Inspection Procedure 21

COMMENT
- The cause is probably defective detonation control or the heat range of the spark plug is inappropriate.

TROUBLESHOOTING HINTS
The most likely causes for this case:
- Detective knock sensor.
- Incorrect heat range of the spark plug.

DIAGNOSIS

STEP 1. Check the following items.
Check the following items, and repair or replace the defective items.
a. Check the spark plugs.
b. Fuel quality, octane level.
c. Check if the foreign materials (water, kerosene, etc.) got into fuel.

Then confirm that the malfunction symptom is eliminated.