Inspection Procedure 20

COMMENT
- In case such as the above, the cause is probably that the detonation control is defective or the heat value of the spark plug is inappropriate.

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

DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.




STEP 1. Using the scan tool MB991502, read the diagnostic trouble code (DTC).
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Read the DTC.

If DTC is not output, go to Step 2.

If DTC is output, refer to Diagnostic Trouble Code Chart.







STEP 2. Check the ignition timing.
The ignition timing should retard more when knock sensor connector B-35 is disconnected than when it is connected.

If the ignition timing is advanced, go to Step 3.

If the ignition timing is not advanced, refer to DTC P0325 - Knock Sensor 1 Circuit Malfunction.

STEP 3. 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.