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Home >> Mitsubishi >> 2003 >> Eclipse GS, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Auto-Cruise Control System >> Auto-Cruise Control System Diagnosis >> Diagnostic Trouble Code Procedures >> DTC 14: Stoplight Switch System >> Diagnosis

DTC 14: Stoplight Switch System: Diagnosis

Required Special Tool: 

  1. STEP 1. Check the output circuit voltage at stoplight switch connector C-03 (terminal number 3) by backprobing  .
    1. Do not disconnect stoplight switch connector C-03.
    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between terminal 3 and ground by backprobing.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the voltage approximately battery positive voltage? 

    1. YES:  Go to Step  3.
    2. NO:  Go to Step 2.
    Fig 1: Checking Output Circuit Voltage At Stoplight Switch Connector C-03 Terminal 3 By Backprobing (DTC 14)
    G01932088Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  2. STEP 2. Check stoplight switch connector C-03  .

    Q: Is the connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 14 is not output.

    2. NO:  Go to Step  13.
    Fig 2: Identifying Stoplight Switch Connector C-03 (DTC 14)
    G01932089Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. STEP 3. Check the output circuit voltage at stoplight switch connector C-03 (terminal number 4) by backprobing  .
    1. Do not disconnect stoplight switch connector C-03.
    2. Turn the ignition switch to the "ON" position and the auto-cruise control main switch to the "ON" position.
    3. Measure the voltage between terminal 4 and ground by backprobing.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the voltage approximately battery positive voltage? 

    1. YES:  Go to Step  6.
    2. NO:  Go to Step 4.
    Fig 3: Checking Output Circuit Voltage At Stoplight Switch Connector C-03 Terminal 4 By Backprobing (DTC 14)
    G01932090Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  4. STEP 4. Check stoplight switch connector C-03  .

    Q: Is the connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 14 is not output.

    2. NO:  Go to Step 5.
    Fig 4: Identifying Stoplight Switch Connector C-03 (DTC 14)
    G01932091Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  5. STEP 5. Check the stoplight switch  .
    1. Disconnect stoplight switch connector C-03.
    2. Connect an ohmmeter to the stoplight switch between terminals 3 and 4, and check whether there is continuity when the plunger of the stoplight switch is pushed in and an open circuit when it is released.
    3. The stoplight switch is in good condition if the circuit is open when the plunger is pushed in to a depth of within 4 mm (0.2 inch) from the outer case edge surface, and if there is continuity when it is released.

    Q: Is the circuit is open? 

    1. YES:  Replace the stoplight switch.

      Then check that a diagnostic trouble code 14 is not output.

    2. NO:  Check that diagnostic trouble code 14 is not output. If diagnostic trouble code 14 is output, replace the auto-cruise control ECU. (Refer to AUTO-CRUISE CONTROL .) Then check that diagnostic trouble code 14 is not output.
    Fig 5: Checking Stoplight Switch (DTC 14)
    G01932092Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 6: Identifying Stoplight Switch Good Condition Position (DTC 14)
    G01932093Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  6. STEP 6. Check the output circuit voltage at auto-cruise control vacuum pump connector A-01 (terminal number 1) by backprobing  .
    1. Do not disconnect auto-cruise control vacuum pump connector A-01.
    2. Turn the ignition switch to the "ON" position and the auto-cruise control main switch to the "ON" position.
    3. Measure the voltage between terminal 1 and ground by backprobing.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the voltage approximately battery positive voltage? 

    1. YES:  Go to Step  8.
    2. NO:  Go to Step 7.
    Fig 7: Checking Output Circuit Voltage At Auto-Cruise Control Vacuum Pump Connector A-01 Terminal 1 By Backprobing (DTC 14)
    G01932094Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  7. STEP 7. Check auto-cruise control vacuum pump connector A-01 and intermediate connector C-06  .

    Q: Is any connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 14 is not output.

    2. NO:  Check the harness wire between stoplight switch connector C-03 and auto-cruise control vacuum pump connector A-01 for open circuit or damage.

      Then repair if necessary.

      Then check that diagnostic trouble code 14 is not output.

    Fig 8: Identifying Auto-Cruise Control Vacuum Pump Connector A-01 Location (DTC 14)
    G01932095Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 9: Identifying Intermediate Connector C-06 Location (DTC 14)
    G01932096Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  8. STEP 8. Check the output circuit voltage at auto-cruise control ECU connector C-20 (terminal numbers 7,8 and 16) by backprobing  .
    1. Do not disconnect auto-cruise control ECU connector C-20.
    2. Turn the ignition switch to the "ON" position and the auto-cruise control main switch to the "ON" position.
    3. Measure the voltage between terminal 7 and ground by backprobing.
      • Voltage should be battery positive voltage.

      [When decelerating with the "SET" switch while driving at constant speed (Release valve open).]

    4. Measure the voltage between terminal 8 and ground by backprobing.
      • Voltage should be battery positive voltage.

      [When decelerating with the "SET" switch while driving at constant speed. (Control valve open).]

    5. Measure the voltage between terminal 16 and ground by backprobing.
      • Voltage should be battery positive voltage.

      (When the motor is stopped during a constant road speed.)

