Inspection Procedure 20

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

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

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

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 1. Using the scan tool MB991502, read the diagnostic trouble code (DTC).
If DTC is not output, go to Step 2.
If DTC is output, go to Trouble Code Diagnostic Procedures.







STEP 2. Check the ignition timing.
- The ignition timing should retard more when knock sensor connector B-32 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.
1. 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.