Inspection Procedure 2: Neither right nor left automatic leveling operates.: Diagnosis

Required Special Tools: 

• MB992006: Extra fine probe
• MB991223: Harness set
• 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)

1. STEP 1. Using scan tool MB991958, read the diagnostic trouble code. 
   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
   1. Connect scan tool MB991958. Refer to "HOW TO CONNECT SCAN TOO (M.U.T.-III)  ".
   2. Turn the ignition switch to the "ON" position.
   3. Check whether the ETACS-ECU related DTC is set.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is ETACS-ECU code set? 

   YES:  Go to Step 2.

   NO:  Refer to INSPECTION PROCEDURE 1 "DIAGNOSTIC TROUBLE CODE IS NOT SET"  .

   Fig 1: Connecting Special Tools To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Check the operation of the headlights. 

   Check that the headlights illuminate normally.

   Q: Is the check result normal? 

   YES:  Go to Step 3.

   NO:  Check the headlights (Refer to HEADLIGHT  ).

3. STEP 3. Check combination meter. 

   Q: Does the speedometer operate? 

   YES:  Go to Step 4.

   NO:  Diagnosis the combination meter (Refer to COMBINATION METER ). On completion, go to Step 4.

4. STEP 4. Check headlight automatic leveling-ECU connector C-110 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is headlight automatic leveling-ECU connector C-110 in good condition? 

   YES:  Go to Step 5.

   NO:  Repair the damaged parts.

5. STEP 5. Voltage measurement at headlight automatic leveling-ECU connector C-110. 
   1. Disconnect the connector, and measure at the wiring harness-side connector.
   2. Turn "ON" the headlight switch.
   3. Voltage between headlight automatic leveling-ECU connector C-110 (terminal No. 6) and body ground

      The voltage should measure approximately 12 volts (battery positive voltage). 

   Q: Does the voltage measure battery voltage? 

   YES:  Go to  Step 7.

   NO:  Go to Step 6.

   Fig 2: Checking Voltage Between Headlight Automatic Leveling-ECU Connector C-110 (Terminal No. 6) And Body Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Check wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 6) and headlight relay (LOW) connector A-28X (terminal No. 3). 

   Q: Are the wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 6) and headlight relay (LOW) connector A-28X (terminal No. 3) in good condition? 

   YES:  Go to Step 7.

   NO:  Repair the wiring harness.

7. STEP 7. Check combination meter connector C-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is combination meter connector C-03 in good condition? 

   YES:  Go to Step 8.

   NO:  Repair the damaged parts.

8. STEP 8. Check wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 9) and combination meter connector C-03 (terminal No. 20). 
   NOTE: Prior to the wiring harness inspection, check intermediate connector C-34, and repair if necessary.

   Q: Are the wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 9) and combination meter connector C-03 (terminal No. 20) in good condition? 

   YES:  Go to Step 9.

   NO:  Repair the wiring harness.

9. STEP 9. Retest the system. 

   Check that the automatic leveling operates normally.

   Q: Is the check result normal? 

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

   NO:  Replace the headlight automatic leveling-ECU.