[13B] MULTIPORT FUEL INJECTION (MPI) <4G64> - - TROUBLESHOOTING - SYMPTOM PROCEDURES - Inspection Procedure 14: The Feeling of Impact or Vibration when DeceleratingPRINT PAGE / INDEX / PRIOR / NEXT
Inspection Procedure 14: The Feeling of Impact or Vibration when Decelerating
COMMENT ON TROUBLE SYMPTOM
  • Failure is possibly caused by insufficient air intake due to failed idle speed control system.
PROBABLE CAUSE
  • Failed idle speed control system
  • Throttle valve body fouled
  • Failed engine-A/T-ECU
DIAGNOSIS PROCEDURE
STEP 1. MUT-II/III diagnosis code
Q: Diagnosis code set?
YES:  Inspection chart for diagnosis code (Refer to ).
NO:  Go to Step 2 .
STEP 2. Check idle speed control servo for operating sound.
Q: Is the check result normal?
YES:  Go to Step 3 .
NO:  Check idle speed control servo system (Refer to Inspection Procedure 30 ).
STEP 3. MUT-II/III data list
    1. Item 14: Throttle position sensor
Q: Are the check results normal?
YES:  Go to Step 4 .
NO:  Check throttle position sensor system (Refer to Code No. 14 ).
STEP 4. Check throttle body (throttle valve) contamination.
Q: Is the check result normal?
YES:  Replace engine-A/T-ECU.
NO:  Clean throttle body (throttle valve portion) (Refer to ).
[13B] MULTIPORT FUEL INJECTION (MPI) <4G64> - - TROUBLESHOOTING - SYMPTOM PROCEDURES - Inspection Procedure 14: The Feeling of Impact or Vibration when DeceleratingPRINT PAGE / INDEX / PRIOR / NEXT
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