Inspection Procedure 8: The Engine Stalls when Starting the Car (pass out), The Engine Stalls when Decelerating


COMMENTS ON TROUBLE SYMPTOM



  • The failure could possibly be caused by the misfire due to the failed spark plug, improper air-fuel ratio at the accelerator pedal depression and so on when the engine stalls at the acceleration.
  • The failure could possibly be caused by the improper air-fuel ratio due to the insufficient amount of intake air and so on when the engine stalls at the deceleration.

PROBABLE CAUSES



  • Failed ignition system
  • Failed intake air system
  • Contamination around the throttle valve
  • Improper compression pressure
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q. Is diagnosis code set?
Inspection chart for diagnosis code (Refer to ).
Go to Step 2.

STEP 2. M.U.T.-III data list

  • Data list reference table (Refer to ).

  1. Item 11: Accelerator pedal position sensor (main)
  2. Item 12: Accelerator pedal position sensor (sub)
  3. Item 13: Throttle position sensor (main)
  4. Item 15: Throttle position sensor (sub)

Q. Are the check results normal?
Go to Step 3.
Perform the diagnosis code classified check procedure for the sensor that has shown an abnormal data value. Inspection chart for diagnosis code (Refer to ).

STEP 3. Check air inlet from inlet hose and inlet manifold.

Q. Is the check result normal?
Go to Step 4.
Repair.

STEP 4. Check throttle body (throttle valve portion) contamination.

Q. Is the check result normal?
Go to Step 5.
Throttle body (throttle valve area) cleaning (Refer to ).

STEP 5. Visual check of ignition spark.

  • Remove the spark plug and install it to the ignition coil.
  • Connect the ignition coil connector.
  • Disconnect all injector connectors.
  • At the engine start, check each spark plug produces a spark.

Q. Is the check result normal?
Go to Step 6.
Check Inspection Procedure - ignition circuit system (Refer to ).

STEP 6. Check compression pressure.

  • Check the compression pressure (Refer to GROUP 11A - On-vehicle Service - Compression Pressure Check ).

Q. Is the check result normal?
Replace the engine-ECU.
Repair.