Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q: Is the check result normal?

YES : Go to Step 2.

NO : Repair the CAN bus lines. (Refer to TROUBLESHOOTING .)
STEP 2. Scan tool diagnostic trouble code
Check the engine diagnostic trouble code. (Refer to TROUBLESHOOTING .)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.

NO : Go to Step 3.
STEP 3. Scan tool service data
Check the following service data. (Refer to SERVICE DATA REFERENCE TABLE .)
- Item No.15: Engine speed
- Item No. 16: Engine torque (Driver request value)
Q: Is the check result normal?

YES : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)

NO : Go to Step 4.
STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U0401 set?

YES : Replace the AWC-ECU. (Refer to AWC-ECU .) Then go to Step 5.

NO : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
STEP 5. Check whether the DTC is reset.
Q: Is DTC No. U0401 set?

YES : Return to Step 1.

NO : This diagnosis is complete.