harnesses and connectors, referring to DTC P0340 inspection procedure (YARIS_NCP93 RM0000012JE06AX_09_0003.html).
   

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.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

109.CHECK CRANKSHAFT POSITION SENSOR

1. Replace the crankshaft position sensor (YARIS_NCP93 RM000001DBN01PX.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	Go to step 110

OK
END (CRANKSHAFT POSITION SENSOR IS DEFECTIVE) (YARIS_NCP93 RM000001DBP00YX.html)

110.CHECK CAMSHAFT POSITION SENSOR

1. Replace the camshaft position sensor (YARIS_NCP93 RM000001DBJ016X.html).
   

2. Check the engine start operation.
   

   OK:

   Malfunction has been repaired successfully.
   

NG	REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

OK
END (CAMSHAFT POSITION SENSOR IS DEFECTIVE) (YARIS_NCP93 RM000001DBL011X.html)