Dtc P1603 Engine Stall History

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT

READ FREEZE FRAME DATA

CHECK INTAKE SYSTEM

CHECK PURGE VSV

READ FREEZE FRAME DATA

READ VALUE USING TECHSTREAM (SHORT FT #1)

READ FREEZE FRAME DATA

INSPECT MASS AIR FLOW METER

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)

INSPECT TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)

CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

READ FREEZE FRAME DATA

READ FREEZE FRAME DATA

INSPECT THERMOSTAT

READ FREEZE FRAME DATA

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

READ FREEZE FRAME DATA

PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR EVAP CONTROL)

INSPECT PURGE VSV

CHECK HARNESS AND CONNECTOR (PURGE VSV POWER SOURCE)

CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

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

INSPECT FUEL PUMP

CHECK FUEL SYSTEM

READ FREEZE FRAME DATA

INSPECT MASS AIR FLOW METER

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)

INSPECT TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)

CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

READ FREEZE FRAME DATA

READ FREEZE FRAME DATA

INSPECT THERMOSTAT

READ FREEZE FRAME DATA

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

READ FREEZE FRAME DATA

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT LINEAR)

READ FREEZE FRAME DATA

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

INSPECT MASS AIR FLOW METER

INSPECT TERMINAL VOLTAGE (FUEL INJECTOR CIRCUIT)

INSPECT TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL)

READ FREEZE FRAME DATA

READ FREEZE FRAME DATA (IDLE SPARK ADVN CTRL #)

READ FREEZE FRAME DATA

READ FREEZE FRAME DATA

READ FREEZE FRAME DATA

READ FREEZE FRAME DATA

READ FREEZE FRAME DATA

INSPECT MASS AIR FLOW METER

INSPECT TERMINAL VOLTAGE (FUEL INJECTOR CIRCUIT)

INSPECT TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL)

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

INSPECT FUEL PUMP

CHECK FUEL SYSTEM

REPLACE MALFUNCTIONING PARTS

CLEAR DTC

PERFORM CONFIRMATION DRIVING PATTERN

DTC P1603 Engine Stall History

DTC P1605 Rough Idling

DESCRIPTION

1. P1603
   

After starting the engine, this DTC is stored when the engine stops without the ignition switch being operated.
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 has run out of fuel in the past before performing troubleshooting, as this DTC is also stored when the engine stalls due to running out of fuel.

DTC No.	DTC Detection Condition	Trouble Area
P1603 *1	After monitoring for startability problems (P1604) finishes and 5 seconds or more elapse after starting the engine, with the engine running, the engine stops (the engine speed drops to 200 rpm or less) without the ignition switch being operated for 0.5 seconds or more (1 trip detection logic).	Air leak in intake system Purge VSV Brake booster hose not connected properly Mass air flow meter Engine coolant temperature sensor Wire harness or connector Air fuel ratio sensor Power supply circuit (purge VSV, fuel injector assembly, No. 1 ignition coil) Fuel pump Fuel pump control system Fuel line (fuel filter, pipes and hoses) Throttle with motor body assembly Camshaft timing oil control valve assembly Knock sensor Air conditioning system Power steering system Electrical load signal system Automatic transaxle system Park/neutral position switch assembly ECM

*1: Only for Automatic Transaxle

1. P1605
   

This DTC is stored if the engine speed drops below the set speed.
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 has run out of fuel in the past before performing troubleshooting, as this DTC is also stored when idling is unstable due to running out of fuel.

DTC No.	DTC Detection Condition	Trouble Area
P1605	After 5 seconds or more elapse after starting the engine, with the engine running, the engine speed drops to 400 rpm or less (1 trip detection logic).	Air leak in intake system Purge VSV Brake booster hose not connected properly Mass air flow meter Engine coolant temperature sensor Wire harness or connector Air fuel ratio sensor Power supply circuit (purge VSV, fuel injector assembly, No. 1 ignition coil) Fuel pump Fuel pump control system Fuel line (fuel filter, pipes and hoses) Throttle with motor body assembly Camshaft timing oil control valve assembly Knock sensor No. 1 ignition coil Fuel injector assembly Spark plug(s) Air conditioning system Power steering system Electrical load signal system Automatic transaxle system*1 Park/neutral position switch assembly*1 ECM

*1: for Automatic Transaxle

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 rough idling

Freeze Frame Data P1605 Rough Idling

Parameter	-3	-2	-1	0	1	Unit
Engine Speed	699	691	610	385	175	rpm
Calculate Load	29.4	29.4	29.4	39.2	45.8	%
Vehicle Load	16.0	16.0	20.3	60.0	67.4	%
MAF	1.67	1.67	1.87	3.43	1.76	gm/sec
Atmosphere Pressure	-0	-0	-0	-0	-0	psi(gauge)
Coolant Temp	203	203	203	203	203	F
Intake Air	99	99	99	99	99	F
Ambient Temperature	75	75	75	75	75	F
Battery Voltage	13.437	13.417	13.359	12.949	12.714	V
Throttle Sensor Volt %	14.9	14.9	16.8	16.8	16.8	%
Throttle Sensor #2 Volt %	46.2	46.2	48.6	49.0	49.0	%
Throttle Sensor Position	0.0	0.0	0.0	0.0	0.0	%
Throttle Motor DUTY	14.9	14.9	16.8	16.8	16.8	%
Injector (Port)	2482	2479	2490	2839	4043	μs
Injection Volume (Cylinder 1)	0.066	0.066	0.067	0.067	0.067	ml
Fuel Pump/Speed Status	ON	ON	ON	ON	ON
EVAP (Purge) VSV	17.2	17.2	16.8	16.4	15.6	%
Evap Purge Flow	6.9	6.9	6.9	6.9	6.9	%
Purge Density Learn Value	1.000	1.000	1.000	1.000	1.000
EVAP purge VSV	OFF	OFF	OFF	OFF	OFF
Target Air-Fuel Ratio	0.998	0.998	0.998	0.998	0.999
AF Lambda B1 S1	0.997	0.997	0.998	1.133	1.232
AFS Voltage B1 S1	3.307	3.307	3.332	3.820	4.264	V
O2S B1 S2	0.835	0.835	0.835	0.835	0.835	V
Short FT #1	2.343	2.343	2.343	3.125	7.812	%
Long FT #1	-10157	-10157	-10157	-10157	-10157	%
Total FT #1	-0.071	-0.071	-0.071	-0.071	-0.067
Fuel System Status #1	CL	CL	CL	CL	CL
IGN Advance	5.0	5.0	5.5	10.5	10.5	deg
Knock Feedback Value	-1.5	-1.5	-1.5	-1.5	-1.5	CA
Knock Correct Learn Value	16.2	16.2	16.2	16.2	16.2	CA
VVT Control Status #1	OFF	OFF	OFF	OFF	OFF
Starter Signal	OFF	OFF	OFF	OFF	OFF

