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Home >> Lexus >> 2012 >> LS 460 AWD V8-4.6L (1UR-FSE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1603 >> Part 2

Part 2





1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603, P1605: Engine Stall History
P1605 - Rough Idling

Standard Resistance:





NG -- REPLACE PURGE VSV Removal
OK -- Continue to next step.

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

(a) Disconnect the E44 purge VSV connector.





(b) Turn the engine switch on (IG).

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

Standard Voltage:





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 (PURGE VSV - EFI MAIN RELAY)
OK -- Continue to next step.

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

(a) Disconnect the E44 purge VSV 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 Open):





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 ECM Removal

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

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.

(e) Check whether the fuel pump operating sound occurs when performing the Active Test on the Techstream.

OK:





Result:





HINT
- Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
- 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.
- If the fuel pump operating noise is abnormal, proceed to step 21.

B -- CHECK FUEL SYSTEM
A -- Continue to next step.

21. INSPECT FUEL PUMP (FOR LOW PRESSURE)

(a) Disconnect the S11 fuel pump (for low pressure) connector.





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

Standard Resistance:





NG -- REPLACE FUEL PUMP (FOR LOW PRESSURE) Removal

OK -- CHECK FUEL PUMP CONTROL SYSTEM Fuel Pump Control Circuit

22. CHECK FUEL SYSTEM

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

Result:





HINT
If there is foreign matter such as iron particles on the fuel pump (for low pressure), fuel filter or fuel tank, remove the foreign matter.

B -- REPLACE MALFUNCTIONING PARTS

A -- REPAIR OR REPLACE FUEL SYSTEM

23. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(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.

B -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

C -- READ FREEZE FRAME DATA
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 airflow 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 55).

B -- READ FREEZE FRAME DATA

A -- REPLACE MASS AIR FLOW METER Removal

25. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

(a) Connect the Techstream to the DLC3.





(b) Turn the engine switch on (IG).

(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 / Active Test / Control the Injection Volume for A/F Sensor.

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

OK:





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 55).

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

26. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR POWER SOURCE)

(a) Disconnect the E47 or E48 air fuel ratio sensor connector.





(b) Turn the engine switch on (IG).

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

Standard Voltage:





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 AIR FUEL RATIO SENSOR POWER SOURCE CIRCUIT P0031
OK -- Continue to next step.

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

(a) Disconnect the E47 or E48 air fuel ratio sensor connector.

(b) Disconnect the E3 and E4 ECM connectors.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





Result:





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.

B -- REPLACE AIR FUEL RATIO SENSOR Removal

C -- REPLACE AIR FUEL RATIO SENSOR Removal

A -- REPAIR OR REPLACE HARNESS OR CONNECTOR

28. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(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 engine switch on (IG).

(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.

B -- INSPECT ENGINE COOLANT TEMPERATURE SENSOR

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

30. INSPECT 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 THERMOSTAT Removal

31. READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(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 57).

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 engine switch on (IG).

(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 body has a temporary problem in which it cannot fully close, the intake air volume and engine speed increase. As a result, the ISC compensation amount becomes less than the standard. At this time, if the throttle body 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 body and the intake air volume decreases, the ISC compensation amount is increased to maintain the idling speed. If this situation continues, the ISC compensation amount reaches the upper limit, the idling speed cannot be maintained causing idling to become unstable, and the engine may stall.

B -- CHECK THROTTLE BODY

C -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT-IE LINEAR)
A -- Continue to next step.

34. CHECK THROTTLE BODY

(a) Check for foreign matter and signs that the throttle body was stuck, and also check that the valve and shaft move smoothly during operation.

Result:





HINT
Even if the results are normal, the throttle body may have been malfunctioning. Continue this inspection procedure until step 40, and if there are no problems with other parts, replace the throttle body (refer to step 55).

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

A -- REPLACE THROTTLE BODY Removal

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