ELECTRONICALLY CONTROLLED BRAKE 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

When foreign matter adheres to the speed sensor tip or speed sensor 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 cleared 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.

DTC Code INF Code DTC Detection Condition Trouble Area
C1235/35 302

Either of the following is detected:


  1. Continuous noise occurs in speed sensor signals when vehicle speed is 20 km/h (12 mph) or more for 5 seconds or more.

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

  • Front speed sensor RH

  • Speed sensor circuit

  • Sensor installation

  • Speed sensor rotor

  • Skid control ECU
C1236/36 303

Either of the following is detected:


  1. Continuous noise occurs in speed sensor signals when vehicle speed is 20 km/h (12 mph) or more for 5 seconds or more.

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

  • Front speed sensor LH

  • Speed sensor circuit

  • Sensor installation

  • Speed sensor rotor

  • Skid control ECU
C1238/38 304

Either of the following is detected:


  1. Continuous noise occurs in speed sensor signals when vehicle speed is 20 km/h (12 mph) or more for 5 seconds or more.

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

  • Rear speed sensor RH

  • Speed sensor circuit

  • Sensor installation

  • Speed sensor rotor

  • Skid control ECU
C1239/39 305

Either of the following is detected:


  1. Continuous noise occurs in speed sensor signals when vehicle speed is 20 km/h (12 mph) or more for 5 seconds or more.

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

  • Rear speed sensor LH

  • Speed sensor circuit

  • Sensor installation

  • Speed sensor rotor

  • Skid control ECU

C1275/75

C1276/76

C1277/77

C1278/78

 - Detected only during Test Mode.

  • Speed sensor

  • 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

Refer to DTCs C0200/31, C0205/32, C0210/33 and C0215/34 Click here for front, and Click here for rear).

INSPECTION PROCEDURE

Note

When replacing the skid control ECU, perform initialization and calibration of the linear solenoid valve Click here.

Tech Tips

When C0200/31, C0205/32, C0210/33, and/or C0215/34 are 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. A01NEZVE11
      Text in Illustration
      *1

      Component without harness connected

      (Skid Control ECU)
      *2 Normal Signal Waveform

      Connect an oscilloscope to each speed sensor terminal of the skid control ECU and body ground.

    2. Check that waveform output when the wheels are rotated.

      OK
      The same waveform is output from all the sensors 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.

      • 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.


    NG

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SPEED SENSOR) Click here

    OK

  2. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs Click here.

    3. Turn the power switch on (READY).

    4. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 15 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 Click here

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


    1. Turn the power switch off.

      A01NGORE02

    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 connectors and the speed sensor connectors.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A89-22 (FR+) - A37-2 (FR+) Always Below 1 Ω
      A89-22 (FR+) - Body ground Always 10 kΩ or higher
      A89-23 (FR-) - A37-1 (FR-) Always Below 1 Ω
      A89-23 (FR-) - Body ground Always 10 kΩ or higher
      A92-22 (RR+) - R3-2 (RR+) Always Below 1 Ω
      A92-22 (RR+) - Body ground Always 10 kΩ or higher
      A92-21 (RR-) - R3-1 (RR-) Always Below 1 Ω
      A92-21 (RR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A91-31 (FL+) - A36-2 (FL+) Always Below 1 Ω
      A91-31 (FL+) - Body ground Always 10 kΩ or higher
      A91-32 (FL-) - A36-1 (FL-) Always Below 1 Ω
      A91-32 (FL-) - Body ground Always 10 kΩ or higher
      A90-34 (RL+) - R1-3 (RL+) Always Below 1 Ω
      A90-34 (RL+) - Body ground Always 10 kΩ or higher
      A90-35 (RL-) - R1-1 (RL-) Always Below 1 Ω
      A90-35 (RL-) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2

      Front view of wire harness connector

      (to Speed Sensor)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK SPEED SENSOR AND SPEED SENSOR ROTOR


    1. Remove the speed sensor and speed sensor rotor Click here and Click here for front, or Click here and Click here for rear).

    2. Check the speed sensor tip and speed sensor rotor.

      OK
      The sensor tip and rotor is free of scratches, oil, and foreign matter.

      Note

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


    NG

    CLEAN OR REPLACE SPEED SENSOR AND SPEED SENSOR ROTOR

    OK

  5. RECONFIRM DTC


    1. Install the speed sensor and the speed sensor rotor.

    2. Reconnect the skid control ECU connectors and the speed sensor connectors.

    3. Clear the DTCs Click here.

    4. Turn the power switch on (READY).

    5. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 15 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 Click here

    A

  6. REPLACE SPEED SENSOR


    1. Turn the power switch off.

    2. Replace the front speed sensor and the rear speed sensor Click here for front, or Click here for rear).

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  7. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the power switch on (READY).

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 15 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

  8. REPLACE SPEED SENSOR ROTOR


    1. Turn the power switch off.

    2. Remove the front drive shaft assembly (for front) Click here.

    3. Replace the front drive outboard joint shaft assembly (front speed sensor rotor) or the rear axle hub and bearing assembly (rear speed sensor rotor) Click here for front, or Click here for rear).

      Tech Tips


      • If the front speed sensor rotor needs to be replaced, replace it together with the front drive outboard joint shaft assembly.

      • 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

  9. RECONFIRM DTC


    1. Install the drive shaft assembly (for front).

    2. Clear the DTCs Click here.

    3. Turn the power switch on (READY).

    4. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 15 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

    END

    A

    REPLACE SKID CONTROL ECU Click here