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Home >> Mitsubishi >> 2003 >> Montero Sport XLS, RWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnostic Trouble Code Procedures >> DTC 26: Stoplight Switch System >> Diagnosis

DTC 26: Stoplight Switch System: Diagnosis

Required Special Tool: 

  1. STEP 1. Check the brake pedal height. 

    Refer to ADJUSTMENTS .

    Q: Is the height adjusted properly? 

    YES:  Go to Step 2.

    NO:  Adjust the brake pedal to the proper height.

  2. STEP 2. Using scan tool MB991502, check data list item 26: Stoplight Switch. 
    CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
    1. Connect scan tool MB991502 to the data link connector.
      Fig 1: Connecting Scan Tool MB991502 To Data Link Connector
      G01871772Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position.
    3. Set scan tool MB991502 to data-reading mode for item 26, Stoplight Switch.
      • When the brake pedal is depressed, the display on scan tool MB991502 should be "ON."
      • When the brake pedal is not depressed, the display on scan tool MB991502 should be "OFF."
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the switch operating properly? 

    YES:  If can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

    NO:  Go to Step 3.

  3. STEP 3. Measure the stoplight switch power supply voltage at connectors C-65 < Vehicles without auto-cruise control system >, C-66 < Vehicles with auto-cruise control system > by backprobing. 
    1. Remove the stoplight switch from the mounting bracket.
    2. Do not disconnect connector C-65 < Vehicles without auto-cruise control system > or C-66 < Vehicles with auto-cruise control system >.
      Fig 2: Locating Stoplight Switch Connector C 65 And C 66 & Terminal Identification
      G01871773Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Measure the voltage between terminal 2 and ground by backprobing.
    • The voltage should measure battery positive voltage.
      Fig 3: Measuring Voltage Between Terminal 2 And Ground By Backprobing
      G01871774Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the measured voltage battery positive voltage? 

    YES:  Go to Step  6.

    NO:  Go to step 4.

  4. STEP 4. Check stoplight switch connector C-65 < Vehicles without auto-cruise control system >, C-66 < Vehicles with auto-cruise control system > for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 4: Locating Stoplight Switch Connector C 65 And C 66 & Terminal Identification
    G01871775Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connectors and terminals in good condition? 

    YES:  Go to Step 5.

    NO:  Repair or replace the damaged components. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

  5. STEP 5. Check the harness for damage between stoplight switch connector C-65 < Vehicles without auto-cruise control system >, C-66 < Vehicles with auto-cruise control system > terminal 2 and the power supply fuse. 
    Fig 5: Locating Stoplight Switch Connector C 65 And C 66 & Terminal Identification
    G01871776Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the harness wire in good condition? 

    YES:  Go to Step 6.

    NO:  Repair or replace the harness wire.

  6. STEP 6. Measure the stoplight switch output voltage to the PCM at connector C-65 < Vehicles without auto-cruise control system >, C-66 < Vehicles with auto-cruise control system > by backprobing. 
    1. Remove the stoplight switch from the mounting bracket.
    2. Do not disconnect connector C-65 < Vehicles without auto-cruise control system > or C-66 < Vehicles with auto-cruise control system >.
      Fig 6: Locating Stoplight Switch Connector C 65 And C 66 & Terminal Identification
      G01871777Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Measure the voltage between stoplight switch connector C-65 terminal 1 and ground by backprobing < Vehicles without auto-cruise control system >.
    4. Measure the voltage between stoplight switch connector C-66 terminal 3 and ground by backprobing < Vehicles with auto-cruise control system >.
      • When the switch button is out (closed circuit), voltage should equal battery positive voltage.
      • When the switch button is depressed (open circuit), voltage should measure less than 1.0 volt.
      Fig 7: Measuring Voltage Between Stoplight Switch Connector C 65 Terminal 1, C-66 Terminal 3 And Ground By Backprobing
      G01871778Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the measured voltage battery positive voltage with the switch button released (closed circuit), and less than 1.0 volt with the switch button depressed (open circuit)? 

    YES:  Go to Step  8.

    NO:  Go to Step 7.

  7. STEP 7. Check the stoplight switch. 

    Refer to DISC & DRUM article.

    Fig 8: Checking Stop Light Switch
    G01871779Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Does the stoplight switch pass the checks? 

    YES:  Go to Step 8.

    NO:  Replace the stoplight switch. Refer to Brake Pedal .

  8. STEP 8. Measure the stoplight switch output voltage at PCM connector C-92 by backprobing. 
    1. Install the stoplight switch into the mounting bracket if it was removed.
    2. Do not disconnect connector C-92.
      Fig 9: Locating PCM Connector C 92 & Terminal Identification
      G01871780Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Measure the voltage between terminal 123 and ground by backprobing.
      • When the brake pedal is depressed, voltage should measure battery positive voltage.
      • When the brake pedal is not depressed, voltage should measure less than 1.0 volt.
      Fig 10: Measuring Voltage Between Terminal 123 And Ground By Backprobing
      G01871781Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the measured voltage battery positive voltage with the brake pedal depressed (closed circuit), and less than 1.0 volt with the brake pedal released (open circuit)? 

    YES:  Go to Step  11.

    NO:  Go to Step 9.

  9. STEP 9. Check intermediate connector C-85 and PCM connector C-92 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 11: Locating Intermediate Connector C 85 & Terminal Identification
    G01871782Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 12: Locating PCM Connector C 92 & Terminal Identification
    G01871783Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connectors and terminals in good condition? 

    YES:  Go to Step 10.

    NO:  Repair or replace the damaged components. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

  10. STEP 10. Check the harness for damage between stoplight switch connector C-65 terminal 1 and PCM connector C-92 terminal 123 < Vehicles without auto-cruise control system > or stoplight switch connector C-66 terminal 3 and PCM connector C-92 terminal 123 < Vehicles with auto-cruise control system >. 
    Fig 13: Locating Stoplight Switch Connector C 65 And C 66 & Terminal Identification
    G01871784Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 14: Locating PCM Connector C 92 & Terminal Identification
    G01871785Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the harness wire in good condition? 

    YES:  Go to Step 11.

    NO:  Repair or replace the harness wire.

  11. STEP 11. Using scan tool MB991502, check data list item 26: Stoplight Switch. 
    CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
    1. Connect scan tool MB991502 to the data link connector.
      Fig 15: Connecting Scan Tool MB991502 To Data Link Connector
      G01871786Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position.
    3. Set scan tool MB991502 to data-reading mode for item 26, Stoplight Switch.
      • When the brake pedal is depressed, the display on scan tool MB991502 should be "ON."
      • When the brake pedal is not depressed, the display on scan tool MB991502 should be "OFF."
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the switch operating properly? 

    YES:  If can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

    NO:  Replace the PCM

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