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Home >> Mitsubishi >> 2003 >> Eclipse RS, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Auto-Cruise Control System >> Auto-Cruise Control System Diagnosis >> Diagnostic Trouble Code Procedures >> DTC 15: Auto-cruise Control Switch System >> Diagnosis

DTC 15: Auto-cruise Control Switch System: Diagnosis

Required Special Tool: 

  1. STEP 1. Check the 12-Volt supply circuit voltage at auto-cruise control switch connector C-82 (terminal number 1)  .
    1. Disconnect auto-cruise control switch connector C-82 and measure at the harness side.
    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between terminal 1 and ground.
    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 2.
    Fig 1: Checking Circuit Voltage At Auto-Cruise Control Switch Connector C-82 (DTC 15)
    G01932108Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  2. STEP 2. Check auto-cruise control switch connector C-82  .

    Q: Is the connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 15 is not output.

    2. NO:  Go to Step 3.
    Fig 2: Identifying Auto-Cruise Control Switch Connector C-82 Location (DTC 15)
    G01932109Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. STEP 3. Check the clock spring  .

    Refer to AIR BAG RESTRAINT SYSTEMS article.

    Q: Is the clock spring damaged? 

    1. YES:  Replace the clock spring.

      Refer to AIR BAG RESTRAINT SYSTEMS article.

      Then check that diagnostic trouble code 15 is not output.

    2. NO:  Go to Step 4.
  4. STEP 4. Check clock spring connector C-84  .

    Q: Is any connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 15 is not output.

    2. NO:  Go to Step 5.
    Fig 3: Identifying Clock Spring Connector C-84 Location (DTC 15)
    G01932110Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  5. STEP 5. Check clock spring connector C-96  .

    Q: Is any connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 15 is not output.

    2. NO:  Check the harness wire between multi-purpose fuse No.21 and auto-cruise control switch connector C-82 for open circuit or damage.

      Then repair if necessary.

      Then check that diagnostic trouble code 15 is not output.

    Fig 4: Identifying Clock Spring Connector C-96 Location (DTC 15)
    G01932111Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  6. STEP 6. Check the output circuit voltage at auto-cruise control switch connector C-82 (terminal numbers 2 and 3) by backprobing  .
    1. Do not disconnect auto-cruise control switch connector C-207.
    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between terminal 2 and ground by backprobing.
      • Voltage should be battery positive voltage.

        (MAIN switch is at the "ON" position.)

    4. Measure the voltage between terminal 3 and ground by backprobing.
      • Voltage should be between 6.8 and 7.2 volts.

        (MAIN switch is at the "ON" position.)

      • Voltage should be between 3.5 and 5.0 volts.

        (All switches are at the "OFF" position.)

      • Voltage should be between 0.4 and 2.3 volts.

        ("SET" switch is at the "ON" position)

      • Voltage should be between 2.3 and 3.5 volts.

        ("RESUME" switch is at the "ON" position.)

      • Voltage should be between 1 volt or less.

        ("CANCEL" switch is at the "ON" position.)

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

    Q: Is the voltage within specifications? 

    1. YES:  Go to Step  9.
    2. NO:  Go to Step 7.
    Fig 5: Checking Output Circuit Voltage At Auto-Cruise Control Switch Connector C-82 By Backprobing (DTC 15)
    G01932112Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  7. STEP 7. Check auto-cruise control switch connector C-82  .

    Q: Is the connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 15 is not output.

    2. NO:  Go to Step 8.
    Fig 6: Identifying Auto-Cruise Control Switch Connector C-82 Location (DTC 15)
    G01932113Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  8. STEP 8. Check the auto-cruise control switch  .
    1. Disconnect auto-cruise control switch. (Refer to AUTO-CRUISE CONTROL .)
    2. Measure the resistance between the terminals when each of the "SET," "RESUME," "CANCEL" and MAIN switch is pressed.
      Fig 7: Auto-Cruise Control Switch Resistance Reference Table (DTC 15)
      G01932114Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the values measured correspond to those in the table below? 

