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Home >> Mitsubishi >> 2004 >> Lancer Evolution >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 39 (Auto-Cruise Control System - 2.0L (Except Evolution & SPORTBACK)) >> 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

WARNING: This page is about a different variant/trim than selected.

Required Special Tool: 

  1. STEP 1. Measure the 12-Volt supply circuit voltage at auto-cruise control switch connector C-202. 
    Fig 1: Disconnecting Auto-Cruise Control Switch Connector C-202
    G00809557Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    1. Disconnect auto-cruise control switch connector C-202.
    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between auto-cruise control switch connector C-202 terminal 1 and ground.
      • The measured voltage should measure battery positive voltage.
      Fig 2: Measuring Voltage Between Auto-Cruise Control Switch
      G00809558Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Turn the ignition switch to the "LOCK" (OFF) position, connect auto-cruise control switch connector C-202.

    Q: Is the measured voltage 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-202 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 3: Checking Auto-Cruise Control Switch Connector C-202
    G00809559Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connector and terminals in good condition? 

    1. YES :  Go to Step 3.
    2. NO :  Repair or replace connector. Then check that diagnostic trouble code 15 is not output.
  3. STEP 3. Check the clock spring. 

    Refer to DRIVER-SIDE AIR BAG MODULE & CLOCKSPRING .

    Q: Is the clock spring in good condition? 

    1. YES :  Go to Step 4.
    2. NO :  Replace the clock spring (Refer to DRIVER-SIDE AIR BAG MODULE & CLOCKSPRING ). Then check that diagnostic trouble code 15 is not output.
  4. STEP 4. Check intermediate connector C-229-1, clock spring connectors C-204 and C-229 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 4: Checking Intermediate Connector C-229-1 Clock Spring Connectors C-204 And C-229
    G00809560Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connectors and terminals in good condition? 

    1. YES :  Go to Step 5.
    2. NO :  Repair or replace connector. Then check that diagnostic trouble code 15 is not output.
  5. STEP 5. Check the harness wire between junction block (fuse 2) and auto-cruise control switch connector C-202 terminal 1 for damage. 
    Fig 5: Checking Harness Wire Between Junction Block (Fuse 2)
    G00809561Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the harness wire in good condition? 

    1. YES :  This malfunction is intermittent (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). Then check that diagnostic trouble code 15 is not output.
    2. NO :  Repair harness wire and then check that diagnostic trouble code 15 is not output.
  6. STEP 6. Measure the signal voltage at auto-cruise control switch connector C-202 by backprobing. 
    Fig 6: Disconnecting Auto-Cruise Control Switch Connector C-202
    G00809562Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    1. Do not disconnect auto-cruise control switch connector C-202.
    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between auto-cruise control switch connector C-202 terminal 2 and ground by backprobing.
      • Voltage should measure battery positive voltage. (MAIN switch is at the "ON" position.)
        • Fig 7: Measuring Signal Voltage At Auto-Cruise Control Switch Connector C-202
        G00809563Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Measure the voltage between terminal 3 and ground by backprobing.
      • Voltage should measure between 6.8 and 7.2 volts. (MAIN switch is at the "ON" position.)
      • Voltage should measure between 3.5 and 5.0 volts. (All switches are at the "OFF" position.)
      • Voltage should measure between 0.4 and 2.3 volts. ("SET" switch is at the "ON" position)
      • Voltage should measure between 2.3 and 3.5 volts. ("RESUME" switch is at the "ON" position.)
      • Voltage should measure between 1 volt or less. ("CANCEL" switch is at the "ON" position.)
    5. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Are all of the measured voltages satisfied? 

    1. YES :  Go to  Step 9.
    2. NO :  Go to Step 7.
  7. STEP 7. Check auto-cruise control switch connector C-202 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 8: Checking Auto-Cruise Control Switch Connector C-202
    G00809564Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connector and terminals in good condition? 

    1. YES :  Go to Step 8.
    2. NO :  Repair or replace connector. Then check that diagnostic trouble code 15 is not output.
  8. STEP 8. Check the auto-cruise control switch. 
    1. Remove the auto-cruise control switch (Refer to AUTO-CRUISE CONTROL ).
    2. Measure the resistance between the terminals when each of the "CRUISE" (MAIN), "COAST/SET", "ACC/RES" and "CANCEL" switch is pressed.
      Fig 9: Checking Auto-Cruise Control Switch
      G00809566Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 10: Identifying Resistance Between The Terminals Chart
      G00809565Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the measured values 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. Measure the signal voltage at auto-cruise control-ECU connector C-107 by backprobing. 
    1. Remove the auto-cruise control-ECU mounting nut (Refer to AUTO-CRUISE CONTROL ).
      Fig 11: Removing Auto-Cruise Control-ECU Mounting Nut
      G00809567Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Do not disconnect auto-cruise control-ECU connector C-107.
    3. Turn the ignition switch to the "ON" position.
    4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal 12 and ground by backprobing.
      • Voltage should measure battery positive voltage. (The MAIN switch is at the "ON" position.)
      Fig 12: Measuring Voltage Between Auto-Cruise Control-ECU Connector C-107
      G00809568Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    5. Measure the voltage between auto-cruise control-ECU connector C-107 terminal 9 and ground by backprobing.
      • Voltage should measure between 6.8 and 7.2 volts. (MAIN switch is at the "ON" position.)
      • Voltage should measure between 3.5 and 5.0 volts. (All switches are at the "OFF" position.)
      • Voltage should measure between 0.4 and 2.3 volts. ("SET" switch is at the "ON" position.)
      • Voltage should measure between 2.3 and 3.5 volts. ("RESUME" switch is at the "ON" position.)
      • Voltage should measure between 1 volt or less. ("CANCEL" switch is at the "ON" position.)
    6. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Are all of the measured voltages satisfied? 

    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-107 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 13: Checking Auto-Cruise Control-ECU Connector C-107
    G00809569Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connector and terminals in good condition? 

    1. YES :  Go to Step 11.
    2. NO :  Repair or replace connector. Then check that diagnostic trouble code 15 is not output.
  11. STEP 11. Check the clock spring. 

    Refer to DRIVER-SIDE AIR BAG MODULE & CLOCKSPRING .

    Q: Is the clock spring in good condition? 

    1. YES :  Go to Step 12.
    2. NO :  Replace the clock spring (Refer to DRIVER-SIDE AIR BAG MODULE & CLOCKSPRING ). Then check that diagnostic trouble code 15 is not output.
  12. STEP 12. Check auto-cruise control switch connector C-202, intermediate connector C-229-1 and C-108 and clock spring connectors C-204 and C-229 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 14: Checking Auto-Cruise Control Switch Connector C-202
    G00809570Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 15: Identifying Connector C-108
    G00809571Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connectors and terminals in good condition? 

    1. YES :  Go to Step 13.
    2. NO :  Repair or replace connector. Then check that diagnostic trouble code 15 is not output.
  13. STEP 13. Check the harness wires between auto-cruise control switch connector C-202 terminal 2, 3 and auto-cruise control-ECU connector C-107 terminal 12, 9 for damage. 
    Fig 16: Checking Harness Wires Between Auto-Cruise Control Switch Connector C-202
    G00809572Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 17: Identifying Auto-Cruise Control-ECU Connector C-107
    G00809573Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the harness wires in good condition? 

    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 :  Repair harness wire and then check that diagnostic trouble code 15 is not output.
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