INSPECTION PROCEDURE 1: Even when the equipment (power consumption is 100 W or less) is connected, the equipment cannot be used.: Diagnosis

Required Special Tools: 

• MB991223: Harness set
• MB 992006: Extra fine probe

1. STEP 1. Check AC inverter connector D-128 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is AC inverter connector D-128 in good condition? 

   YES:  Go to Step 2.

   NO:  Repair the damaged parts.

2. STEP 2. Measure the voltage at AC inverter connector D-128. 
   1. Disconnect AC inverter connector D-128, and measure the voltage wiring harness side.
   2. Measure the voltage between AC inverter connector D-128 (terminal No. 1) and the body ground.
      • The voltage should measure approximately 12 volts (battery positive voltage).

   Q: Does the voltage measure battery voltage? 

   YES:  Go to  Step 5.

   NO:  Go to Step 3.

   Fig 1: Measuring Voltage Between AC Inverter Connector D-128 (Terminal No. 1) And Body Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the wiring harness between AC inverter connector D-128 (terminal No. 1) and fusible link (34). 
   NOTE: Before the wiring harness check, check intermediate connector C-32 and C-35, ETACS-ECU connector C-308, and then repair them if necessary.

   Q: Is the wiring harness between AC inverter connector D-128 (terminal No. 1) and fusible link (34) in good condition? 

   YES:  Go to Step 4.

   NO:  Repair the wiring harness between AC inverter connector D-128 and fusible link (34).

4. STEP 4. Retest the system 

   Q: Is the check result normal? 

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

   NO:  Carry out the troubleshooting again.

5. STEP 5. Measure the voltage at AC inverter connector D-128. 
   1. Disconnect the connector, and measure at the wiring harness side.
   2. Turn the ignition switch to the "ON" position.
   3. Measure the voltage between AC inverter connector D-128 (terminal No. 3) and the body ground.
      • The voltage should measure approximately 12 volts (battery positive voltage).

   Q: Does the voltage measure battery voltage? 

   YES:  Go to  Step 8.

   NO:  Go to Step 6.

   Fig 2: Measuring Voltage Between AC Inverter Connector D-128 (Terminal No. 3) And Body Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Check the wiring harness between AC inverter connector D-128 (terminal No. 3) and ETACS-ECU connector C-313 (terminal No. 2). 

   Q: Is the wiring harness between AC inverter connector D-128 (terminal No. 3) and ETACS-ECU connector C-313 (terminal No. 2) in good condition? 

   YES:  Go to Step 7.

   NO:  Repair the wiring harness between AC inverter connector D-128 and ETACS-ECU C-313.

7. STEP 7. Retest the system 

   Q: Is the check result normal? 

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

   NO:  Carry out the troubleshooting again.

8. STEP 8. Measure the resistance at AC inverter connector D-128. 
   1. Disconnect the AC inverter connector D-128, and measure at the wiring harness side.
   2. Measure the resistance between AC inverter connector D-128 (terminal No. 7) and the body ground.
      • The measured value should be continuity exists (2 Ω or less).

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

   YES:  Go to  Step 11.

   NO:  Go to Step 9.

   Fig 3: Measuring Resistance Between AC Inverter Connector D-128 (Terminal No. 7) And Body Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
9. STEP 9. Check the wiring harness between AC inverter connector D-128 (terminal No. 7) and the body ground. 

   Q: Is the wiring harness between AC inverter connector D-128 (terminal No. 7) and the body ground in good condition? 

   YES:  Go to Step 10.

   NO:  Repair the wiring harness between AC inverter connector D-128 and the body ground.

10. STEP 10. Retest the system 

    Q: Is the check result normal? 

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

    NO:  Carry out the troubleshooting again.

11. STEP 11. Check AC outlet connector D-103 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is AC outlet connector D-103 in good condition? 

    YES:  Go to Step 12.

    NO:  Repair the damaged parts.

12. STEP 12. Measure the resistance at AC inverter connector D-128 and AC outlet connector D-103. 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Measure the resistance between AC inverter connector D-128 (terminal No. 4) and AC outlet connector D-103 (terminal No. 3).
       • The measured value should be 2 Ω or less.
         Fig 4: Measuring Resistance Between AC Inverter Connector D-128 (Terminal No. 4) And AC Outlet Connector D-103 (Terminal No. 3)

         Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Measure the resistance between AC inverter connector D-128 (terminal No. 11) and AC outlet connector D-103 (terminal No. 1).
       • The measured value should be 2 Ω or less.

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

    YES:  Go to  Step 14.

    NO:  Go to Step 13.

    Fig 5: Measuring Resistance Between AC Inverter Connector D-128 (Terminal No. 11) And AC Outlet Connector D-103 (Terminal No. 1)

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
13. STEP 13. Check the wiring harness between AC inverter connector D-128 (terminal No. 4, 11) and AC outlet connector D-103 (terminal No. 3, 1). 

    Q: Is the wiring harness between AC inverter connector D-128 (terminal No. 4, 11) and AC outlet connector D-103 (terminal No. 3, 1) in good condition? 

    YES:  Go to Step 14.

    NO:  Repair the wiring harness between AC inverter connector D-128 and AC outlet connector D-103.

14. STEP 14. Retest the system 

    Q: After the AC outlet replacement, does the AC power supply operate normally? 

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

    NO:  Replace the AC inverter.