Inspection Procedure 12: The Feeling of Impact or Vibration when Decelerating


COMMENTS ON TROUBLE SYMPTOM



  • The failure could possibly be caused by the insufficient amount of intake air due to failed electronic-controlled throttle valve system.

PROBABLE CAUSES



  • Failed electronic-controlled throttle valve system
  • Contamination around the throttle valve
  • 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 throttle body (throttle valve portion) contamination.

Q. Is the check result normal?
Replace the engine-ECU.
Throttle body (throttle valve area) cleaning (Refer to ).