Diagnostic Procedure
- 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 3.
NO : Repair the CAN bus line (Refer to TROUBLESHOOTING ). After repairing the CAN bus line, go to Step 2.
- STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C1078 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
- STEP 3. Check the tires
Check that the wheels/tires with the identical size are installed, and that each tire pressure is within the value specified on the tire pressure label.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Install the wheels/tires with the identical size, or adjust the tire pressure. Then go to Step 5.
- STEP 4. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. (Refer to TROUBLESHOOTING .)
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 5.
- STEP 5. Scan tool service data
Check the following service data. (Refer to DATA LIST REFERENCE TABLE .)
- Item No.22: FL wheel speed sensor < FL >
- Item No.23: FL wheel speed sensor < FR >
- Item No.24: FL wheel speed sensor < RL >
- Item No.25: FL wheel speed sensor < RR >
Q: Is the check result normal?
YES : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
NO : Replace the AWC-ECU.(Refer to AWC-ECU .)