Part 2

1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603, P1605: Engine Stall History
P1605 - Rough Idling - (Continued)

23. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result

HINT
* 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.
* *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.
* *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.

C -- READ FREEZE FRAME DATA

B -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)
A -- Continue to next step.

24. CHECK MASS AIR FLOW METER

(a) Remove the mass air flow meter.

(b) Check for foreign matter in the air flow passage of the mass air flow meter.

Result

HINT
Even if the results are normal, the mass air flow meter may have been malfunctioning. Continue this inspection procedure until step 32, and if there are no problems with other parts, replace the mass air flow meter (refer to step 56).

B -- READ FREEZE FRAME DATA

A -- REPLACE MASS AIR FLOW METER Removal

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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

(d) Idle the engine.

(e) Turn the Techstream on.

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

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

Standard Voltage:

Result

HINT
* 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.
* Even if the results are normal, the air fuel ratio sensor may have been malfunctioning. Continue this inspection procedure until step 32, and if there are no problems with other parts, replace the air fuel ratio sensor (refer to step 56).

B -- READ FREEZE FRAME DATA
A -- Continue to next step.

26. CHECK HARNESS AND CONNECTOR (A/F SENSOR POWER SOURCE)

(a) Disconnect the A/F sensor connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Text in Illustration

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

NG -- CHECK POWER SOURCE CIRCUIT Component Tests and General Diagnostics
OK -- Continue to next step.

27. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

(a) Disconnect the A/F sensor connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

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

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE AIR FUEL RATIO SENSOR Removal

28. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result

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

B -- READ FREEZE FRAME DATA
A -- Continue to next step.

29. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions present when the DTC was stored which are recorded in the freeze frame data.

Result

HINT
This step is not directly related to engine stall.

C -- CLEAR DTC

B -- INSPECT ENGINE COOLANT TEMPERATURE SENSOR
A -- Continue to next step.

30. INSPECT WATER INLET WITH THERMOSTAT

HINT
For the thermostat inspection, refer to the following procedures Testing and Inspection.

Result

HINT
This step is not directly related to engine stall.

B -- INSPECT ENGINE COOLANT TEMPERATURE SENSOR

A -- REPLACE WATER INLET WITH THERMOSTAT Removal

31. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result

B -- CLEAR DTC
A -- Continue to next step.

32. INSPECT ENGINE COOLANT TEMPERATURE SENSOR

HINT
For the engine coolant temperature sensor inspection, refer to the following procedures Testing and Inspection.

Result

HINT
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 56).

B -- REPLACE MALFUNCTIONING PARTS

A -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Removal

33. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result

HINT
* 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.
* *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.
* *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.

C -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT LINEAR)

B -- INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY
A -- Continue to next step.

34. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

(a) 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

HINT
Even if the results are normal, the throttle with motor body assembly may have been malfunctioning. Continue this inspection procedure until step 40, and if there are no problems with other parts, replace the throttle with motor body assembly (refer to step 56).

B -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT LINEAR)

A -- REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY Removal

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

(a) Performing the Active Test, referring to DTC P0011 inspection procedure P0011.

HINT
* Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
* 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.
* 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 rough idle or cause the engine to stall.

NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR INTAKE SIDE) Removal
OK -- Continue to next step.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the Techstream on.

(c) Warm up the engine.

(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT Exhaust Linear (Bank1) or Control the VVT Exhaust Linear (Bank2).

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

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

OK:

HINT
* Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
* 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.
* 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 rough idle or cause the engine to stall.

NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR EXHAUST SIDE) Removal
OK -- Continue to next step.

38. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result

HINT
* 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.
* Even if the results are normal, the knock sensors may have been malfunctioning. If there are no problems with other parts, replace the knock sensors (refer to step 56).

B -- REPLACE MALFUNCTIONING PARTS
A -- Continue to next step.

39. INSPECT ENGINE COOLANT TEMPERATURE SENSOR

HINT
For the engine coolant temperature inspection, refer to the following procedures Testing and Inspection.

NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Removal
OK -- Continue to next step.

40. INSPECT MASS AIR FLOW METER (INTAKE AIR TEMPERATURE SENSOR)

(a) Inspect mass air flow meter Inspection.

NG -- REPLACE MASS AIR FLOW METER Removal

OK -- REPLACE KNOCK SENSOR Removal

41. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR POWER SOURCE)

(a) Disconnect the fuel injector connectors.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Text in Illustration

HINT
* Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
* Make sure there is not an excessive amount of force applied to the wire harness.
* 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 POWER SOURCE CIRCUIT (FUEL INJECTOR CIRCUIT) Component Tests and General Diagnostics
OK -- Continue to next step.

42. CHECK HARNESS AND CONNECTOR (IGNITION COIL POWER SOURCE)

(a) Disconnect the ignition coil connectors.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Text in Illustration

HINT
* Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
* Make sure there is not an excessive amount of force applied to the wire harness.
* 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 POWER SOURCE CIRCUIT (IGNITION COIL POWER SOURCE) P0351
OK -- Continue to next step.

43. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result

B -- READ FREEZE FRAME DATA
A -- Continue to next step.

44. READ VALUE USING TECHSTREAM

(a) Change the location of the ignition coil for the cylinder whose Idle Spark Advn Ctrl (#1 to #6) was 4° or more in step 43.

(b) Connect the Techstream to the DLC3.

(c) Start the engine.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine and ECT / Data List / Idle Spark Advn Ctrl (#1 to #6).

Result

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

B -- REPLACE IGNITION COIL ASSEMBLY Removal
A -- Continue to next step.

45. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result

HINT
* 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.
* *1: Check not only the ON/OFF state of the air conditioner but also the change in air conditioner load.
* *2: for Automatic transmission models
* *3: for Manual transmission models
* The normal value for the ISC learning amount is engine displacement (liters) x 0.9.
* Even if the results are normal, the power steering system may have been malfunctioning. Continue this inspection procedure until step 48, and if there are no problems with other parts, inspect the power steering system (refer to step 56).

C -- READ FREEZE FRAME DATA

B -- READ FREEZE FRAME DATA

A -- CHECK AIR CONDITIONING SYSTEM Symptom Related Diagnostic Procedures

46. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result

HINT
* *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.
* The normal value for the ISC learning amount is engine displacement (liters) x 0.9.
* Even if the results are normal, the electrical load signal system and/or the automatic transmission 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 transmission system (refer to step 56).

C -- READ FREEZE FRAME DATA

B -- CHECK AUTOMATIC TRANSMISSION SYSTEM

A -- CHECK GENERATOR CIRCUIT Testing and Inspection

47. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result

HINT
* *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.
* Even if the results are normal, the electrical load signal 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 (refer to step 56).

NG -- REPLACE MALFUNCTIONING PARTS

OK -- CHECK GENERATOR CIRCUIT Testing and Inspection

48. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result

HINT
Even if the results are normal, the park/neutral position switch assembly and/or automatic transmission system system may have been malfunctioning. If there are no problems with other parts, inspect the park/neutral position switch and/or automatic transmission system system (refer to step 56).

C -- REPLACE MALFUNCTIONING PARTS

B -- CHECK AUTOMATIC TRANSMISSION SYSTEM

A -- CHECK PARK/NEUTRAL POSITION SWITCH ASSEMBLY

49. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result

B -- CHECK HARNESS AND CONNECTOR (FUEL INJECTOR POWER SOURCE)
A -- Continue to next step.

50. CHECK MASS AIR FLOW METER

(a) Remove the mass air flow meter.

(b) Check for foreign matter in the air flow passage of the mass air flow meter.

Result

HINT
Even if the results are normal, the mass air flow meter may have been malfunctioning. Continue this inspection procedure until step 55, and if there are no problems with other parts, replace the mass air flow meter (refer to step 56).

B -- CHECK HARNESS AND CONNECTOR (FUEL INJECTOR POWER SOURCE)

A -- REPLACE MASS AIR FLOW METER Removal