Inspection Procedure 21: Knocking

COMMENT ON TROUBLE SYMPTOM

Failure is possibly caused by failed detonation control, improper thermal value of spark plug or other faults.

PROBABLE CAUSES

Failed detonation sensor
Failed detonation control system
Failed ignition system
Failed spark plug
Failed engine-ECU or engine-A-M/T-ECU

DIAGNOSIS PROCEDURE

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

Q. 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 to the ignition coil.
Connect the ignition coil connector.
Remove all injector connectors.
At the engine start, check each spark plug procedure a spark.

Q. Is the check result normal?

	Check detonation sensor system (Refer to Code No. P0325 ).

	Check ignition circuit system (Refer to Inspection Procedure 39 <135>, Inspection Procedure 40 <4A9>).