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Home >> Mitsubishi >> 2003 >> Outlander LS, AWD >> 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. Measure the output circuit voltage at stoplight switch connector C- 101 (terminal 3) by backprobing. 
    1. Do not disconnect stoplight switch connector C-101.
    2. Turn the ignition switch to the "ON" position.
      Fig 1: Identifying Stoplight Switch Connector C-101
      G01864586Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Measure the voltage between terminal 3 and ground by backprobing.
      Fig 2: Measuring Voltage Between Terminal 3 And Ground By Backprobing
      G01864587Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    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.
  2. STEP 2. Check stoplight switch connector C-101. 
    Fig 3: Checking Stoplight Switch Connector C-101
    G01864588Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the connector damaged? 

    1. YES :  Repair or replace connector. Refer to, HARNESS CONNECTOR INSPECTION . Then check that diagnostic trouble code 14 is not output.
    2. NO :  Go to Step  14 .
  3. STEP 3. Measure the output circuit voltage at stoplight switch connector C- 101 (terminal 4) by backprobing. 
    1. Do not disconnect stoplight switch connector C-101.
      Fig 4: Identifying Stoplight Switch Connector C-101
      G01864589Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position and the autocruise control main switch to the "ON" position.
    3. Measure the voltage between terminal 4 and ground by backprobing.
      Fig 5: Measuring Voltage Between Terminal 4 And Ground By Backprobing
      G01864590Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the voltage approximately battery positive voltage? 

    YES :  Go to Step  6 .

    NO :  Go to Step 4.

  4. STEP 4. Check stoplight switch connector C-101. 
    Fig 6: Checking Stoplight Switch Connector C-101
    G01864591Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the connector damaged? 

    1. YES :  Repair or replace connector. Refer to, HARNESS CONNECTOR INSPECTION . Then check that diagnostic trouble code 14 is not output.
    2. NO :  Go to Step 5.
  5. STEP 5. Check the stoplight switch. 
    1. Remove the stoplight switch. Refer to, BRAKE PEDAL .
    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.
      Fig 7: Checking Continuity
      G01864592Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. The stoplight switch is in good condition if the circuit is open when the plunger is pushed in to a depth of within 4.5 mm (0.177 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. Refer to, BRAKE PEDAL . 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 autocruise control-ECU. See AUTO-CRUISE CONTROL  . Then check that diagnostic trouble code 14 is not output.
  6. STEP 6. Measure the output circuit voltage at auto-cruise control vacuum pump connector A-03 (terminal 1) by backprobing. 
    1. Do not disconnect auto-cruise control vacuum pump connector A-03.
    2. Turn the ignition switch to the "ON" position and the autocruise control main switch to the "ON" position.
      Fig 8: Identifying Auto-Cruise Control Vacuum Pump Connector A-03
      G01864593Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Measure the voltage between terminal 1 and ground by backprobing.
      Fig 9: Measuring Voltage Between Terminal 1 And Ground By Backprobing
      G01864594Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    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.
  7. STEP 7. Check auto-cruise control vacuum pump connector A-03 and intermediate connector C-14. 
    Fig 10: Identifying Auto-Cruise Control Vacuum Pump Connector A-03
    G01864595Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 11: Identifying Intermediate Connector C-14
    G01864596Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is any connector damaged? 

    1. YES :  Repair or replace connector. Refer to, HARNESS CONNECTOR INSPECTION . 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.
  8. STEP 8. Measure the output circuit voltage at auto-cruise control-ECU connector C-113 (terminals 7,8 and 16) by backprobing. 
    1. Do not disconnect auto-cruise control-ECU connector C-113.
      Fig 12: Identifying Auto-Cruise Control-ECU Connector C-113
      G01864597Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position and the autocruise control main switch to the "ON" position.
    3. Measure the voltage between terminal 7 and ground by backprobing.
      • Voltage should measure battery positive voltage. [When decelerating with the "SET" switch while driving at constant speed (Release valve open).]
      Fig 13: Measuring Voltage Between Terminal 7, 8, 16 And Ground By Backprobing
      G01864598Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Measure the voltage between terminal 8 and ground by backprobing.
      • Voltage should measure 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 measure 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 autocruise control-ECU. See AUTO-CRUISE CONTROL  . Then check that diagnostic trouble code 14 is not.
    2. NO :  Go to Step  10 .
  9. STEP 9. Check the harness wire between auto-cruise control vacuum pump connector A-03 (terminal 1) and stoplight switch connector C-101 (terminal 4). 
    Fig 14: Identifying Auto-Cruise Control Vacuum Pump Connector A-03 (Terminal 1)
    G01864599Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 15: Identifying Stoplight Switch Connector C-101 (Terminal 4)
    G01864600Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is any harness wire between auto-cruise control vacuum pump connector A- 03 (terminal 1) and stoplight switch connector C-101 (terminal 4) damaged? 

