LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mitsubishi >> 2007 >> Eclipse SE, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Traction Control System >> Traction Control System (TCL) Diagnosis >> Diagnostic Trouble Code Procedures >> DTC C1201: Front Right Wheel Speed Sensor (Abnormal Output Signal) >> Diagnosis
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC C1201: Front Right Wheel Speed Sensor (Abnormal Output Signal): Diagnosis

Required Special Tools: 

  1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
    1. Connect scan tool MB991958 to the data link connector.
    2. Turn the ignition switch to the "ON" position.
    3. Diagnose the CAN bus line.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the CAN bus line found to be normal? 

    YES :  Go to  Step 3

    NO :  Repair the CAN bus line (Refer to DIAGNOSIS ). Then go to Step 2.

    Fig 1: Connecting Scan Tool To Data Link Connector
    G04230562Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  2. STEP 2. Recheck for diagnostic trouble code. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
    1. Turn the ignition switch to the "ON" position.
    2. Erase the DTC.
    3. Turn the ignition switch to the "LOCK" (OFF) position.
    4. Turn the ignition switch to the "ON" position.
    5. Check if the DTC is set.
    6. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is DTC C1201 set? 

    YES :  Go to Step 3

    NO :  The procedure is complete.

    Fig 2: Connecting Scan Tool To Data Link Connector
    G04230562Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. STEP 3. Using scan tool MB991958, read the diagnostic trouble code. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

    Use scan tool MB991958 to check whether DTC code C1200 have been set simultaneously.

    1. Connect scan tool MB991958 to the data link connector.
    2. Turn the ignition switch to the "ON" position.
    3. Check whether DTC C1200 have been set.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is DTC C1200 set? 

    YES :  Carry out diagnosis relevant to DTC C1200 (Refer to DTC C1200: FRONT RIGHT WHEEL SPEED SENSOR (OPEN CIRCUIT OR SHORT CIRCUIT)  ).

    NO :  Go to Step 4.

    Fig 3: Connecting Scan Tool To Data Link Connector
    G04230562Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  4. STEP 4. Check the installation condition of the wheel speed sensors. 

    For the wheel speed sensor, which the DTC code indicates, check whether the sensor or its mounting bolts are loosened.

    • DTC C1201 is set: Front right wheel speed sensor

    Q: Is the wheel speed sensor installed correctly? 

    YES :  Go to Step 5.

    NO :  Reinstall the wheel speed sensor correctly. Then go to  Step 13.

  5. STEP 5. Check the wheel speed sensor after it is removed from the vehicle. 

    Check the wheel speed sensor which the DTC code indicates (refer to REMOVAL SERVICE POINT ).

    • DTC C1201 is set: Front right wheel speed sensor

    Q: Is the wheel speed sensor in good condition? 

    YES :  Go to Step 6.

    NO :  Replace the wheel speed sensor (Refer to WHEEL SPEED SENSOR ). Then go to  Step 13.

  6. STEP 6. Check the wheel bearing for looseness. 
    NOTE: If the wheel bearing is loose, the gap between the wheel speed sensor and rotor may become excessive. Check the wheel bearing, which DTC code indicates, for looseness.

    Q: Is the wheel bearing end play within the standard value? 

    YES :  Go to Step 7.

    NO :  Replace the front hub assembly (Refer to FRONT AXLE HUB ASSEMBLY ).

  7. STEP 7. Check the wheel speed rotor. 

    Check the wheel speed rotor, which DTC code indicates, for foreign material or deformation.

    • DTC C1201 is set: Front right wheel speed sensor

    Q: Is the wheel speed rotor in good condition? 

    YES :  Go to Step 8.

    NO :  If the wheel speed rotor is contaminated with foreign material, clean it. If the driveshaft is deformed, replace it (Refer to DRIVE SHAFT ASSEMBLY ).

  8. STEP 8. Measure the voltage at ABS/TCL-ECU connector A-03. 
    1. Disconnect the connector A-03, and connect special tool MB991997 to the wiring harness-side connector.
      NOTE: DO NOT connect special tool MB991997 to the ABS/ASC-ECU.
    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between terminal 33 and body ground, and between terminal 34 and body ground. It should be 1V or less.

    Q: Does the voltage measure 1 V or less? 

    YES :  Go to Step 9.

    NO :  Go to  Step 11.

    Fig 4: Measuring Voltage Between Terminal No. 33 & Body Ground
    G04232176Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  9. STEP 9. Measure the resistance at ABS/TCL-ECU connector A-03. 
    1. Disconnect the connector A-03, and connect special tool MB991997 to the wiring harness-side connector.
      NOTE: DO NOT connect special tool MB991997 to the ABS/TCL-ECU.
    2. Measure the resistance between terminal 33 and body ground, and between terminal 34 and body ground. There should be no continuity.

    Q: Does continuity exist? 

    YES :  Go to  Step 11.

    NO :  Go to Step 10.

    Fig 5: Measuring Resistance Between Terminals No. 33, 34 & Body Ground
    G04232177Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  10. STEP 10. Measure the resistance at ABS/TCL-ECU connector A-03. 
    1. Disconnect the connector A-03, and connect special tool MB991997 to the wiring harness-side connector.
      NOTE: DO NOT connect special tool MB991997 to the ABS/TCL-ECU.
    2. Measure the resistance between terminal 33 and terminal 34.

      Standard Value: 1.24 - 1.64 kΩ 

    Q: Is the resistance between terminals 33 and 34 within the standard value? 

    YES :  Go to  Step 12.

    NO :  Go to Step 11.

    Fig 6: Measuring Resistance Between Terminals No. 33 & 34
    G04232178Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  11. STEP 11. Check ABS/TCL-ECU connector A-03 and wheel speed sensor < front: RH > connector A-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are ABS/TCL-ECU connector A-03 and wheel speed sensor < front: RH > connector A-01 damaged? 

    YES :  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Then go to  Step 13.

    NO :  Open or short circuit may be present in the front right wheel speed sensor circuit. Repair the wiring harness between ABS/TCL-ECU connector A-03 (terminals 33 and 34) and front right wheel speed sensor A-01 (terminals 1 and 2). Then go to  Step 13.

    Fig 7: Identifying Wheel Speed Sensor Connector A-01
    G04232179Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 8: Identifying Connector A-03 Terminals
    G04232263Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  12. STEP 12. Recheck for diagnostic trouble code. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

    Check again if the DTC is set.

    1. Turn the ignition switch to the "ON" position.
    2. Erase the DTC.
    3. Turn the ignition switch to the "LOCK" (OFF) position.
    4. Turn the ignition switch to the "ON" position.
    5. Check if the DTC is set.
    6. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is DTC C1201 set? 

    YES :  Replace the hydraulic unit (integrated with ABS/TCL-ECU). Then go to Step 13.

    NO :  It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION .

    Fig 9: Connecting Scan Tool To Data Link Connector
    G04230562Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  13. STEP 13. Recheck for diagnostic trouble code. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

    Check again if the DTC is set.

    1. Turn the ignition switch to the "ON" position.
    2. Erase the DTC.
    3. Turn the ignition switch to the "LOCK" (OFF) position.
    4. Turn the ignition switch to the "ON" position.
    5. Check if the DTC is set.
    6. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is DTC C1201 set? 

    YES :  Go to  Step 1.

    NO :  The procedure is complete.

    Fig 10: Connecting Scan Tool To Data Link Connector
    G04230562Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
scientia non olet · About LEMON Manuals