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DIAGNOSTIC ITEM 19: Diagnose When The Scan Tool Cannot Receive The Data Sent By A/C-ECU <Vehicles With A/C> Or Heater Control Unit <Vehicles Without A/C>: Diagnosis

Required Special Tools: 

  1. STEP 1. Check joint connector (CAN1) C-105 and A/C-ECU connector C-22 <vehicles with A/C> or heater control unit connector C-53 <vehicles without A/C> for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    CAUTION:

    The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to SERVICE PRECAUTIONS  .

    Q: Are joint connector (CAN1) C-105 and A/C-ECU connector C-22 <vehicles with A/C> or heater control unit connector C-53 <vehicles without A/C> in good condition? 

    1. YES:  Go to Step 2.
    2. NO:  Repair the damaged parts.
  2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and A/C-ECU connector C-22 <vehicles with A/C> or heater control unit connector C-53 <vehicles without A/C> for open circuit. 
    CAUTION:

    Strictly observe the specified wiring harness repair procedure. For details refer to SERVICE PRECAUTIONS  .

    1. Disconnect joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138, and check the wiring harness.
    2. Check the wiring harness between joint connector (CAN1) C-105 (terminal 6) and A/C control panel connector C-123 or heater control panel connector C-138 (terminal 7)

      OK: Continuity exists (2 Ω or less) 

      Fig 1: Measuring Resistance Between Joint Connector C-105 Terminal 6 & A/C control panel connector C-123 or heater control panel connector C-138 terminal 7
      G00537268Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Check the wiring harness between joint connector (CAN1) C-105 (terminal 17) and A/C control panel connector C-123 or heater control panel connector C-138 (terminal 8)

      OK: Continuity exists (2 Ω or less) 

      Fig 2: Measuring Resistance Between Joint Connector C-105 Terminal 17 and A/C control panel connector C-123 or heater control panel connector C-138 terminal 8
      G00537269Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138 in good condition? 

    1. YES:  Check the power supply circuit of the A/C control panel or heater control panel. Refer to DIAGNOSIS <vehicles with A/C> or DIAGNOSIS <vehicles without A/C>.
    2. NO:  Repair the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138.
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