Inspection Procedure 14: Knocking

COMMENT ON TROUBLE SYMPTOM

Failure is possibly caused by failed detonation control system, improper thermal value of spark plug and so on.

PROBABLE CAUSE

Failed detonation sensor
Failed detonation control system
Failed ignition system
Failed spark plug
Failed engine-A/T-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. Check spark plug.

Q. Is the check result normal?

	Go to Step 3 .

	Replace spark plug.

STEP 3. Check ignition coil spark.

Q. Is the check result normal?

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

	Check ignition circuit system (Refer to Inspection Procedure 26 ).