WIRING DIAGRAM

Refer to DTC P0031 for the air fuel ratio sensor circuit (YARIS_NCP93 RM000000WC10MFX_07.html).
Refer to DTC P0351 for the ignition coil circuit (YARIS_NCP93 RM000000XH40MYX_07.html).
Refer to DTC P0451 for the EVAP system circuit (YARIS_NCP93 RM0000012MC06ZX_05.html).
Refer to Fuel Pump Control Circuit (YARIS_NCP93 RM000001F7001EX_02.html).
Refer to Fuel Injector Circuit (YARIS_NCP93 RM000000ZRM0CSX_02.html).

INSPECTION PROCEDURE

HINT:

1. In contrast to normal malfunction diagnosis for components, circuits and systems, DTCs P1603 and P1605 are used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as engine stall.
   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. Use any information from the customer problem analysis about the condition of the vehicle at the time when the problem occurred (how the engine stopped, conditions when the engine was restarted, etc.) as a reference.
   
   

   Symptom	Suspected Area
   Engine vibration occurs and engine stops	Air fuel ratio abnormal
   Engine stops with no engine vibration	Ignition system, fuel injection stoppage, high load from external parts
   Engine can be started with accelerator pedal depressed	Insufficient air volume
   Rough idling after engine started	Air fuel ratio abnormal, abnormal combustion

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 RM000000PDS0OYX.html).
   
6. When DTC P1603 (Engine Stall History) is stored, DTC P1605 (Rough Idling) is also stored. When confirming freeze frame data, check DTC P1605. (The ECM stores DTC P1605 first. Therefore, the 5 sets of freeze frame data can be confirmed through DTC P1605, enabling the technician to obtain more information.)
   
7. When confirming freeze frame data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.
   
8. Try to operate 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 the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
   
9. Inspections take into account the fact that the malfunction may not have reoccurred and place emphasis on checking the vehicle conditions present at the time when the malfunction occurred.
   
10. When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.
    

Inspection flow:

Using freeze frame data, narrow down the parts to be inspected according to the vehicle conditions at the time when the malfunction occurred.

1. P1603:
   

1. If the engine stalled when the intake air volume was low (during idling or deceleration), there may be a decrease in torque due to an incorrect air fuel ratio, etc.
   
2. If the engine stalled when the intake air volume was high (during driving or acceleration), there may be a major malfunction such as continuous misfire due to ignition stoppage, fuel injection stoppage, etc. and the torque drops to zero.
   

1. If the engine speed decreased slowly, there may have been a decrease in torque due to an air fuel ratio that was incorrect (by approximately 20 to 30%), etc.
   
2. If the engine speed decreased rapidly, there may have been a malfunction such as when the engine misfires almost continuously due to ignition stoppage, fuel injection stoppage, etc., or when the external load increases due to an external part malfunctioning.
   

1. If the air fuel ratio was abnormal, there may have been an intake air leak, sensor malfunction, or fuel supply problem.
   
2. If the air fuel ratio was normal, the air volume may have been insufficient or the ignition timing may have been incorrect.
   

P1603 inspection flow: Narrow down the parts to be inspected according to the vehicle conditions at the time when the malfunction occurred (freeze frame data).

Vehicle State	Engine Speed	Suspected Area		Primary Parts to Inspect	Procedure
Idling or decelerating	Slowly decreases and engine stalls	Air fuel ratio abnormal	Air suction	Intake system connections Purge VSV system Brake booster	3 to 6
			Sensor malfunction (value from sensor too lean)	Mass air flow meter Engine coolant temperature sensor Air fuel ratio sensor system Thermostat Power supply circuit (air fuel ratio sensor)	7 to 16
			Sensor malfunction (value from sensor too rich)		25 to 34
			Fuel supply problem	Fuel pump control system Purge VSV system Fuel line ECM	17 to 24
		Intake air volume insufficient	ISC flow rate	Throttle with motor body assembly (ISC valve)	35 to 37
			Excessive valve overlap	Camshaft timing oil control valve assembly	38
		Ignition timing incorrect	Does not operate as expected	Engine coolant temperature sensor Mass air flow meter Knock sensor	39 to 41
	Rapidly decreases and engine stalls	Ignition and injection stops (electrical system malfunction)	Power temporarily cut	Power supply circuit (fuel injector assembly, No. 1 ignition coil)	42, 43
		External part malfunctioning	Increase in load	Air conditioning system Electrical load signal system Power steering system Automatic transaxle system Park/neutral position switch assembly	46 to 49
Accelerating	-	Crankshaft position sensor, Camshaft position sensor malfunction	Power temporarily cut	Check DTCs	1
		Mass air flow meter	Foreign matter adhesion	Mass air flow meter	51
		Fuel supply problem	Fuel leak, clog	Fuel pump control system Fuel line	54 to 56
		Ignition and injection stops (electrical system malfunction)	Power temporarily cut	Power supply circuit (fuel injector assembly, No. 1 ignition coil)	52, 53

1. P1605:
   

1. If the engine speed decreased slowly, there may have been a decrease in torque due to an air fuel ratio that was incorrect (by approximately 20 to 30%), etc.
   
