Inspection Procedure 14: Knocking


COMMENTS ON TROUBLE SYMPTOM



  • The failure could possibly be caused by the failed detonation control system, improper thermal value of the spark plug and so on.

PROBABLE CAUSES



  • Failed detonation sensor
  • Failed detonation control system
  • Failed spark plug
  • Failed ignition system
  • 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. 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?

    Check detonation sensor system.
    (Refer to Code No.P0326: Detonation Sensor Circuit Performance ).
    (Refer to Code No.P0327: Detonation Sensor Circuit Low Input ).
    (Refer to Code No.P0328: Detonation Sensor Circuit High Input ).
Check ignition circuit system (Refer to Inspection Procedure 23 ).