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DTC 12: Vehicle Speed Signal System: Diagnosis

Required Special Tool: 

  1. STEP 1. Check the speedometer  .

    Q: Does the speedometer work normally? 

    1. YES:  Go to Step 2.
    2. NO:  Check the speedometer circuit and repair or replace as required.

    (Refer to INSPECTION PROCEDURE 1: SPEEDOMETER DOES NOT WORK .)

  2. STEP 2. Check joint connector (1) C-77  .

    Q: Is the connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 12 is not output.

    2. NO:  Go to Step 3.
    Fig 1: Locating Joint Connector (1) C-77 (DTC 12) M/T
    G01932079Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. STEP 3. Check the harness wire between auto-cruise control ECU connector C-20 (terminal number 10) and joint connector (1) C-77 (terminal number 19)  .

    Q: Is any harness wire between auto-cruise control ECU connector C-20 (terminal number 10) and joint connector (1) C-77 (terminal number 19) damaged? 

    1. YES:  Repair the harness wire and then check that diagnostic trouble code 12 is not output.
    2. NO:  Check that diagnostic trouble code 12 is not output. If diagnostic trouble code 12 is output, replace the auto-cruise control ECU. (Refer to AUTO-CRUISE CONTROL .)

    Then check that diagnostic trouble code 12 is not output.

    Fig 2: Identifying Auto-Cruise Control ECU Connector C-20 Location (DTC 12) M/T
    G01932080Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 3: Identifying Joint Connector (1) C-77 Location (DTC 12) M/T
    G01932081Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.


Required Special Tool: 

  1. STEP 1. Check the speedometer  .

    Q: Does the speedometer work normally? 

    1. YES:  Go to Step 2.
    2. NO:  Check the speedometer circuit and repair or replace as required.

    (Refer to INSPECTION PROCEDURE 1: SPEEDOMETER DOES NOT WORK .)

  2. STEP 2. Check joint connector (1) C-77  .

    Q: Is the connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 12 is not output.

    2. NO:  Go to Step 3.
    Fig 1: Identifying Joint Connector (1) C-77 (DTC 12) A/T
    G01932083Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. STEP 3. Check the harness wire between auto-cruise control ECU connector C-20 (terminal number 10) and joint connector (1) C-77 (terminal number 19)  .

    Q: Is any harness wire between auto-cruise control ECU connector C-20 (terminal number 10) and joint connector (1) C-77 (terminal number 19) damaged? 

    1. YES:  Repair the harness wire and then check that diagnostic trouble code 12 is not output.
    2. NO:  Check that diagnostic trouble code 12 is not output. If diagnostic trouble code 12 is output, replace the auto-cruise control ECU. (Refer to AUTO-CRUISE CONTROL .)

    Then check that diagnostic trouble code 12 is not output.

    Fig 2: Identifying Auto-Cruise Control ECU Connector C-20 (DTC 12) A/T
    G01932084Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 3: Identifying Joint Connector (1) C-77 (DTC 12) A/T
    G01932085Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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