2. If the engine speed decreased rapidly, there may have been a malfunction such as when the engine misfires almost continuously due to ignition stoppage, fuel injection stoppage, etc., or when the external load increases due to an external part malfunctioning.
   

1. If the air fuel ratio was abnormal, there may have been an intake air leak, sensor malfunction, or fuel supply problem.
   
2. If the air fuel ratio was normal, the air volume may have been insufficient or the ignition timing may have been incorrect.
   

P1605 inspection flow: Narrow down the parts to be inspected according to the vehicle conditions at the time when the malfunction occurred (freeze frame data).

Engine Speed	Suspected Area		Primary Parts to Inspect	Procedure
Slowly decreases and engine stalls	Air fuel ratio abnormal	Air suction	Intake system connections Purge VSV system Brake booster	3 to 6
		Sensor malfunction (value from sensor too lean)	Mass air flow meter Engine coolant temperature sensor Air fuel ratio sensor system Thermostat Power supply circuit (air fuel ratio sensor)	7 to 16
		Sensor malfunction (value from sensor too rich)		25 to 34
		Fuel supply problem	Fuel pump control system Purge VSV system Fuel line ECM	17 to 24
	Intake air volume insufficient	ISC flow rate	Throttle with motor body assembly (ISC valve)	35 to 37
	Ignition timing incorrect	Does not operate as expected	Knock sensor Engine coolant temperature sensor Mass air flow meter	39 to 41
Rapidly decreases and engine stalls	Ignition and injection stops (electrical system malfunction)	Power temporarily cut	Power supply circuit (fuel injector assembly, No. 1 ignition coil)	42, 43
	External part malfunctioning	Increase in load	Air conditioning system Electrical load signal system Power steering system Automatic transaxle system*1 Park/neutral position switch assembly*1	46 to 49

*1: for Automatic Transaxle

NOTICE:

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

1.CHECK ANY OTHER DTCS OUTPUT

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 DTCs (YARIS_NCP93 RM000000PDK0T5X.html).
   

   Result

   Result	Proceed To
   DTC P1603 and/or P1605 are output	A
   DTCs other than P1603 and P1605 are output	B

B	GO TO DTC CHART (YARIS_NCP93 RM000000PDF0EWX.html)

A

2.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 RM000000PDS0OYX.html).
   
   

   Result

   Problem Symptom	Freeze Frame Data Item			Suspected Area	Proceed To
   	Closed Throttle Position SW	Engine Speed	Total of Short FT #1 and Long FT #1
   When idling or decelerating, engine speed slowly decreases and engine stalls	All 5 sets of freeze frame data are ON	Decreases slowly*1	All 5 sets of freeze frame data are +15% or more*2	Air suction Sensor malfunction (value from sensor too lean) Fuel supply problem	A
   			At least 1 of the 5 sets of freeze frame data is -15% or less*3	Sensor malfunction (value from sensor too rich)	B
   			All 5 sets of freeze frame data are between -15% and +15%	Intake air volume insufficient Ignition timing incorrect	C
   When idling or decelerating, engine speed rapidly decreases and engine stalls		Decreases rapidly*1	-	Fuel injection stoppage, ignition stoppage Load from external parts	D
   When accelerating or driving at constant speed, engine stalls*4	At least one is OFF	-	-	Sensor malfunction Fuel injection stoppage, ignition stoppage Fuel supply problem	E

   
   
   
   

   HINT:

   1. *1: A rapid decrease in engine speed may be caused by an electrical fault in the shared wiring of all or a number of cylinders, an increase in load from external parts, etc. The engine speed is considered to have decreased rapidly if either of the following conditions applies.
      Otherwise, the engine speed is considered to have decreased slowly.
      
   1. In the freeze frame data, the decrease in engine speed from #3 to #5 is 400 rpm or more.
      
   2. In the freeze frame data, the engine speed at #5 is 120 rpm or less.
      
   1. If the vehicle speed is 27 km/h (17 mph) or less and the difference between Engine Speed and SPD (NT) is 100 rpm or less, inspect the automatic transaxle. (Depending on the rate of vehicle deceleration, the engine speed may have decreased due to the A/T lock-up release being late.)
      
   2. *2: When a DTC is stored, feedback compensation increases because the air fuel ratio is determined to be lean.
      
   3. *3: When a DTC is stored, feedback compensation decreases because the air fuel ratio is determined to be rich.
      
   4. *4: This item should be checked when DTC P1603 is output and is not necessary to check when only P1605 is output.
      

B	Go to step 25
C	Go to step 35
D	Go to step 42
E	Go to step 50

A

3.CHECK INTAKE SYSTEM

1. Check for air leaks in the intake system (vacuum hose disconnection, cracks, damaged gaskets, etc.) (YARIS_NCP93 RM000004VL8003X.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 pipes 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 (the intake air volume is small) and almost the same as the normal values when racing the engine (the intake air volume is high), air leakage may be present.
      
   3. Perform "Inspection After Repair" after repairing or replacing the intake system (YARIS_NCP93 RM000004NJD006X.html).
      

   OK:

   There is no air leaks.
   

NG	REPAIR OR REPLACE INTAKE SYSTEM

OK

4.CHECK PURGE VSV

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

   Text in Illustration

   *1	Purge VSV
   *2	Hose (to Canister)

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.
   

   HINT:

   When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear DTCs (YARIS_NCP93 RM000000PDK0T5X.html).

NG	INSPECT PURGE VSV (YARIS_NCP93 RM000001RMW048X.html)

OK

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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Result	Suspected Area	Proceed To
   Stop Light Switch	At least 1 of the 5 sets of freeze frame data is ON	Air suction from brake booster system	A
   	All 5 sets of freeze frame data are OFF	-	B

B	Go to step 7

A

6.READ VALUE USING TECHSTREAM (SHORT FT #1)

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Start the engine and warm it up until the engine coolant temperature stabilizes.
   

   HINT:

   The A/C switch and all accessory switches should be off.

