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DTC C1015: Abnormality In FR Wheel Speed Sensor Circuit: Diagnosis

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools: 

  1. STEP 1. Using scan tool MB991958, diagnose the CAN bus lines. 

    Using scan tool MB991958, diagnose the CAN bus lines.

    Q: Is the check result normal? 

    1. YES:  Go to Step  3.
    2. NO:  Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ). On completion, go to Step 2.
  2. STEP 2. DTC recheck after repairing the CAN bus line 

    Q: Is DTC No. C1015 set? 

    1. YES:  Go to Step 3.
    2. NO:  This diagnosis is complete.
  3. STEP 3. Scan tool data list 

    Check the following service data. (Refer to DATA LIST REFERENCE TABLE  .)

    • Item No. 02: FR wheel speed sensor

      Q: Is the check result normal? 

      1. YES:  Go to Step  10.
      2. NO:  Go to Step 4.
  4. STEP 4. Connector check: A-05 ASC-ECU connector, A-03 front wheel speed sensor <RH> connector 

    Q: Is the check result normal? 

    1. YES:  Go to Step 5.
    2. NO:  Repair the defective connector. Then go to Step  11.
  5. STEP 5. Voltage measurement at A-05 ASC-ECU connector 
    1. Disconnect the ASC-ECU connector, connect the special tool ASC check harness (MB991997) to the wiring harness-side connector, and then measure at the special tool connector side.
      NOTE: Do not connect the special tool to ASC-ECU.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage between the front wheel speed sensor <RH> power supply terminal (signal terminal) No. 34 and the body ground as well as between the ground terminal No. 33 and the body ground.

      OK: 1 volt or less 

      Q: Is the check result normal? 

      1. YES:  Go to Step 6.
      2. NO (Not normal at the terminal No. 34 or 33):  Go to Step  8.
        Fig 1: Measuring Voltage Between Wheel Speed Sensor Power Supply Terminal (Signal Terminal) No. 34 And Body Ground
        G05394613Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  6. STEP 6. Resistance measurement at A-05 ASC-ECU connector 
    1. Disconnect the ASC-ECU connector, connect the special tool ASC check harness (MB991997) to the wiring harness-side connector, and then measure at the special tool connector side.
      NOTE: Do not connect the special tool to ASC-ECU.
    2. Measure the resistance between the front wheel speed sensor <RH> circuit power supply terminal (signal terminal) No. 34 and the body ground as well as between the ground terminal No. 33 and the body ground.

      OK: No continuity 

      Q: Is the check result normal? 

      1. YES:  Go to Step 7.
      2. NO (Not normal at the terminal No. 34 or 33):  Go to Step  8.
        Fig 2: Measuring Resistance Between Wheel Speed Sensor Circuit Power Supply Terminal (Signal Terminal) No. 34 And Body Ground
        G05394614Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  7. STEP 7. Voltage measurement at A-05 ASC-ECU connector 
    1. Disconnect the ASC-ECU connector, connect special tool ASC check harness (MB991997) to the ASC-ECU-side connector and the wiring harness-side connector, and then measure at the special tool connector side.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage between the front wheel speed sensor <RH> circuit power supply terminal (signal terminal) No. 34 and the body ground and between the wheel speed sensor circuit ground terminal No. 33 and the body ground.

      OK: Terminal No. 34 and the body ground: Battery positive voltage 

      Terminal No. 33 and the body ground: 1 V or less 

      Q: Is the check result normal? 

      1. YES:  Go to Step 8.
      2. NO:  Go to Step  10.
        Fig 3: Measuring Voltage Between Wheel Speed Sensor Circuit Power Supply Terminal (Signal Terminal) No. 34 And Body Ground
        G05394615Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  8. STEP 8. Check of wheel speed sensor <FR> as a single unit 

    Refer to WHEEL SPEED SENSOR CURRENT CHECK  .

    Q: Is the check result normal? 

    1. YES:  Go to Step 9.
    2. NO:  Replace the wheel speed sensor <FR>. (Refer to WHEEL SPEED SENSOR  .) Then go to Step  11.
  9. STEP 9. Wiring harness check between A-05 ASC-ECU connector terminal No. 34 and A-03 front wheel speed sensor <RH> connector terminal No. 1, and between A-05 ASC-ECU connector terminal No. 33 and A-03 front wheel speed sensor <RH> connector terminal No. 2 
    • Check for short or open circuit in wheel speed sensor <RH> circuit

      Q: Is the check result normal? 

      1. YES:  Go to Step 10.
      2. NO:  Repair the wiring harness. Then go to Step  11.
  10. STEP 10. Check whether the DTC is reset. 
    1. Erase the DTC.
    2. Drive the vehicle at 12 mph (20 km/h) or more.
      NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher.

      Q: Is DTC C1015 set? 

      1. YES:  Replace the hydraulic unit (integrated with ASC-ECU). (Refer to HYDRAULIC UNIT  .) Then go to Step 11.
      2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
  11. STEP 11. Check whether the DTC is reset. 
    1. Erase the DTC.
    2. Drive the vehicle at 12 mph (20 km/h) or more.
      NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher.

      Q: Is DTC C1015 set? 

      1. YES:  Return to Step  1.
      2. NO:  This diagnosis is complete.
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