Inspection Procedure 16

INSPECTION PROCEDURE 16: Acceleration Shock.

COMMENT
- There may be an ignition leak accompanying the increase in the spark plug demand voltage during acceleration or the electronic control throttle valve system failed.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Malfunction of the ignition system.
- Malfunction of the electronic control throttle valve system.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic trouble code (DTC).






CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Read the DTC.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Refer to MFI, Diagnostic Trouble Code Chart. Diagnostic Trouble Code Descriptions

NO : Check the following items, and repair or replace the defective items.
a. Check the ignition coil and spark plugs.
b. Check for occurrence of ignition leak.
Then confirm that the malfunction symptom is eliminated.