4. Idle the engine.
   

5. Using the Techstream, read [Short FT #1] of the Data List while depressing the brake pedal.
   

   Standard:

   Short FT #1 changes by +10% or less.
   

   HINT:

   1. Even if the results are normal, the brake booster may have been malfunctioning. Continue this inspection procedure until step 24, and if there are no problems with other parts, replace the brake booster (refer to step 57).
      
   1. When air leaks from the brake booster is present, the feedback compensation increases because the air fuel ratio becomes lean.
      
   1. It is also possible to perform the airtightness inspection to check the brake booster.
      

NG	REPLACE BRAKE BOOSTER (YARIS_NCP93 RM000001KIW01BX.html)

OK

7.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Result	Suspected Area	Proceed To
   Calculate Load	Below 90% of the current value of the vehicle*1	Mass air flow meter	A
   AFS Voltage B1S1	3.3 V or higher*2	Air fuel ratio sensor Wire harness or connector Actual air fuel ratio abnormal	B
   Both freeze frame data items listed above	Values are other than above	-	C

   HINT:

   1. Try to operate 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 the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
      
   2. *1: If the mass air flow meter is malfunctioning, the freeze frame data will show a low engine load value.
      
   3. *2: If the air fuel ratio sensor is malfunctioning and constantly outputs a value indicating the air fuel ratio is lean, the actual air fuel ratio will become rich and the engine may stall.
      

B	Go to step 9
C	Go to step 12

A

8.INSPECT MASS AIR FLOW METER

1. Remove the mass air flow meter.
   

2. Check for foreign matter in the air flow passage of the mass air flow meter.
   

   Result

   Result	Proceed To
   Visible foreign matter is present	A
   Visible foreign matter is not present	B

   HINT:

   1. Even if the results are normal, the mass air flow meter may have been malfunctioning. Continue this inspection procedure until step 24, and if there are no problems with other parts, replace the mass air flow meter (refer to step 57).
      
   2. Perform "Inspection After Repair" after replacing the mass air flow meter (YARIS_NCP93 RM000004NJD006X.html).
      

B	Go to step 12

A
REPLACE MASS AIR FLOW METER (YARIS_NCP93 RM000003VI000HX.html)

9.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)

1. Connect the Techstream to the DLC3.
   

2. Start the engine.
   

3. Turn the Techstream on.
   

4. Warm up the engine.
   

5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume.
   

6. Change the fuel injection volume using the Techstream, and monitor the voltage output of the air fuel ratio and heated oxygen sensors displayed on the Techstream.
   

   Standard:

   Techstream Display	Specified Condition
   Control the Injection Volume (+12%)	Air fuel ratio sensor output voltage is below 3.1 V
   Control the Injection Volume (-12%)	Air fuel ratio sensor output voltage is higher than 3.4 V

   Result

   Result	Proceed To
   Abnormal	A
   Normal	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. Even if the results are normal, the air fuel ratio sensor may have been malfunctioning. Continue this inspection procedure until step 24, and if there are no problems with other parts, replace the air fuel ratio sensor (refer to step 57).
      

B	Go to step 12

A

10.INSPECT TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)

1. Check the harnesses and connectors, referring to DTC P0031 inspection procedure (YARIS_NCP93 RM000000WC10MFX_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 POWER SOURCE CIRCUIT (YARIS_NCP93 RM000000WC10MFX_09_0008.html)

OK

11.CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

1. Check the harnesses and connectors, referring to DTC P2237 inspection procedure (YARIS_NCP93 RM0000028K60BGX_10_0010.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. Perform "Inspection After Repair" after replacing the air fuel ratio sensor (YARIS_NCP93 RM000004NJD006X.html).
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE AIR FUEL RATIO SENSOR (YARIS_NCP93 RM000003VIL00HX.html)

12.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Result	Proceed To
   Initial Engine Coolant Temp, Ambient Temperature, Initial Intake Air Temp	Difference in temperature between each item is below 10°C*1	A
   	Difference in temperature between each item is 10°C or more*2	B

   HINT:

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

B	Go to step 15

A

13.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 RM000000PDS0OYX.html).
   

   
   
   
   
   

   Result

   Freeze Frame Data Item	Result	Suspected Area	Proceed To
   Initial Engine Coolant Temp, Coolant Temp, Engine Run Time	Range A	Engine coolant temperature sensor Thermostat	A
   	Range B	Engine coolant temperature sensor	B
   	Range C	-	C

   HINT:

   This step is not directly related to engine stall.

B	Go to step 16
C	Go to step 17

A

14.INSPECT THERMOSTAT

1. Inspect the thermostat (YARIS_NCP93 RM000001DG801EX.html).
   

Result

Result	Proceed To
Abnormal	A
Normal	B

HINT:

This step is not directly related to engine stall.

B	Go to step 16

A
REPLACE THERMOSTAT (YARIS_NCP93 RM000001DGA016X.html)

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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Result	Suspected Area	Proceed To
   Coolant Temp	120°C or more	Engine coolant temperature sensor	A
   Coolant Temp, Ambient Temperature	Engine coolant temperature is lower than outside temperature by 15°C or more	Engine coolant temperature sensor
   Both freeze frame data items listed above	Values are other than above	-	B

B	Go to step 17

A

16.INSPECT ENGINE COOLANT TEMPERATURE SENSOR

1. Inspect the engine coolant temperature sensor (YARIS_NCP93 RM000003VIB00IX.html).
   

Result

Result	Proceed To
Abnormal	A
Normal	B

HINT:

1. Even if the results are normal, the engine coolant temperature sensor may have been malfunctioning. Continue this inspection procedure until step 24, and if there are no problems with other parts, replace the engine coolant temperature sensor (refer to step 57).
   
2. Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (YARIS_NCP93 RM000004NJD006X.html).
   

B	Go to step 17

A
REPLACE ENGINE COOLANT TEMPERATURE SENSOR (YARIS_NCP93 RM000003VID00IX.html)

17.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Result	Suspected Area	Proceed To
   EVAP (Purge) VSV	At least 1 of the 5 sets of freeze frame data is not 0%	Purge VSV	A
   	All 5 sets of freeze frame data are 0%	-	B

   HINT:

   If the purge VSV is stuck closed, air fuel ratio compensation by the purge VSV is incorrectly adjusted, and then the air fuel ratio becomes lean and the engine may stall.

