Diagnostic Procedure

Required Special Tools: 

• MB992006: Extra fine probe
• MB991223: Harness set
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicles Communication Interface (V.C.I.)
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A

1. STEP 1. Check the power supply system. 

   With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:

   • Hazard warning light

     Q: Is the check result normal? 

     • YES:  Go to Step 2.
     • NO:  Refer to MALFUNCTION OF ETACS-ECU POWER SUPPLY CIRCUIT .
2. STEP 2. 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 TOOL (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 the DTC set? 

      • YES:  Diagnose the ETACS-ECU. Refer to DIAGNOSTIC TROUBLE CODE CHART .
      • NO:  Go to Step 3.
        Fig 1: Connecting Scan Tool To Data Link Connector

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Using scan tool MB991958, check data list. 

   Check the signals related to the power window operation.

   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 THE SCAN TOOL (M.U.T.-III) ."
   2. Turn the ignition switch to the "ON" position.
   3. Check the data list of the ETACS.
      • Turn the ignition switch to the LOCK (OFF) position.
        ITEM CHART
        
        

        Item No.	Item name	Normal condition
        254	IG voltage	Battery positive voltage

   4. Turn the ignition switch to the "LOCK" (OFF) position.

      OK: Normal condition is displayed. 

      Q: Is the check result normal? 

      • YES:  Go to Step 4.
      • NO:  Refer to INSPECTION PROCEDURE 2: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE IGNITION SWITCH (IG1) .
        Fig 2: Connecting Scan Tool To Data Link Connector

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check ETACS-ECU connector C-309 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is ETACS-ECU connector C-309 in good condition? 

   • YES:  Go to Step 5.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the power window works normally.
5. STEP 5. Check the fusible link (34) line of power supply circuit to the ETACS-ECU. Measure the voltage at ETACS-ECU connector C-309. 
   1. Disconnect ETACS-ECU connector C-309 and measure the voltage available at the wiring harness side of the connector.
   2. Measure the voltage between terminal 1 and ground.
      • The voltage should measure approximately 12 volts (battery positive voltage).

        Q: Is the measured voltage approximately 12 volts (battery positive voltage)? 

        • YES:  Go to Step  7.
        • NO:  Go to Step 6.
          Fig 3: Measuring Voltage Between Terminal 1 & Ground

          Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Check the wiring harness between ETACS-ECU connector C-309 (terminal 1) and fusible link (34). 

   Q: Is the wiring harness between ETACS-ECU connector C-309 (terminal 1) and fusible link (34) in good condition? 

   • YES:  No action is necessary and testing is complete.
   • 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. Check that the power window works normally.
7. STEP 7. Check ETACS-ECU connector C-307 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is ETACS-ECU connector C-307 in good condition? 

   • YES:  Go to Step 8.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the power window works normally.
8. STEP 8. Check the fusible link (36) line of power supply circuit to the ETACS-ECU. Measure the voltage at ETACS-ECU connector C-307. 
   1. Disconnect ETACS-ECU connector C-307 and measure the voltage available at the wiring harness side of the connector.
   2. Measure the voltage between terminal 2 and ground.
      • The voltage should measure approximately 12 volts (battery positive voltage).

        Q: Is the measured voltage approximately 12 volts (battery positive voltage)? 

        • YES:  Go to Step  10.
        • NO:  Go to Step 9.
          Fig 4: Measuring Voltage Between Terminal 2 & Ground

          Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
9. STEP 9. Check the wiring harness between ETACS-ECU connector C-307 (terminal 2) and fusible link (36). 

   Q: Is the wiring harness between ETACS-ECU connector C-307 (terminal 2) and fusible link (36) in good condition? 

   • YES:  No action is necessary and testing is complete.
   • 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. Check that the power window works normally.
10. STEP 10. Check power window main switch connector E-15 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is power window main switch connector E-15 in good condition? 

    • YES:  Go to Step 11.
    • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the power window works normally.
11. STEP 11. Check the ETACS-ECU connector C-315 line circuit to the power window main switch. Measure the voltage at power window main switch connector E-15. 
    1. Disconnect power window main switch connector E-15 and measure the voltage available at the wiring harness side of the connector.
    2. Measure the voltage between terminal 5 and ground.
       • The voltage should measure approximately 12 volts (battery positive voltage).

         Q: Is the measured voltage approximately 12 volts (battery positive voltage)? 

         • YES:  Go to Step  14.
         • NO:  Go to Step 12.
           Fig 5: Measuring Voltage Between Terminal 5 & Ground

           Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
12. STEP 12. Check ETACS-ECU connector C-315 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is ETACS-ECU connector C-315 in good condition? 

    • YES:  Go to Step 13.
    • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the power window works normally.
13. STEP 13. Check the wiring harness between ETACS-ECU connector C-315 (terminal 10) and power window main switch connector E-15 (terminal 5). 
    NOTE: Also check intermediate connector C-128 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-128 is damaged, repair or replace the damaged component(s) as described. Refer to HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between ETACS-ECU connector C-315 (terminal 10) and power window main switch connector E-15 (terminal 5) in good condition? 

    • YES:  No action is necessary and testing is complete.
    • 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. Check that the power window works normally.
14. STEP 14. Check the ground circuit to the power window main switch. Measure the resistance at power window main switch connector E-15. 
    1. Disconnect power window main switch connector E-15 and measure the resistance available at the wiring harness side of the connector.
    2. Measure the resistance value between terminal 10 and ground.
       • The resistance should be 2 ohms or less.

         Q: Is the measured resistance 2 ohms or less? 

         • YES:  Go to Step  16.
         • NO:  Go to Step 15.
           Fig 6: Measuring Resistance Value Between Terminal 10 & Ground

           Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
15. STEP 15. Check the wiring harness between power window main switch connector E-15 (terminal 10) and ground. 
    NOTE: Also check intermediate connector C-128 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-128 is damaged, repair or replace the damaged component(s) as described. refer to HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between power window main switch connector E-15 (terminal 10) and ground in good condition? 

    • YES:  No action is necessary and testing is complete.
    • 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. Check that the power window works normally.
16. STEP 16. Retest the system. 

    Check that the all power windows work normally.

    Q: Is the check result normal? 

    • YES:  No action is necessary and testing is complete.
    • NO:  Replace ETACS-ECU. Check that the power window works normally.