< Lancer SPORTBACK >: 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. Bulb check. 

   Check the bulb(s) of the light that does not illuminate.

   Q: Is the check result normal? 

   • YES < LANCER >  : Go to Step 2.
   • YES < LANCER SPORTBACK >  : Go to  Step 8.
   • NO:  Replace the bulb(s) of the light that does not illuminate.
2. STEP 2. Check rear combination light connector F-20 (taillight/side marker light: LH) or F-06 (taillight/side marker light: RH) for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is rear combination light connector F-20 (taillight/side marker light: RH) or F-06 (taillight/side marker light: LH) in good condition? 

   • YES:  Go to Step 3.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .
3. STEP 3. Resistance measurement at rear combination light connector F-20 (taillight/side marker light: LH) or F-06 (taillight/side marker light: RH). 
   1. Disconnect the connector, and measure at the wiring harness side.
   2. Measure the resistance between the connector of light which does not illuminate and body ground.
      • Measure the resistance between rear combination light (taillight/side marker light: LH) connector F-20 (terminal 1) and body ground.
        Fig 1: Measuring Resistance Between Rear Combination Light Connector F-20 (Terminal 1) And Body Ground

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • Measure the resistance between rear combination light (taillight/side marker light: RH) connector F-06 (terminal 1) and body ground.

        OK: The measured value should be continuity exists (2 ohms or less). 

   Q: Does the measured resistance value correspond with this range? 

   • YES:  Go to  Step 5.
   • NO:  Go to Step 4.
     Fig 2: Measuring Resistance Between Rear Combination Light Connector F-06 (Terminal 1) And Body Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check the wiring harness between rear combination light connectors F-20 (taillight/side marker light: LH) (terminal 1) or F-06 (taillight/side marker light: RH) (terminal 1) and ground. 

   Q: Is the wiring harness between rear combination light connectors F-20 (taillight/side marker light: LH) (terminal 1) or F-06 (taillight/side marker light: RH) (terminal 1) and ground in good condition? 

   • YES:  Go to  Step 7.
   • NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
5. STEP 5. Check ETACS-ECU connectors C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is ETACS-ECU connectors C-311 in good condition? 

   • YES:  Go to Step 6.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .
6. STEP 6. Check the wiring harness between rear combination light connector and ETACS-ECU connector. 

   Check the power supply line for open circuit.

   • Check the wiring harness between rear combination light (taillight/side marker light: LH) connector F-20 (terminal 3) and ETACS-ECU connector C-311 (terminal 10). < LH >
     NOTE: Also check intermediate connector D-14 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-14 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
   • Check the wiring harness between rear combination light (taillight/side marker light: RH) connector F-06 (terminal 3) and ETACS-ECU connector C-311 (terminal 13). < RH >
     NOTE: Also check joint connector C-38 and intermediate connector D-11 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-38 or intermediate connector D-11 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between rear combination light connector and ETACS-ECU connector in good condition? 

   • YES:  Go to Step 7.
   • NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
7. STEP 7. Retest the system. 

   Check that the taillight illuminates normally.

   Q: Does the taillight work normally? 

   • YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
   • NO:  Replace the defective rear combination light unit.
8. STEP 8. Check rear combination light connector F-20 (taillight: LH) or F-06 (taillight: RH), rear side marker light connector F-40 (LH) or F-35 (RH) for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is rear combination light connector F-20 (taillight: LH) or F-06 (taillight: RH), rear side marker light connector F-40 (LH) or F-35 (RH) in good condition? 

   • YES:  Go to Step 9.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .
9. STEP 9. Resistance measurement at rear combination light connector F-20 (taillight: LH) or F-06 (taillight: RH), rear side marker light connector F-40 (LH) or F-35 (RH)). 
   1. Disconnect the connector, and measure at the wiring harness side.
   2. Measure the resistance between the connector of light which does not illuminate and the body ground.
      • Measure the resistance between rear combination light connector F-20 (taillight: LH) or F-06 (taillight: RH) (terminal 3) and body ground.
        Fig 3: Measuring Resistance Between Rear Combination Light Connector F-20 Or F-06 (Terminal 3) And Body Ground

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • Measure the resistance between rear side marker light connector F-40 (LH) or F-35 (RH) (terminal 1) and body ground.

        OK: The measured value should be continuity exists (2 ohms or less). 

   Q: Does the measured resistance value correspond with this range? 

   • YES:  Go to  Step 11.
   • NO:  Go to Step 10.
     Fig 4: Measuring Resistance Between Rear Side Marker Light Connector F-40 (LH) Or F-35 (RH) (Terminal 1) And Body Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
10. STEP 10. Check the wiring harness between rear combination light connector or rear side marker light connector and the body ground. 

    Check the ground line for open circuit.

    • Check the wiring harness between rear combination light connector F-20 (taillight: LH) (terminal 3) and the body ground.
    • Check the wiring harness between rear combination light connector F-06 (taillight: RH) (terminal 3) and the body ground.
    • Check the wiring harness between rear side marker light connector F-40 (LH) (terminal 1) and the body ground.
    • Check the wiring harness between rear side marker light connector F-35 (RH) (terminal 1) and the body ground.

    Q: Is the wiring harness between rear combination light connector or rear side marker light connector and the body ground in good condition? 

    • YES:  Go to  Step 13.
    • NO:  Repair the wiring harness.
11. STEP 11. Check ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is ETACS-ECU connector C-311 in good condition? 

    • YES:  Go to Step 12.
    • NO:  Repair the damaged parts.
12. STEP 12. Check wiring harness between rear combination light connector or rear side marker light connector and ETACS-ECU connector. 

    Check the power supply line for open circuit or short circuit.

    • Check the wiring harness between rear combination light (taillight: LH) connector F-20 (terminal 2) and ETACS-ECU connector C-311 (terminal 10).
      NOTE: Also check intermediate connectors D-14 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-14 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
    • Check the wiring harness between rear combination light (taillight: RH) connector F-06 (terminal 2) and ETACS-ECU connector C-311 (terminal 13).
      NOTE: Also check joint connector C-38 and intermediate connector D-11 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-38 or intermediate connector D-11 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
    • Check the wiring harness between rear side marker light (LH) connector F-40 (terminal 2) and ETACS-ECU connector C-311 (terminal 10).
      NOTE: Also check intermediate connector D-14 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-14 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
    • Check the wiring harness between rear side marker light (RH) connector F-35 (terminal 2) and ETACS-ECU connector C-311 (terminal 13).
      NOTE: Also check intermediate connector D-11 and joint connector C-38 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-11 or joint connector C-38 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between rear combination light connector or rear side marker light connector and ETACS-ECU connector in good condition? 

    • YES:  Go to Step 13.
    • NO:  Repair the wiring harness.
13. STEP 13. Retest the system. 

    Check that the taillight or rear side marker light illuminate normally.

    Q: Do the taillight or rear side marker light work normally? 

    • YES (The light illuminate normally.)  : The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    • NO < When the rear combination light (taillight) do not illuminate >  : Replace the rear combination light socket.
    • NO < When the rear side marker light do not illuminate >  : Replace the rear side marker light socket.