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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-ECU connector C-22 <vehicles with A/C> or heater control unit connector C-53 <vehicles without A/C>, and check the wiring harness.
    2. Check the wiring harness between joint connector (CAN1) C-105 (terminal 6) and A/C-ECU connector C-22 <vehicles with A/C> or heater control unit connector C-53 <vehicles without A/C> (terminal 11)

      OK: Continuity exists (2 Ω or less) 

      Fig 1: Measuring Resistance Between Joint Connector C-105 Terminal 6 & A/C-ECU Connector C-22 Terminal 11
      G00527710Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Check the wiring harness between joint connector (CAN1) C-105 (terminal 17) and A/C-ECU connector C-22 <vehicles with A/C> or heater control unit connector C-53 <vehicles without A/C> (terminal 12)

      OK: Continuity exists (2 Ω or less) 

      Fig 2: Measuring Resistance Between Joint Connector C-105 Terminal 17 A/C-ECU Connector C-22 Terminal 12
      G00527791Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

      Q: Is 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> in good condition? 

      1. YES:  Check the power supply circuit of the A/C-ECU <vehicles with A/C> or heater control unit <vehicles without A/C>. 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-ECU connector C-22 <vehicles with A/C> or heater control unit connector C-53 <vehicles without A/C>.
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