B	Go to step 22

A

18.PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR EVAP CONTROL)

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

   Text in Illustration

   *1	Purge VSV
   *2	Hose (to Canister)

2. Connect the Techstream to the DLC3.
   

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

4. Start the engine.
   

5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.
   

6. Operate the purge VSV and check the air flow.
   

   OK:

   Activate the VSV for Evap Control	Specified Condition
   ON	Air flows
   OFF	Air does not flow

   Result

   Result	Proceed To
   Abnormal	A
   Normal	B

HINT:

1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
   
2. Even if the results are normal, the purge VSV may have been malfunctioning. Continue this inspection procedure until step 24, and if there are no problems with other parts, replace the purge VSV (refer to step 57).
   

B	Go to step 22

A

19.INSPECT PURGE VSV

1. Inspect purge VSV (YARIS_NCP93 RM000001RMW048X.html).
   

NG	REPLACE PURGE VSV (YARIS_NCP93 RM000001RMY054X.html)

OK

20.CHECK HARNESS AND CONNECTOR (PURGE VSV POWER SOURCE)

1. Check the harnesses and connectors, referring to DTC P0443 inspection procedure (YARIS_NCP93 RM000000VSO0DPX_04_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 POWER SOURCE CIRCUIT (YARIS_NCP93 RM000000VSO0DPX_04_0004.html)

OK

21.CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

1. Check the harnesses and connectors, referring to DTC P0443 inspection procedure (YARIS_NCP93 RM000000VSO0DPX_04_0005.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
REPLACE ECM (YARIS_NCP93 RM000001CN002IX.html)

22.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

   Result

   Result	Proceed To
   Abnormal	A
   Normal	B

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. While performing the Active Test, make sure that there is no fuel leakage from the pipes, no signs that fuel has leaked, and no fuel smell.
      
   3. If the fuel pump operating noise is abnormal, Proceed To step 23.
      

B	Go to step 24

A

23.INSPECT FUEL PUMP

1. Inspect the fuel pump (YARIS_NCP93 RM000000SL6038X.html).
   

   HINT:

   Perform "Inspection After Repair" after replacing the fuel pump (YARIS_NCP93 RM000004NJD006X.html).

NG	REPLACE FUEL PUMP (YARIS_NCP93 RM000004NLO00FX.html)

OK
CHECK FUEL PUMP CONTROL CIRCUIT (YARIS_NCP93 RM000001F7001EX.html)

24.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 57

A
REPAIR OR REPLACE FUEL SYSTEM (YARIS_NCP93 RM000001GNO017X.html)

25.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Result	Suspected Area	Proceed To
   Calculate Load	110% or more of the current value of the vehicle*1	Mass air flow meter	A
   AFS Voltage B1S1	Below 3.3 V*2	Air fuel ratio sensor Harness and connector Actual air fuel ratio abnormal	B
   Both freeze frame data items listed above	Values are other than above	-	C

   HINT:

   1. Try to operate 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 the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
      
   2. *1: If the mass air flow meter is malfunctioning and incorrectly measures the intake air volume to be higher than the actual volume of air flowing through the intake manifold, the freeze frame data will show a high engine load value.
      
   3. *2: As the air fuel ratio sensor output is low before the sensor warms up, the value at that time cannot be used for diagnosis. If the air fuel ratio sensor is malfunctioning and constantly outputs a value indicating the air fuel ratio is rich, the actual air fuel ratio will become lean and the engine may stall.
      

B	Go to step 27
C	Go to step 30

A

26.INSPECT MASS AIR FLOW METER

1. Remove the mass air flow meter.
   

2. Check for foreign matter in the air flow passage of the mass air flow meter.
   

   Result

   Result	Proceed To
   Visible foreign matter is present	A
   Visible foreign matter is not present	B

HINT:

1. Even if the results are normal, the mass air flow meter may have been malfunctioning. Continue this inspection procedure until step 34, and if there are no problems with other parts, replace the mass air flow meter (refer to step 57).
   
2. Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly (YARIS_NCP93 RM000004NJD006X.html).
   

B	Go to step 30

A
REPLACE MASS AIR FLOW METER (YARIS_NCP93 RM000003VI000HX.html)

27.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)

1. Connect the Techstream to the DLC3.
   

2. Start the engine.
   

3. Turn the Techstream on.
   

4. Warm up the engine.
   

5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume.
   

6. Change the fuel injection volume using the Techstream, and monitor the voltage output of the air fuel ratio and heated oxygen sensors displayed on the Techstream.
   

   Standard:

   Techstream Display	Specified Condition
   Control the Injection Volume (12%)	Air fuel ratio sensor output voltage is below 3.1 V
   Control the Injection Volume (-12%)	Air fuel ratio sensor output voltage is higher than 3.4 V

   Result

   Result	Proceed To
   Abnormal	A
   Normal	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. Even if the results are normal, the air fuel ratio sensor may have been malfunctioning. Continue this inspection procedure until step 34, and if there are no problems with other parts, replace the air fuel ratio sensor (refer to step 57).
      

B	Go to step 30

A

28.INSPECT TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)

1. Check the harnesses and connectors, referring to DTC P0031 inspection procedure (YARIS_NCP93 RM000000WC10MFX_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 POWER SOURCE CIRCUIT (YARIS_NCP93 RM000000WC10MFX_09_0008.html)

OK

29.CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

1. Check the harnesses and connectors, referring to DTC P2237 inspection procedure (YARIS_NCP93 RM0000028K60BGX_10_0010.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. Perform "Inspection After Repair" after replacing the air fuel ratio sensor (YARIS_NCP93 RM000004NJD006X.html).
   

