Inspection Procedure 11: The Feeling of Impact or Vibration when Accelerating


COMMENTS ON TROUBLE SYMPTOM



  • Failure is possibly caused by ignition leak occurring in association with the increase of required voltage by the spark plug at an acceleration and failed electronic-control throttle valve system, and so on.

PROBABLE CAUSES



  • Failed ignition system
  • Failed electronic control 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

  • Refer to Data List Reference Table .

  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 (Refer to Inspection Chart for Diagnosis Code ).

STEP 3. Check throttle body (throttle valve portion) contamination.

Q. Is the check result normal?
Go to Step 4 .
Clean throttle body (throttle valve portion) (Refer to ).

STEP 4. Visual check of ignition spark.

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

Q. Is the check result normal?
Replace the engine-ECU.
Go to Step 5 .

STEP 5. Check spark plug.

  • Check spark plug itself (Refer to GROUP 16 - Ignition System - On-vehicle Service - Spark Plug Check and Cleaning ).

Q. Is the check result normal?
Check ignition circuit system (Refer to Inspection Procedure 22 ).
Replace the spark plug.