VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1235/35, C1236/36, C1238/38, C1239/39, C1275/75, C1276/76, C1277/77, C1278/78

DTC Code DTC Name
C1235/35 Foreign Object is Attached on Tip of Front Speed Sensor RH
C1236/36 Foreign Object is Attached on Tip of Front Speed Sensor LH
C1238/38 Foreign Object is Attached on Tip of Rear Speed Sensor RH
C1239/39 Foreign Object is Attached on Tip of Rear Speed Sensor LH
C1275/75 Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)
C1276/76 Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)
C1277/77 Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1278/78 Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)

DESCRIPTION

The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for the ABS control system. This speed sensor contains a sensor IC, which consists of 2 MREs (Magnetic Resistance Elements). The speed sensor rotor, which consists of 48 sets of N and S poles arranged in a circle, is integrated with the inner race of the hub bearing.

To detect the rotation direction, the output waves are used to determine the relationship of the pulses that are generated by the 2 MREs. Upon receiving this signal, the sensor IC outputs a forward or backward waveform to the ECU.

When foreign matter adheres to the speed sensor tip or rotor these DTCs are output. An abnormal waveform input from the sensor determines these conditions.

These DTCs may be detected when a malfunction occurs in the connector terminals or wire harness of the speed sensor circuit.

DTCs C1275/75 to C1278/78 will be deleted when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs from C1275/75 to C1278/78 are output only in Test Mode.

A0162H7E06
DTC Code DTC Detection Condition Trouble Area

C1235/35

C1236/36

C1238/38

C1239/39

Either of the following is detected:


  1. At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signal from the abnormal wheel for 5 seconds or more.

  2. At a vehicle speed of 10 km/h (6 mph) or more, noise is input once per rotor rotation for 15 seconds or more.

  • Speed sensor

  • Sensor installation

  • Speed sensor rotor

  • Skid control ECU

C1275/75

C1276/76

C1277/77

C1278/78

 Detected only during Test Mode. Speed sensor rotor

Tech Tips


  • DTCs C1235/35 and C1275/75 are for the front speed sensor RH.

  • DTCs C1236/36 and C1276/76 are for the front speed sensor LH.

  • DTCs C1238/38 and C1277/77 are for the rear speed sensor RH.

  • DTCs C1239/39 and C1278/78 are for the rear speed sensor LH.

WIRING DIAGRAM

A01636WE01

INSPECTION PROCEDURE

Note

When replacing the skid control ECU, perform zero point calibration and store system information Click here.

Tech Tips

When C0200/31, C0205/32, C0210/33, and/or C0215/34 is output together with C1235/35, C1236/36, C1238/38, and/or C1239/39, inspect and repair the trouble areas indicated by C0200/31, C0205/32, C0210/33, and/or C0215/34 first Click here for front, or Click here for rear).

PROCEDURE


  1. CHECK SPEED SENSOR AND SPEED SENSOR ROTOR SERRATIONS


    1. A0160RTE04

      Connect the oscilloscope to each speed sensor terminal of the skid control ECU.

    2. Check waveform output when the wheel is rotated.

      OK
      The same waveform is output from all the 4 wheels and there is no noise or interference in the waveform.

    3. Check that the waveform does not change while jiggling a connector or a wire harness.

      OK
      The waveform does not change.

      Tech Tips


      • As the vehicle speed (wheel revolution speed) increases, a cycle of the waveform narrows and the output voltage becomes greater.

      • When noise is identified in the waveform on the oscilloscope, the erratic signals are generated due to speed sensor rotor scratches, looseness or foreign matter attached to it.

      Result
      Result Proceed to
      OK A
      NG (for front) B
      NG (for rear) C

    B

    CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE) Click here

    C

    CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE) Click here

    A

  2. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

    5. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTCs (C1235/35, C1236/36, C1238/38 and C1239/39) are not output A
      DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output B

    B

    REPLACE SKID CONTROL ECU Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)


    1. A0163C0E03

      Turn the engine switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    3. Disconnect the skid control sensor wire.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      V1 ("A"-2) - V1 ("B"-1) Always Below 1 Ω
      V1 ("A"-2) - V1 ("B"-2) Always 10 kΩ or higher
      V1 ("A"-2) - Body ground Always 10 kΩ or higher
      V1 ("A"-1) - V1 ("B"-2) Always Below 1 Ω
      V1 ("A"-1) - V1 ("B"-1) Always 10 kΩ or higher
      V1 ("A"-1) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      W1 ("A"-2) - W1 ("B"-2) Always Below 1 Ω
      W1 ("A"-2) - W1 ("B"-1) Always 10 kΩ or higher
      W1 ("A"-2) - Body ground Always 10 kΩ or higher
      W1 ("A"-1) - W1 ("B"-1) Always Below 1 Ω
      W1 ("A"-1) - W1 ("B"-2) Always 10 kΩ or higher
      W1 ("A"-1) - Body ground Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement Click here.


