Inspection Procedure 2: Power Supply Circuit System: Diagnosis

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.

Required Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V. C. I).
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Resistance measurement at the C-37 SRS-ECU connectors
1. While pushing the part "A" indicated in the figure of the harness side connector, turn the lock lever to the direction of the arrow to release the lock lever, and disconnect the C-37 SRS-ECU connectors.
  
  Fig 1: Turning Lock Lever
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Take the measurements below at the C-37 wiring harness side connectors.
  - Continuity between C-37 wiring harness side connector terminal No. 17 and body ground
    OK: Continuity (Less than 2 ohms)
Q: Is the check result normal?

YES : Go to Step 2.

NO : Repair the wiring harness between the C-37 SRS-ECU connector terminal No. 17 and body ground.

Fig 2: Checking Continuity Between C-37 Connector Terminal No. 17 And Body Ground
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Wiring harness check between the C-36 SRS-ECU connector terminal Nos. 61 and 62 and the ignition switch IG1
NOTE: Prior to the wiring harness inspection, check the ETACS-ECU connectors C-309, C-313 and C-317, and repair if necessary.
- Check the power supply line for open and short circuit.
Q: Is the check result normal?

YES : Go to Step 3.

NO : Repair the wiring harness.
STEP 3. Retest the system
Q: Is the communication between scan tool and SRS-ECU possible?

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

NO : Replace SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU) ).