NG	REPAIR OR REPLACE HARNESS AND CONNECTOR

OK
REPLACE AIR FUEL RATIO SENSOR (YARIS_NCP93 RM000003VIL00HX.html)

30.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Result	Proceed To
   Initial Engine Coolant Temp, Ambient Temperature, Initial Intake Air Temp	Difference in temperature between each item is below 10°C*1	A
   	Difference in temperature between each item is 10°C or more*2	B

   HINT:

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

B	Go to step 33

A

31.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 present when the DTC was stored which are recorded in the freeze frame data (YARIS_NCP93 RM000000PDS0OYX.html).
   

   
   
   
   
   

   Result

   Freeze Frame Data Item	Result	Suspected Area	Proceed To
   Initial Engine Coolant Temp, Coolant Temp, Engine Run Time	Range A	Engine coolant temperature sensor Thermostat	A
   	Range B	Engine coolant temperature	B
   	Range C	-	C

   HINT:

   This step is not directly related to engine stall.

B	Go to step 34
C	Go to step 58

A

32.INSPECT THERMOSTAT

1. Inspect the thermostat (YARIS_NCP93 RM000001DG801EX_01_0001.html).
   

Result

Result	Proceed To
Abnormal	A
Normal	B

HINT:

This step is not directly related to engine stall.

B	Go to step 34

A
REPLACE THERMOSTAT (YARIS_NCP93 RM000001DGA016X.html)

33.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Result	Suspected Area	Proceed To
   Coolant Temp	120°C or higher	Engine coolant temperature sensor	A
   Coolant Temp, Ambient Temperature	Engine coolant temperature is lower than outside temperature by 15°C or more	Engine coolant temperature sensor
   Both freeze frame data items listed above	Values are other than above	-	B

B	Go to step 58

A

34.INSPECT ENGINE COOLANT TEMPERATURE SENSOR

1. Inspect the engine coolant temperature sensor (YARIS_NCP93 RM000003VIB00IX.html).
   

Result

Result	Proceed To
Abnormal	A
Normal	B

HINT:

1. Even if the results are normal, the engine coolant temperature sensor may have been malfunctioning. If there are no problems with other parts, replace the engine coolant temperature sensor (refer to step 57).
   
2. Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (YARIS_NCP93 RM000004NJD006X.html).
   

B	Go to step 57

A
REPLACE ENGINE COOLANT TEMPERATURE SENSOR (YARIS_NCP93 RM000003VID00IX.html)

35.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Result	Suspected Area	Proceed To
   Total of ISC Learning Value and ISC Feedback Value	Below 80% of the current value of the vehicle*1	Throttle with motor body assembly	A
   	120% or more of the current value of the vehicle*2		B
   	From 80 to 120% of the current value of the vehicle	-	C

   HINT:

   1. Try to operate 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 the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
      
   2. *1: If the throttle with motor body assembly has a temporary problem in which it cannot fully close, the intake air volume and engine speed increase. As a result, the ISC learning amount becomes less than the standard. At this time, if the throttle with motor body assembly returns to normal and fully closes, the intake air volume will be insufficient and the engine may stall.
      
   3. *2: If carbon accumulates on the throttle with motor body assembly and the intake air volume decreases, the ISC learning amount is increased to maintain the idling speed. If this situation continues, the ISC learning amount reaches the upper limit, the idling speed cannot be maintained causing idling to become unstable, and the engine may stall.
      

B	Go to step 37
C	Go to step 38

A

36.INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

1. Check for foreign matter and signs that the throttle with motor body assembly was stuck, and also check that the valve and shaft move smoothly during operation.
   

   Result

   Result	Proceed To
   Abnormal	A
   Normal	B

   HINT:

   1. Even if the results are normal, the throttle with motor body assembly may have been malfunctioning. Continue this inspection procedure until step 41, and if there are no problems with other parts, replace the throttle body (refer to step 57).
      
   2. Perform "Inspection After Repair" after replacing the throttle with motor body assembly (YARIS_NCP93 RM000004NJD006X.html).
      

B	Go to step 38

A
REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY (YARIS_NCP93 RM000003VHR00IX.html)

37.INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

1. Check if carbon is in the air flow passage of the throttle with motor body assembly.
   

   Result

   Result	Proceed To
   Carbon in passage	A
   No carbon in passage	B

   HINT:

   1. Even if the results are normal, the throttle with motor body assembly may have been malfunctioning. Continue this inspection procedure until step 41, and if there are no problems with other parts, replace the throttle with motor body assembly (refer to step 57).
      
   2. Perform "Inspection After Repair" after replacing the throttle with motor body assembly (YARIS_NCP93 RM000004NJD006X.html).
      

B	Go to step 38

A
REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY (YARIS_NCP93 RM000003VHR00IX.html)

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

1. Perform the Active Test, referring to DTC P0011 inspection procedure (YARIS_NCP93 RM000000PDU0LTX_09_0002.html).
   

   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 at the advanced side, 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 (YARIS_NCP93 RM000003VHK00GX.html)

OK

39.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item		Suspected Area	Proceed To
   IGN Advance	Knock Correct Learn Value
   Differs from the current value of the vehicle by 10° or more	Below 3°	Engine coolant temperature sensor Mass air flow meter Knock sensor	A
   	3° or more	-	B
   Differs from the current value of the vehicle by less than 10°	-	-

   HINT:

   1. Try to operate 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 the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
      
   2. Even if the results are normal, the knock sensor may have been malfunctioning. If there are no problems with other parts, replace the knock sensor (refer to step 57).
      

B	Go to step 57

A

40.INSPECT ENGINE COOLANT TEMPERATURE SENSOR

1. Inspect the engine coolant temperature sensor (YARIS_NCP93 RM000003VIB00IX.html).
   

   HINT:

   Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (YARIS_NCP93 RM000004NJD006X.html).

NG	REPLACE ENGINE COOLANT TEMPERATURE SENSOR (YARIS_NCP93 RM000003VID00IX.html)

OK

41.INSPECT MASS AIR FLOW METER

1. Inspect the mass air flow meter (intake air temperature sensor) (YARIS_NCP93 RM000003VJA00FX.html).
   

   HINT:

   Perform "Inspection After Repair" after replacing the mass air flow meter or knock sensor (YARIS_NCP93 RM000004NJD006X.html).

