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Home >> Mitsubishi >> 2005 >> Eclipse GT, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Auto-Cruise Control >> 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.
      Fig 1: Measuring Voltage Between Terminal 1 And Ground
      G02424861Courtesy 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 6.
    2. NO  : Go to Step 2.
  2. STEP 2. Check auto-cruise control switch connector C-82. 
    Fig 2: Identifying Auto-Cruise Control Switch Connector C-82
    G02424862Courtesy 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 15 is not output.
    2. NO  : Go to Step 3.
  3. STEP 3. Check the clock spring. 

    Refer to , AIR BAG MODULES AND CLOCK SPRING .

    Q: Is the clock spring damaged? 

    1. YES  : Replace the clock spring. Refer to , AIR BAG MODULES AND CLOCK SPRING . 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. 
    Fig 3: Identifying Clock Spring Connector C-84
    G02424863Courtesy 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 15 is not output.
    2. NO  : Go to Step 5.
  5. STEP 5. Check clock spring connector C-96. 
    Fig 4: Identifying Clock Spring Connector C-96
    G02424864Courtesy 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 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.
  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.)
        • Fig 5: Measuring Voltage Between Terminal 2 or 3 And Ground
        G02424865Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    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.
  7. STEP 7. Check auto-cruise control switch connector C-82. 
    Fig 6: Identifying Auto-Cruise Control Switch Connector C-82
    G02424866Courtesy 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 15 is not output.
    2. NO  : Go to Step 8.
  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: Checking Auto-Cruise Control-ECU Switch
      G02424867Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      TERMINALS CONNECTOR SPECIFICATION

      SWITCH POSITION TERMINAL CONNECTOR OF TESTER SPECIFIED CONDITION
      "MAIN" switch "OFF" 1 - 2 Open circuit
      "MAIN" switch "ON" 1 - 2 Approximately 3.9 kΩ
      "CANCEL" switch "ON" 2 - 3 Less than 2 ohms
      "RESUME" switch "ON" 2 - 3 Approximately 910 Ω
      "SET" switch "ON" 2 - 3 Approximately 220 Ω

    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.
  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.)
        • Fig 8: Measuring Voltage Between Terminal 9 Or 12 And Ground
        G02424868Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    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.
  10. STEP 10. Check auto-cruise control-ECU connector C-20. 
    Fig 9: Identifying Auto-Cruise Control-ECU Connector C-20
    G02424869Courtesy 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 15 is not output.
    2. NO  : Go to Step 11.
  11. STEP 11. Check the clock spring. 

    Refer to , AIR BAG MODULES AND CLOCK SPRING .

    Q: Is the clock spring damaged? 

    1. YES  : Replace the clock spring. Refer to , AIR BAG MODULES AND CLOCK SPRING . 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. 
    Fig 10: Identifying Auto-Cruise Control Switch Connector C-82,Clock Spring Connector C-84 And C-96
    G02424870Courtesy 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 15 is not output.
    2. NO  : Go to Step 13.
  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). 
    Fig 11: Identifying Auto-Cruise Control-ECU Connector C-20
    G02424871Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 12: Identifying Harness Wire Between Auto-Cruise Control Switch Connector C-82
    G02424872Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    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.
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