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

    Q: Are all of the above values satisfied? 

    1. YES:  Check that diagnostic trouble code 14 is not output. If diagnostic trouble code 14 is output, replace the auto-cruise control ECU. (Refer to AUTO-CRUISE CONTROL .)

      Then check that diagnostic trouble code 14 is not.

    2. NO:  Go to Step 9.
    Fig 10: Checking Output Circuit Voltage At Auto-Cruise Control ECU Connector C-20 By Backprobing (DTC 14)
    G01932097Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  9. STEP 9. Check auto-cruise control ECU connector C-20 and intermediate connector C-94  .

    Q: Is the connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 14 is not output.

    2. NO:  Go to Step 10.
    Fig 11: Identifying Auto-Cruise Control ECU Connector C-20 Location (DTC 14)
    G01932098Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 12: Identifying Intermediate Connector C-94 (DTC 14)
    G01932099Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  10. STEP 10. Check auto-cruise control vacuum pump connector A-01  .

    Q: Is the connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 14 is not output.

    2. NO:  Go to Step 11.
    Fig 13: Identifying Auto-Cruise Control Vacuum Pump Connector A-01 Location (DTC 14)
    G01932100Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  11. STEP 11. Check the auto-cruise vacuum pump  .
    1. Disconnect the vacuum hose from the auto-cruise vacuum pump and connect a vacuum gauge to the vacuum pump.
    2. Disconnect the vacuum pump connector.
    3. Check the auto-cruise vacuum pump and valves according to the following procedure:
      • Connect the positive battery terminal to auto-cruise vacuum pump connector terminal 1, and the negative battery terminal to terminals 2, 3, and 4.

        The vacuum gauge should read 27 kPa (8.0 in Hg) or more.

      • The vacuum should be maintained when terminal 4 is disconnected from the negative battery terminal while terminals 1, 2, and 3 remain connected.

        Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal 2 is disconnected from the negative battery terminal while terminals 1, and 3 remain connected.

      • The vacuum should be maintained when terminal 4 is disconnected from the negative battery terminal while terminals 1, 2, and 3 remain connected.

        Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal 3 is disconnected from the negative battery terminal while terminals 1, and 2 remain connected.

    Q: Are all of the above values satisfied? 

    1. YES:  Go to Step 12.
    2. NO:  Replace the auto-cruise vacuum pump. (Refer to AUTO-CRUISE CONTROL .)

    Then check that diagnostic trouble code 14 is not output.

    Fig 14: Checking Auto-Cruise Vacuum Pump (DTC 14)
    G01932101Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  12. STEP 12. Check the harness wire between auto-cruise control vacuum pump connector A-01 (terminal numbers 2, 3 and 4) and auto-cruise control ECU connector C-20 (terminal numbers 7, 8 and 16)  .

    Q: Is any harness wire between auto-cruise control vacuum pump connector A-01 (terminal numbers 2,3 and 4) and auto-cruise control ECU connector C-20 (terminal numbers 7,8 and 16) damaged? 

    1. YES:  Repair harness wire and then check that diagnostic trouble code 14 is not output.
    2. NO:  Check that diagnostic trouble code 14 is not output. If diagnostic trouble code 14 is output, replace the auto-cruise control ECU. (Refer to AUTO-CRUISE CONTROL .)

    Then check that diagnostic trouble code 14 is not output.

    Fig 15: Identifying Auto-Cruise Control Vacuum Pump Connector A-01 Location (DTC 14)
    G01932102Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 16: Identifying Auto-Cruise Control ECU Connector C-20 Location (DTC 14)
    G01932103Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  13. STEP 13. Check the output circuit voltage at auto-cruise control ECU connector C-20 (terminal number 5) by backprobing  .
    1. Do not disconnect auto-cruise control ECU connector C-20.
    2. Turn the ignition switch to the "ON" position and the auto-cruise control main switch to the "ON" position.
    3. Measure the voltage between terminal 5 and ground by backprobing.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the voltage approximately battery positive voltage? 

    1. YES:  Go to Step 14.
    2. NO:  Go to Step  15.
    Fig 17: Checking Output Circuit Voltage At Auto-Cruise Control ECU Connector C-20 Terminal 5 By Backprobing (DTC 14)
    G01932104Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  14. STEP 14. Check intermediate connector C-89  .

    Q: Is the connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 14 is not output.

    2. NO:  Check the harness wire between auto-cruise control ECU connector C-20 and stoplight switch connector C-03 for open circuit or damage.

      Then repair if necessary.

      Then check that diagnostic trouble code 14 is not output.

    Fig 18: Identifying Intermediate Connector C-89 Location (DTC 14)
    G01932105Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  15. STEP 15. Check auto-cruise control ECU connector C-20  .

    Q: Is the connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 14 is not output.

    2. NO:  Check that diagnostic trouble code 14 is not output. If diagnostic trouble code 14 is output, replace the auto-cruise control ECU. (Refer to AUTO-CRUISE CONTROL .)

      Then check that diagnostic trouble code 14 is not output.

    Fig 19: Identifying Auto-Cruise Control ECU Connector C-20 Location (DTC 14)
    G01932106Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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