Inspection Procedure 13

COMMENT
- In case such as the above, the cause is probably misfiring due to a weak spark, or an inappropriate air/fuel mixture when the accelerator pedal is depressed.

TROUBLESHOOTING HINTS
The most likely causes for this case:
- Vacuum leak.
- Malfunction of the ignition system.

DIAGNOSIS
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 scan tool MB991502, read the diagnostic trouble code (DTC).
If DTC is not output, go to Step 2.

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

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




STEP 2. Using scan tool MB991502, check actuator test.
1. Check the following items in the actuator test.
Refer to Actuator Test Reference Table.

a. Item 10: EGR Solenoid.

If the check above meets the specification, go to Step 3.

If the check above does not meet the specification, repair or replace. Then confirm that the malfunction symptom is eliminated.

STEP 3. Check the following items.
1. Check the following items, and repair or replace the defective items.

a. Check the ignition coil, spark plugs, spark plug cables.
b. Check for vacuum leaks.

- Broken intake manifold gasket.
- Broken or disconnected vacuum hose.
- Improper operation of the PCV valve.
- Broken air intake hose.

Then confirm that the malfunction symptom is eliminated.