    1. YES :  Repair harness wire and then check that diagnostic trouble code 14 is not output.
    2. NO :  This malfunction is intermittent. Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - HOW TO COPE WITH INTERMITTENT MALFUNCTION . Then check that diagnostic trouble code 14 is not output.
  10. STEP 10. Check intermediate connector C-14 and autocruise control-ECU connector C-113. 
    Fig 16: Identifying Intermediate Connector C-14
    G01864601Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 17: Identifying Autocruise Control-ECU Connector C-113
    G01864602Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the connector damaged? 

    1. YES :  Repair or replace connector. Refer to HARNESS CONNECTOR INSPECTION . Then check that diagnostic trouble code 14 is not output.
    2. NO :  Go to Step 11.
  11. STEP 11. Check auto-cruise control vacuum pump connector A-03. 
    Fig 18: Identifying Auto-Cruise Control Vacuum Pump Connector A-03
    G01864603Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the connector damaged? 

    1. YES :  Repair or replace connector. Refer to HARNESS CONNECTOR INSPECTION . Then check that diagnostic trouble code 14 is not output.
    2. NO :  Go to Step 12.
  12. STEP 12. Check the auto-cruise control vacuum pump. 
    1. Disconnect the vacuum hose from the auto-cruise control vacuum pump and connect a vacuum gauge to the vacuum pump.
    2. Disconnect the vacuum pump connector.
    3. Check the auto-cruise control vacuum pump and valves according to the following procedure:
      • Connect the positive battery terminal to auto-cruise control 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.
      Fig 19: Connecting Vacuum Pump
      G01864604Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are all of the above values satisfied? 

    1. YES :  Go to Step 13.
    2. NO :  Replace the auto-cruise control vacuum pump. (Refer to AUTO-CRUISE CONTROL  .) Then check that diagnostic trouble code 14 is not output.
  13. STEP 13. Check the harness wire between auto-cruise control vacuum pump connector A-03 (terminals 2,3 and 4) and auto-cruise control-ECU connector C-113 (terminals 7,8 and 16). 
    Fig 20: Identifying Auto-Cruise Control Vacuum Pump Connector A-03 (Terminals 2, 3 And 4)
    G01864605Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 21: Identifying Auto-Cruise Control-ECU Connector C-113 (Terminals 7, 8 And 16)
    G01864606Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is any harness wire between auto-cruise control vacuum pump connector A- 03 (terminals 2, 3 and 4) and auto-cruise control-ECU connector C-113 (terminals 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 autocruise control-ECU. See AUTO-CRUISE CONTROL  . Then check that diagnostic trouble code 14 is not output.
  14. STEP 14. Measure the output circuit voltage at auto-cruise control-ECU connector C-113 (terminal 5) by backprobing. 
    1. Do not disconnect auto-cruise control-ECU connector C-113.
      Fig 22: Identifying Auto-Cruise Control-ECU Connector C-113
      G01864607Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position and the autocruise control main switch to the "ON" position.
    3. Measure the voltage between terminal 5 and ground by backprobing.
      Fig 23: Measuring Voltage Between Terminal 5 And Ground By Backprobing
      G01864608Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the voltage approximately battery positive voltage? 

    1. YES :  Go to Step 15.
    2. NO :  Go to Step  16 .
  15. STEP 15. Check the harness wire between stoplight switch connector C-101 (terminal 3) and auto-cruise control-ECU connector C-113 (terminal 5). 
    Fig 24: Identifying Stoplight Switch Connector C-101 (Terminal 3)
    G01864609Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 25: Identifying Auto-Cruise Control-ECU Connector C-113 (Terminal 5)
    G01864610Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is any harness wire between stoplight switch connector C-101 (terminal 3) and auto-cruise control-ECU connector C-113 (terminal 5) damaged? 

    1. YES :  Repair harness wire and then check that diagnostic trouble code 14 is not output.
    2. NO :  This malfunction is intermittent. Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - HOW TO COPE WITH INTERMITTENT MALFUNCTION . Then go to Step 16.
  16. STEP 16. Check auto-cruise control-ECU connector C-113. 
    Fig 26: Checking Auto-Cruise Control-ECU Connector C-113
    G01864611Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the connector damaged? 

    1. YES :  Repair or replace connector. Refer to HARNESS CONNECTOR INSPECTION . 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 autocruise control-ECU. See AUTO-CRUISE CONTROL  . Then check that diagnostic trouble code 14 is not output.
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