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

Refer to DTCs C1464/31 and C1465/32 Click here.

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

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

When 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 ↑

  • Front speed sensor LH

  • Speed sensor circuit

  • Sensor installation

  • Speed sensor rotor

  • Skid control ECU
C1238/38 304 ↑

  • Rear speed sensor RH

  • Speed sensor circuit

  • Sensor installation

  • Speed sensor rotor

  • Skid control ECU
C1239/39 305 ↑

  • Rear speed sensor LH

  • Speed sensor circuit

  • Sensor installation

  • Speed sensor rotor

  • Skid control ECU

C1275/75

C1276/76

 - Detected only during test mode.

  • Front speed sensor

  • Front speed sensor circuit

  • Sensor installation

C1277/77

C1278/78

 - Detected only during test mode.

  • Rear speed sensor

  • Rear speed sensor circuit

  • Sensor installation

Tech Tips


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

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

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

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

WIRING DIAGRAM

Refer to DTCs C1464/31 and C1465/32 Click here or DTCs C1466/33 and C1467/34 Click here.

INSPECTION PROCEDURE

Note

When replacing the skid control ECU, perform the following operations:


  • Initialization of linear solenoid valve and calibration Click here

  • Yaw rate and acceleration sensor zero point calibration Click here

PROCEDURE


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


    1. Disconnect the A19 and A21 ECU connectors.

    2. Disconnect the A55 and A91 sensor wire connectors.

    3. Disconnect the R64 and S91 sensor wire connectors.

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

      Standard resistance
      for RH
      Tester Connection Condition Specified Condition
      A19-16 (FR+) - A55-2 (FR+) Always Below 1 Ω
      A19-15 (FR-) - A55-1 (FR-) Always Below 1 Ω
      A21-11 (RR+) - R64-3 (RR+) Always Below 1 Ω
      A21-10 (RR-) - R64-4 (RR-) Always Below 1 Ω
      A19-16 (FR+) - Body ground Always 10 kΩ or higher
      A19-15 (FR-) - Body ground Always 10 kΩ or higher
      A21-11 (RR+) - Body ground Always 10 kΩ or higher
      A21-10 (RR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A21-16 (FL+) - A91-1 (FL+) Always Below 1 Ω
      A21-15 (FL-) - A91-2 (FL-) Always Below 1 Ω
      A19-11 (RL+) - S91-3 (RL+) Always Below 1 Ω
      A19-10 (RL-) - S91-4 (RL-) Always Below 1 Ω
      A21-16 (FL+) - Body ground Always 10 kΩ or higher
      A21-15 (FL-) - Body ground Always 10 kΩ or higher
      A19-11 (RL+) - Body ground Always 10 kΩ or higher
      A19-10 (RL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK SKID CONTROL ECU (SENSOR INPUT VOLTAGE)


    1. A01GZ6BE06

      Reconnect the A19 and A21 ECU connectors.

    2. Disconnect the A55 sensor wire connector.

    3. Disconnect the A91 sensor wire connector.

    4. Disconnect the R64 sensor wire connector.

    5. Disconnect the S91 sensor wire connector.

    6. Turn the power switch ON (IG).

    7. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A55-2 (FR+) - Body ground Power switch ON (IG) 6.7 to 14 V
      A91-1 (FL+) - Body ground Power switch ON (IG) 6.7 to 14 V
      R64-3 (RR+) - Body ground Power switch ON (IG) 6.7 to 14 V
      S91-3 (RL+) - Body ground Power switch ON (IG) 6.7 to 14 V
      Result
      Result Proceed to
      OK A
      NG for LHD B
      for RHD C

    B

    REPLACE SKID CONTROL ECU Click here

    C

    REPLACE SKID CONTROL ECU Click here

    A

  3. RECONFIRM DTC


    1. Clear the DTC 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 60 seconds or more.

    4. Check if the same DTCs are recorded Click here.

      Tech Tips

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

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

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  4. INSPECT SPEED SENSOR TIP


    1. Remove the front speed sensor Click here and rear speed sensor Click here.

    2. Check the sensor tip.

      OK
      No scratches or foreign matter on the sensor tip.

      Note

      Check the speed sensor signal after replacement Click here.

      Result
      Result Proceed to
      OK A
      NG Front speed sensor B
      Rear speed sensor C

    B

    CLEAN OR REPLACE FRONT SPEED SENSOR Click here

    C

    CLEAN OR REPLACE REAR SPEED SENSOR Click here

    A

  5. INSPECT SPEED SENSOR ROTOR


    1. Remove the front axle hub and bearing (speed sensor rotor) Click here.

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

    3. Check each sensor rotor.

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

      Tech Tips

      If the sensor rotor is damaged, replace the front or rear axle hub bearing assembly.

      Note


      • Do not use any kind of cleaner when cleaning the speed sensor rotor.

      • Check the speed sensor signal after cleaning/replacement Click here.

      Result
      Result Proceed to
      OK A
      NG Front speed sensor rotor B
      Rear speed sensor rotor C

    B

    CLEAN OR REPLACE FRONT AXLE HUB AND BEARING ASSEMBLY (SPEED SENSOR ROTOR) Click here

    C

    CLEAN OR REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (SPEED SENSOR ROTOR) Click here

    A

  6. 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 60 seconds or more.

    4. Check if the same DTCs are recorded Click here.

      Tech Tips

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      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 C1239/39) are output for LHD B
      for RHD C

    B

    REPLACE SKID CONTROL ECU Click here

    C

    REPLACE SKID CONTROL ECU Click here

    A

    USE SIMULATION METHOD TO CHECK Click here