    NG

    REPLACE SKID CONTROL SENSOR WIRE

    OK

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)


    1. A0163CWE04

      Reconnect the skid control sensor wire.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    3. Disconnect the skid control ECU connector and the front speed sensor connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A35*1, J98*2-8 (FR+) - V1-2 (FR+) Always Below 1 Ω
      A35*1, J98*2-8 (FR+) - Body ground Always 10 kΩ or higher
      A35*1, J98*2-7 (FR-) - V1-1 (FR-) Always Below 1 Ω
      A35*1, J98*2-7 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A35*1, J98*2-9 (FL+) - W1-2 (FL+) Always Below 1 Ω
      A35*1, J98*2-9 (FL+) - Body ground Always 10 kΩ or higher
      A35*1, J98*2-10 (FL-) - W1-1 (FL-) Always Below 1 Ω
      A35*1, J98*2-10 (FL-) - Body ground Always 10 kΩ or higher

      *1: for LHD

      *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. RECONFIRM DTC


    1. Reconnect the skid control ECU connector and the front speed sensor connector.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

    5. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output A
      DTCs (C1235/35, C1236/36, C1238/38 and C1239/39) are not output B

    B

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

    A

  6. REPLACE FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR


    1. Turn the engine switch off.

    2. Replace the front speed sensor Click here.

    3. Replace the front axle hub sub-assembly (front speed sensor rotor) Click here.

      Tech Tips

      The front speed sensor rotor is incorporated into the front axle hub sub-assembly.

      If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly with front speed sensor.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  7. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

    4. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output A
      DTCs (C1235/35, C1236/36, C1238/38 and C1239/39) are not output B

    B

    END

    A

    REPLACE SKID CONTROL ECU Click here

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)


    1. A015ZHOE03

      Turn the engine switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    3. Disconnect the skid control sensor wire.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      X1 ("A"-2) - X1 ("B"-4) Always Below 1 Ω
      X1 ("A"-2) - X1 ("B"-5) Always 10 kΩ or higher
      X1 ("A"-2) - Body ground Always 10 kΩ or higher
      X1 ("A"-1) - X1 ("B"-5) Always Below 1 Ω
      X1 ("A"-1) - X1 ("B"-4) Always 10 kΩ or higher
      X1 ("A"-1) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      Y1 ("A"-2) - Y1 ("B"-4) Always Below 1 Ω
      Y1 ("A"-2) - Y1 ("B"-5) Always 10 kΩ or higher
      Y1 ("A"-2) - Body ground Always 10 kΩ or higher
      Y1 ("A"-1) - Y1 ("B"-5) Always Below 1 Ω
      Y1 ("A"-1) - Y1 ("B"-4) Always 10 kΩ or higher
      Y1 ("A"-1) - Body ground Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement Click here.


    NG

    REPLACE SKID CONTROL SENSOR WIRE

    OK

  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)


    1. A0162CXE03

      Reconnect the skid control sensor wire.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    3. Disconnect the skid control ECU connector and the rear speed sensor connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      J77-5 (RR+) - X1-2 (RR+) Always Below 1 Ω
      J77-5 (RR+) - Body ground Always 10 kΩ or higher
      J77-6 (RR-) - X1-1 (RR-) Always Below 1 Ω
      J77-6 (RR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      J77-4 (RL+) - Y1-2 (RL+) Always Below 1 Ω
      J77-4 (RL+) - Body ground Always 10 kΩ or higher
      J77-3 (RL-) - Y1-1 (RL-) Always Below 1 Ω
      J77-3 (RL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK REAR SPEED SENSOR TIP


    1. Remove the rear speed sensor Click here.

    2. Check the speed sensor tip.

      OK
      No scratches, oil, or foreign matter on the sensor tip.

      Note

      Check the speed sensor signal after cleaning or replacement Click here.


    NG

    CLEAN OR REPLACE REAR SPEED SENSOR

    OK

  11. CHECK REAR SPEED SENSOR ROTOR


    1. Remove the rear speed sensor rotor Click here.

    2. Check the speed sensor rotor.

      OK
      No scratches, oil, or foreign matter on the rotors.

      Note

      Check the speed sensor signal after cleaning or replacement Click here.

      Tech Tips

      The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.

      If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.


    NG

    CLEAN OR REPLACE REAR SPEED SENSOR ROTOR

    OK

  12. RECONFIRM DTC


    1. Reconnect the skid control ECU connector and the rear speed sensor connector.

    2. Install the rear speed sensor and the rear speed sensor rotor.

    3. Clear the DTCs Click here.

    4. Start the engine.

    5. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

    6. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output A
      DTCs (C1235/35, C1236/36, C1238/38 and C1239/39) are not output B

    B

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

    A

  13. REPLACE REAR SPEED SENSOR


    1. Turn the engine switch off.

    2. Replace the rear speed sensor Click here.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  14. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

    4. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output A
      DTCs (C1235/35, C1236/36, C1238/38 and C1239/39) are not output B

    B

    END

    A

  15. REPLACE REAR SPEED SENSOR ROTOR


    1. Turn the engine switch off.

    2. Replace the rear axle hub and bearing assembly (rear speed sensor rotor) Click here.

      Tech Tips

      The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.

      If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  16. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

    4. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output A
      DTCs (C1235/35, C1236/36, C1238/38 and C1239/39) are not output B

    B

    END

    A

    REPLACE SKID CONTROL ECU Click here