NG	REPLACE MASS AIR FLOW METER (YARIS_NCP93 RM000003VI000HX.html)

OK
REPLACE KNOCK SENSOR (YARIS_NCP93 RM000003VIH00IX.html)

42.INSPECT TERMINAL VOLTAGE (FUEL INJECTOR CIRCUIT)

1. Check the harnesses and connectors, referring to DTC P0300 inspection procedure (YARIS_NCP93 RM000000XH30NOX_12_0087.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. A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)
   

NG	CHECK FUEL INJECTOR CIRCUIT (YARIS_NCP93 RM000000ZRM0CSX.html)

OK

43.INSPECT TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL)

1. Check the harnesses and connectors, referring to DTC P0351 inspection procedure (YARIS_NCP93 RM000000XH40MYX_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.
   
3. A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)
   

NG	REPAIR POWER SOURCE CIRCUIT (YARIS_NCP93 RM000000XH40MYX_09_0015.html)

OK

44.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Result	Suspected Area	Proceed To
   Idle Spark Advn Ctrl (#1 to #4)	At least one cylinder shows a value of 4° or more	Fuel injector system Ignition coil system	A
   	All cylinders show a value of less than 4°	-	B

B	Go to step 46

A

45.READ FREEZE FRAME DATA (IDLE SPARK ADVN CTRL #)

1. Change the location of the ignition coil for the cylinder whose Idle Spark Advn Ctrl (#1 to #4) was 4° or more in step 44.
   

2. Connect the Techstream to the DLC3.
   

3. Turn the ignition switch to ON.
   

4. Using the Techstream, select [Idle Spark Advn Ctrl (#1 to #4)] of the Data List.
   

   Result

   Result	Proceed To
   Same as result in step 44	A
   Different from result in step 44	B

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. Perform "Inspection After Repair" after replacing the No. 1 ignition coil (YARIS_NCP93 RM000004NJD006X.html).
      

B	REPLACE NO. 1 IGNITION COIL (YARIS_NCP93 RM000002YO404IX.html)

A

46.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item			Suspected Area	Proceed To
   A/C Signal	Air Conditioner FB Val	Power Steering Signal
   A/C Signal display changes from OFF to ON	Value displayed for Air Conditioner FB Val increases	Does not change from OFF	Air conditioning system	A
   		Changes from OFF to ON	Power steering system	B*1 C*2
   A/C Signal display does not change from OFF	Value displayed for Air Conditioner FB Val does not increase	Changes from OFF to ON
   		Does not change from OFF	-

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

   HINT:

   1. Try to operate 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 the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare these data with the freeze frame data.
      
   2. The normal value for the ISC learning amount is engine displacement (liters) x 0.9.
      
   3. Even if the results are normal, the power steering system may have been malfunctioning. Continue this inspection procedure until step 48 (or step 49), and if there are no problems with other parts, inspect the power steering system (refer to step 57).
      

A	CHECK AIR CONDITIONING SYSTEM (YARIS_NCP93 RM000000PM608AX.html)
C	Go to step 49

B

47.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item				Suspected Area	Proceed To
   Electrical Load Signal	Electric Load Feedback Val	Difference between Engine Speed and Turbine Speed	Vehicle Speed
   Electrical Load Signal display changes from OFF to ON*1, or Value displayed for Electric Load Feedback Val increases*1	Value displayed for Electric Load Val changes	-	-	Electrical load signal circuit	A
   	Value displayed for Electric Load Val does not change	At least 1 of the 5 sets of freeze frame data is below 100 rpm	Below 27 km/h	Automatic transaxle system	B
   			27 km/h or more	-	C
   		All 5 sets of freeze frame data are 100 rpm or more	-	-	C
   Electrical Load Signal display does not change from OFF, or Value displayed for Electric Load Feedback Val does not increase	-	At least 1 of the 5 sets of freeze frame data is below 100 rpm	Below 27 km/h	Automatic transaxle system	B
   			27 km/h or more	-	C
   		All 5 sets of freeze frame data are 100 rpm or more	-	-	C

   HINT:

   1. *1: If the Electrical Load Signal display changes from OFF to ON or the "Electric Load Feedback Val" increases, it probably is a malfunction due to a change in electrical load. Check the generator and the continuity and connections between the generator and ECM.
      
   2. The normal value for the ISC learning amount is engine displacement (liters) x 0.9.
      
   3. Even if the results are normal, the electrical load signal system and/or the automatic transaxle system may have been malfunctioning. Continue this inspection procedure until step 48, and if there are no problems with other parts, inspect the electrical load system and/or the automatic transaxle system (refer to step 57).
      

B	CHECK AUTOMATIC TRANSAXLE SYSTEM
C	Go to step 48

A
CHECK GENERATOR CIRCUIT (YARIS_NCP93 RM000001GNJ010X.html)

48.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item		Suspected Area	Proceed To
   Shift SW Status (P or N)	Neutral Position SW Signal
   P and N position are both OFF in at least one data set	ON when Shift SW Status D or R	Park/neutral position switch assembly	A
   	OFF when Shift SW Status D or R	Automatic transaxle system	B
   All 5 sets of freeze frame data are ON	-	-	C

   HINT:

   Even if the results are normal, the park/neutral position switch assembly and/or automatic transaxle system may have been malfunctioning. If there are no problems with other parts, inspect the park/neutral position switch assembly and/or automatic transaxle system (refer to step 57).

B	CHECK AUTOMATIC TRANSAXLE SYSTEM
C	Go to step 57

A
CHECK PARK/NEUTRAL POSITION SWITCH ASSEMBLY

49.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Suspected Area	Proceed To
   Electrical Load Signal Electric Load Feedback Val
   Electrical Load Signal display changes from OFF to ON*1, or Value displayed for Electric Load Feedback Val increases*1	Electrical load signal circuit	A
   Electrical Load Signal display does not change from OFF, or Value displayed for Electric Load Feedback Val does not increase	-	B

   HINT:

   1. *1: If the Electrical Load Signal display changes from OFF to ON or the "Electric Load Feedback Val" increases, it probably is a malfunction due to a change in electrical load. Check the generator and the continuity and connections between the generator and ECM.
      