    1. YES:  Check that diagnostic trouble code 15 is not output. If diagnostic trouble code 15 is output, replace the auto-cruise control ECU. (Refer to AUTO-CRUISE CONTROL .)

      Then check that diagnostic trouble code 15 is not output.

    2. NO:  Replace the auto-cruise control switch. (Refer to AUTO-CRUISE CONTROL .)

      Then check that diagnostic trouble code 15 is not output.

    Fig 8: Checking Auto-Cruise Control Switch (DTC 15)
    G01932115Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  9. STEP 9. Check the output circuit voltage at auto-cruise control ECU connector C-20 (terminal numbers 9 and 12) by backprobing  .
    1. Do not disconnect auto-cruise control ECU connector C-20.
    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between terminal 12 and ground by backprobing.
      • Voltage should be battery positive voltage.

        (The MAIN switch is at the "ON" position.)

    4. Measure the voltage between terminal 9 and ground by backprobing.
      • Voltage should be between 6.8 and 7.2 volts.

        (MAIN switch is at the "ON" position.)

      • Voltage should be between 3.5 and 5.0 volts.

        (All switches are at the "OFF" position.)

      • Voltage should be between 0.4 and 2.3 volts.

        ("SET" switch is at the "ON" position.)

      • Voltage should be between 2.3 and 3.5 volts.

        ("RESUME" switch is at the "ON" position.)

      • Voltage should be between 1 volt or less.

        ("CANCEL" switch is at the "ON" position.)

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

    Q: Is the voltage within specifications? 

    1. YES:  Check that diagnostic trouble code 15 is not output. If diagnostic trouble code 15 is output, replace the auto-cruise control ECU. (Refer to AUTO-CRUISE CONTROL .)

      Then check that diagnostic trouble code 15 is not output.

    2. NO:  Go to Step 10.
    Fig 9: Checking Output Circuit Voltage At Auto-Cruise Control ECU Connector C-20 By Backprobing (DTC 15)
    G01932116Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  10. STEP 10. 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 15 is not output.

    2. NO:  Go to Step 11.
    Fig 10: Identifying Auto-Cruise Control ECU Connector C-20 Location (DTC 15)
    G01932117Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  11. STEP 11. Check the clock spring  .

    Refer to AIR BAG RESTRAINT SYSTEMS article.

    Q: Is the clock spring damaged? 

    1. YES:  Replace the clock spring.

      Refer to AIR BAG RESTRAINT SYSTEMS article.

      Then check that diagnostic trouble code 15 is not output.

    2. NO:  Go to Step 12.
  12. STEP 12. Check auto-cruise control switch connector C-82, clock spring connector C-84 and C-96  .

    Q: Is any connector damaged? 

    1. YES:  Repair or replace connector.

      Then check that diagnostic trouble code 15 is not output.

    2. NO:  Go to Step 13.
    Fig 11: Identifying Auto-Cruise Control Switch Connector C-82, Clock Spring Connector C-84 And C-96 Location (DTC 15)
    G01932118Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  13. STEP 13. Check the harness wire between auto-cruise control switch connector C-82 (terminal numbers 2 and 3) and auto-cruise control ECU connector C-20 (terminal numbers 9 and 12)  .

    Q: Is any harness wire between auto-cruise control switch connector C-82 (terminal numbers 2 and 3) and auto-cruise control ECU connector C-20 (terminal numbers 9 and 12) damaged? 

    1. YES:  Repair harness wire and then check that diagnostic trouble code 15 is not output.
    2. NO:  Check that diagnostic trouble code 15 is not output. If diagnostic trouble code 15 is output, replace the auto-cruise control ECU. (Refer to AUTO-CRUISE CONTROL .) Then check that diagnostic trouble code 15 is not output.
    Fig 12: Identifying Auto-Cruise Control ECU Connector C-20 Location (DTC 15)
    G01932119Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 13: Identifying Auto-Cruise Control Switch Connector C-82 Location (DTC 15)
    G01932120Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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