Inspection Procedure 2: Shifting the drive mode selector does not Change the Mode: Diagnosis

WARNING: This page is about a different variant/trim than selected.

STEP 1. Scan tool MB991958 CAN bus diagnostics
Use scan tool MB991958 to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : Go to Step 2.

NO : Repair the CAN bus line (Refer to CAN BUS DIAGNOSTICS TABLE ). On completion, go to Step 2.
STEP 2. Retest the system.
Q: Does the malfunction occur again?

YES : The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).

NO : Go to Step 3.
STEP 3. Scan tool MB991958 actuator test.
Refer to ACTUATOR TEST .
- Item No. 5: Meter illumination
Q: Is the check result normal?

YES : Go to Step 4.

NO : Replace the combination meter. (Refer to COMBINATION METER ). Then go to Step 8.
STEP 4. Resistance measurement between the drive mode selector connector terminals
1. Remove the drive mode selector (Refer to DRIVE MODE SELECTOR ).
2. Measure the resistance between the terminals (Refer to DRIVE MODE SELECTOR ).
Q: Is the check result normal?

YES : Go to Step 5.

NO : Replace the drive mode selector (Refer to DRIVE MODE SELECTOR ). Then go to Step 8.
STEP 5. Wiring harness check
1. Check the wiring harness between the C-228 AWD-ECU connector (terminals No. 14 and 16) and the C-40 drive mode selector connector (terminal No. 2).
2. Check the connector(s) or terminal(s) or wiring harness above for damage or other problem.
Q: Is the check result normal?

YES : Go to Step 6.

NO : Repair the connector(s) or terminal(s) or wiring harness.
STEP 6. Resistance measurement at the drive mode selector connector
1. Disconnect the drive mode selector connector.
2. Measure the resistance between the drive mode selector wiring harness side connector and the body ground.
  OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?

YES : Go to Step 7.

NO : Repair the connector(s) or terminal(s) or wiring harness.
STEP 7. Scan tool MB991958 data list.
Check the following data list. (Refer to DATA LIST REFERENCE TABLE ).
- Item No. 15: AWD mode
Q: Is the check result normal?

YES : Go to Step 9.

NO : Go to Step 8.
STEP 8. Retest the system.
Q: Does the malfunction occur again?

YES : Replace AWD-ECU. Then go to Step 9.

NO : The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
STEP 9. Retest the system.
Q: Does the malfunction occur again?

YES : Troubleshoot the combination meter multi information display (Refer to CHECK PROCEDURE FOR EACH MULTI INFORMATION DISPLAY SCREEN ). Then diagnose again from Step 1.

NO : This diagnosis is complete.