   2. The normal value for the ISC learning amount is engine displacement (liters) x 0.9.
      
   3. Even if the results are normal, the electrical load signal system may have been malfunctioning. If there are no problems with other parts, inspect the electrical load system (refer to step 57).
      

B	Go to step 57

A
CHECK GENERATOR CIRCUIT (YARIS_NCP93 RM000001GNJ010X.html)

50.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 RM000000PDS0OYX.html).
   
   

   Result

   Freeze Frame Data Item	Result	Suspected Area	Proceed To
   Throttle Sensor Position, Calculate Load	Calculate Load decreases while Throttle Sensor Position increases	Mass air flow meter	A
   	Calculate Load does not decrease while Throttle Sensor Position increases	-	B

B	Go to step 52

A

51.INSPECT MASS AIR FLOW METER

1. Remove the mass air flow meter.
   

2. Check for foreign matter in the air flow passage of the mass air flow meter.
   

   Result

   Result	Proceed To
   Visible foreign matter is present	A
   Visible foreign matter is not present	B

3. Install the mass air flow meter.
   

   HINT:

   1. Even if the results are normal, the mass air flow meter may have been malfunctioning. Continue this inspection procedure until step 56, and if there are no problems with other parts, replace the mass air flow meter (refer to step 57).
      
   2. Perform "Inspection After Repair" after replacing the mass air flow meter (YARIS_NCP93 RM000004NJD006X.html).
      

B	Go to step 52

A
REPLACE MASS AIR FLOW METER (YARIS_NCP93 RM000003VI000HX.html)

52.INSPECT TERMINAL VOLTAGE (FUEL INJECTOR CIRCUIT)

1. Check the harnesses and connectors, referring to DTC P0300 inspection procedure (YARIS_NCP93 RM000000XH30NOX_12_0087.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. A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)
   

NG	CHECK FUEL INJECTOR CIRCUIT (YARIS_NCP93 RM000000ZRM0CSX.html)

OK

53.INSPECT TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL)

1. Check the harnesses and connectors, referring to DTC P0351 inspection procedure (YARIS_NCP93 RM000000XH40MYX_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.
   
3. A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)
   

NG	REPAIR POWER SOURCE CIRCUIT (YARIS_NCP93 RM000000XH40MYX_09_0015.html)

OK

54.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. Using the Techstream, select the [Control the Fuel Pump/Speed] Active Test.
   

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

   Result

   Result	Proceed To
   Abnormal	A
   Normal	B

   HINT:

   1. Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
      
   2. While performing the Active Test, make sure that there is no fuel leakage from the pipes, no signs that fuel has leaked, and no fuel smell.
      
   3. If the fuel pump operating noise is abnormal, Proceed To step 55.
      

B	Go to step 56

A

55.INSPECT FUEL PUMP

1. Inspect the fuel pump (YARIS_NCP93 RM000000SL6038X.html).
   

   HINT:

   Perform "Inspection After Repair" after replacing the fuel pump (YARIS_NCP93 RM000004NJD006X.html).

NG	REPLACE FUEL PUMP (YARIS_NCP93 RM000004NLO00FX.html)

OK
CHECK FUEL PUMP CONTROL CIRCUIT (YARIS_NCP93 RM000001F7001EX.html)

56.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, remove the foreign matter.

B	Go to step 57

A
REPAIR OR REPLACE FUEL SYSTEM

57.REPLACE MALFUNCTIONING PARTS

1. If the malfunction could not be identified in steps 3 to 24, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.
   
   

   Performed Step	Inspection or Part to Replace
   Step 6	Brake booster replacement
   Step 8	Mass air flow meter replacement
   Step 9	Air fuel ratio sensor replacement
   Step 16	Engine coolant temperature sensor replacement
   Step 18	Purge VSV replacement
   Step 24	Fuel pump replacement

2. If the malfunction could not be identified in steps 25 to 34, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.
   
   

   Performed Step	Inspection or Part to Replace
   Step 26	Mass air flow meter replacement
   Step 27	Air fuel ratio sensor replacement
   Step 34	Engine coolant temperature sensor replacement

3. If the malfunction could not be identified in steps 35 to 41, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.
   
   

   Performed Step	Inspection or Part to Replace
   Step 36, 37	Throttle with motor body assembly replacement
   Step 39	Knock sensor replacement

4. If the malfunction could not be identified in steps 42 to 49, inspect and repair the part which is suspected to be malfunctioning according to the step where an inspection was performed.
   
   

   Performed Step	Inspection or Part to Replace
   Step 46	Air conditioning system inspection and repair Power steering system inspection and repair
   Step 47 or 49	Automatic transaxle system inspection and repair Electrical load system inspection and repair
   Step 48	Park/neutral position switch assembly inspection and repair Automatic transaxle system inspection and repair

5. If the malfunction could not be identified in steps 50 to 56, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.
   
   

   Performed Step	Inspection or Part to Replace
   Step 51	Mass air flow meter replacement

HINT:

1. Referring to the chart, inspect and repair or replace the part from the step where an inspection was performed.
   
2. Perform "Inspection After Repair" after replacing or servicing parts related to engine operation. Refer to detailed information in Initialization (YARIS_NCP93 RM000004NJD006X.html).
   

NEXT

58.CLEAR DTC

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Clear the DTCs (YARIS_NCP93 RM000000PDK0T5X.html).
   

NEXT

59.PERFORM CONFIRMATION DRIVING PATTERN

1. Check if engine stall symptoms are present.
   

   HINT:

   If any engine stall symptoms are present, recheck for DTCs and freeze frame data and perform an inspection.

NG	REPAIR OR REPLACE MALFUNCTIONING PARTS

OK
END