Diagnostic Procedure

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

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

Q: Is the check result normal?
1. YES: Go to Step 3.
2. NO: Repair the CAN bus lines. (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. C1616 set?
1. YES: Go to Step 3.
2. NO: This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code
- Check the KOS diagnostic trouble code. (Refer to DIAGNOSTIC TROUBLE CODE TABLE ).
- Check the WCM diagnostic trouble code. (Refer to DIAGNOSTIC TROUBLE CODE TABLE ).
- Check the ETACS diagnostic trouble code. (Refer to DIAGNOSTIC TROUBLE CODE TABLE ).
Q: Is the DTC set?
1. YES: Perform the relevant troubleshooting.
2. NO: Go to Step 4.
STEP 4. Scan tool data list
Item 42: Ignition switch (Refer to DATA LIST REFERENCE TABLE .)

Q: Is the check result normal?
1. YES: Go to Step 9.
2. NO: Go to Step 5.
STEP 5. Ignition switch check
1. Disconnect C-212 ignition switch connector, and check the continuity between the terminals No. 1 and No. 5 at the ignition switch side.
2. Turn the ignition switch to the "ON" position.
  OK: No continuity
Q: Is the check result normal?
1. YES: Go to Step 6.
2. NO: Replace the ignition switch. (Refer to ON-VEHICLE SERVICE ). Then go to Step 10.
STEP 6. Ignition switch connector, ETACS-ECU connector check: C-212, C-315
Q: Is the check result normal?
1. YES: Go to Step 7.
2. NO: Repair the defective connector. Then go to Step 10.
STEP 7. Check the wiring harness between C-212 ignition switch connector terminal No. 5 and C-315 ETACS-ECU connector terminal No. 7.
Check the power supply line for short (for short to the power supply) circuit.

Q: Is the check result normal?
1. YES: Go to Step 8.
2. NO: Repair the wiring harness. Then go to Step 10.
STEP 8. Scan tool data list
ETACS item No. 287: Starter switch (Refer to DATA LIST REFERENCE TABLE ).

Q: Is the check result normal?
1. YES: Go to Step 9.
2. NO: Replace the ETACS-ECU. (Refer to ETACS-ECU ). Then go to Step 9.
STEP 9. Check whether the DTC is reset.
Q: Is DTC No. C1616 set?
1. YES: Replace the AWC-ECU. (Refer to AWC-ECU ). Then go to Step 10.
2. NO: Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 10. Check whether the DTC is reset.
Q: Is DTC No. C1616 set?
1. YES: Return to Step 1.
2. NO: This diagnosis is complete.