Comments On Trouble Symptom: Diagnosis

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

MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Check the following connector:
Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case.
- C-128 AWD-ECU connector
- C-32 Joint connector
- C-23 Drive mode selector connector
Q: Are the connectors and terminals in good condition?

YES: Go to Step 2.

NO: Repair the connector(s) or terminal(s). Then go to Step 9.

STEP 2. Resistance measurement between the drive mode selector connector terminals

Remove the drive mode selector (Refer REMOVAL AND INSTALLATION ).

Measure the resistance between the following terminals.

CONTINUITY REFERENCE CHART

Switch position	Terminal number	Normal conditions
FWD	1-2	Continuity exists (2 ohm or less).
FWD	2-3	No continuity
AWD	1-2	No continuity
AWD	2-3	No continuity
LOCK	1-2	No continuity
LOCK	2-3	Continuity exists (2 ohm or less).

Q: Is the check result normal?

YES: Go to Step 3.

NO: Replace the drive mode selector. Then go to Step 9.

STEP 3. Wiring harness check
- Wiring harness between the C-128 AWD-ECU connector (terminal No. 16) and the C-23 drive mode selector connector (terminal No. 3)
- Wiring harness between the C-128 AWD-ECU connector (terminal No. 14) and the C-23 drive mode selector connector (terminal No. 1)
Check the wiring harness above for damage or other problem.

Q: Is the wiring harness in good condition?

YES: Go to Step 4.

NO: Repair the wiring harness. Then go to Step 9.
STEP 4. Resistance measurement at the drive mode selector connector
1. Disconnect the C-23 drive mode selector connector.
2. Measure the resistance between the C-23 wiring harness side connector terminal No. 2 and the body earth.
  OK: 2 ohm or less
Q: Is the check result normal?

YES: Go to Step 8.

NO: Go to Step 5.
STEP 5. Wiring harness check
Check the wiring harness between the C-23 drive mode selector connector (terminal No.2) and the body earth (No.6 and No.17) for damage or other problem.

Q: Is the wiring harness in good condition?

YES: Go to Step 6.

NO: Repair the wiring harness. Then go to Step 9.

Fig 1: Locating Body Ground No.6 (Passenger Side)
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Locating Body Ground No.17 (Driver Side)
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 6. Check the following connector:
Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case.
- C-128 AWD-ECU connector
- C-313, C-317 ETACS-ECU connector
Q: Are the connectors and terminals in good condition?

YES: Go to Step 7.

NO: Repair the connector(s) or terminal(s). Then go to Step 9.
STEP 7. Wiring harness check
Check the wiring harness between the C-128 AWD-ECU connector and the C-313 ETACS-ECU connector for damage or other problem.

Q: Is the wiring harness in good condition?

YES: Go to Step 8.

NO: Repair damage or other problem in the wiring harness. Then go to Step 9.
STEP 8. Retest the system.
Q: Does the malfunction occur again?

YES: Replace AWD-ECU (refer to REMOVAL AND INSTALLATION ). Then go to Step 9.

NO: The trouble can be an intermittent malfunction (refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
STEP 9. Check whether the DTC is reset.
Q: Does the malfunction occur again?

YES: Diagnose again from Step 1.

NO: This diagnosis is complete.