ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C0200/31, C0205/32, C1235/35, C1236/36, C1271/71, C1272/72, C1275/75, C1276/76

DTC Code DTC Name
C0200/31 Front Speed Sensor RH Circuit
C0205/32 Front Speed Sensor LH Circuit
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
C1271/71 Low Output Signal of Front Speed Sensor RH (Test Mode DTC)
C1272/72 Low Output Signal of Front Speed Sensor LH (Test Mode DTC)
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)

DESCRIPTION

The speed sensor detects wheel speed and transmits the appropriate signals to the ECU. These signals are used for control of the ABS control system. The front and rear rotors have 48 serrations each.

When the rotors rotate, the magnetic field generated by the permanent magnet in the speed sensor induces an AC voltage.

Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.

DTCs C1271/71 to C1276/76 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1271/71 to C1276/ 76 are output only in the Test Mode.

A01BI57E04
DTC No. DTC Detection Condition Trouble Area

C0200/31

C0205/32

With vehicle speed at 6 mph (10 km/h) or more, sensor signal circuit of faulty wheel is open or short for 1 second or more.


  • Momentary interruption of sensor signal of faulty wheel has occurred 7 times or more.


  • Sensor signal circuit is open for 0.5 seconds or more.

  • Front speed sensor RH/LH

  • Front speed sensor RH/LH circuit

  • Skid control rotor

  • Sensor installation

  • Brake actuator assembly

C1235/35

C1236/36

 At vehicle speed of 12 mph (20 km/h) or more, condition that noise is included in speed sensor signal continues for 5 seconds or more.

  • Front speed sensor RH/LH

  • Skid control rotor

  • Sensor installation

  • Brake actuator assembly

Tech Tips


  • DTC No. C0200/31 and C1235/35 are for the front speed sensor RH.

  • DTC No. C0205/32 and C1236/36 are for the front speed sensor LH.

WIRING DIAGRAM

A01BAJ3E01

INSPECTION PROCEDURE

Tech Tips

Start the inspection from step 1 when using the intelligent tester and start from step 3 when not using the intelligent tester.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (MOMENTARY INTERRUPTION OF FRONT SPEED SENSOR)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position and turn the intelligent tester main switch on.

    3. Select the DATA LIST mode on the intelligent tester.

      ABS:
      Item (Display) Measurement Item / Range (Display) Normal Condition Diagnostic Note
      FR Speed Open Speed sensor open detection (FR) / OPN DET or NORMAL

      OPN DET: Momentary interruption

      NORMAL: Normal

      		 -
      FL Speed Open Speed sensor open detection (FL) / OPN DET or NORMAL

      OPN DET: Momentary interruption

      NORMAL: Normal

      		 -

    4. Check for any momentary interruption in the wire harness and connector corresponding to a DTC Click here.

      OK
      There are no momentary interruptions.

      Tech Tips

      Perform the above inspection before removing the sensor and connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPEED SENSOR CIRCUIT)

    OK

  2. READ VALUE USING INTELLIGENT TESTER (FRONT SPEED SENSOR)


    1. Select the DATA LIST mode on the intelligent tester.

      ABS:
      Item (Display) Measurement Item / Range (Display) Normal Condition Diagnostic Note
      FR Wheel Speed Wheel speed sensor (FR) reading / min.: 0 mph (0 km/h), max.: 202 mph (326 km/h) Actual wheel speed Similar speed as indicated on speedometer
      FL Wheel Speed Wheel speed sensor (FL) reading / min.: 0 mph (0 km/h), max.: 202 mph (326 km/h) Actual wheel speed Similar speed as indicated on speedometer

    2. Check that there is the speed value output from the speed sensor displayed on the intelligent tester and the speed value displayed on the speedometer are almost the same when driving the vehicle.

      OK
      The speed value output from the speed sensor displayed on the intelligent tester is the same as the actual vehicle speed.

    NG

    INSPECT FRONT SPEED SENSOR INSTALLATION Click here

    OK

  3. PERFORM TEST MODE (SIGNAL CHECK)


    1. Clear the DTC Click here.

    2. Perform sensor signal check in TEST MODE PROCEDURE Click here.

      OK
      All Test Mode DTCs are erased.
      Result
      Result Proceed to
      NG A
      OK B

    B

    RECONFIRM DTC Click here

    A

  4. INSPECT FRONT SPEED SENSOR INSTALLATION


    1. A01BD14E21

      Turn the ignition switch off.

    2. Check the speed sensor installation.

      OK
      The installation bolt is tightened properly.
      There is no clearance between the sensor and the front steering knuckle.
      Torque
      8.0 N*m (82 kgf*cm, 71 in.*lbf)

      Note

      Check the speed sensor signal after replacement Click here.


    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY OR REPLACE FRONT SPEED SENSOR

    OK

  5. INSPECT SPEED SENSOR TIP


    1. Remove the front 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 cleaning or replacement Click here.


    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR

    OK

  6. INSPECT FRONT SPEED SENSOR


    1. A01BFLYE01

      Install the front speed sensor.

    2. Disconnect the front speed sensor connector.

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

      Standard resistance
      RH Side:
      Tester Connection Specified Condition
      2 (FR+) - 1 (FR-) 1.6+-0.2 kΩ at 20°C
      2 (FR+) - Body ground 10 kΩ or higher
      1 (FR-) - Body ground 10 kΩ or higher
      LH Side:
      Tester Connection Specified Condition
      2 (FL+) - 1 (FL-) 1.6+-0.2 kΩ at 20°C
      2 (FL+) - Body ground 10 kΩ or higher
      1 (FL-) - Body ground 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement Click here.


    NG

    REPLACE FRONT SPEED SENSOR

    OK

  7. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND FRONT SPEED SENSOR)


    1. A01BF8HE01

      Disconnect the skid control sensor wire.

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

      Standard resistance
      RH:
      Tester Connection Specified Condition
      B19-31 (FR+) - B18-2 (FR+) Below 1 Ω
      B19-31 (FR+) - Body ground 10 kΩ or higher
      B19-30 (FR-) - B18-1 (FR-) Below 1 Ω
      B19-30 (FR-) - Body ground 10 kΩ or higher
      LH:
      Tester Connection Specified Condition
      B19-9 (FL+) - B20-2 (FL+) Below 1 Ω
      B19-9 (FL+) - Body ground 10 kΩ or higher
      B19-8 (FL-) - B20-1 (FL-) Below 1 Ω
      B19-8 (FL-) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS


    1. A01BAEME03

      Connect the oscilloscope to terminals FR+ - FR- or FL+ - FL- of the skid control ECU.

    2. Drive the vehicle at about 19 mph (30 km/h), and check the signal waveform.

      OK
      A waveform as shown in the figure should be output.

      Tech Tips


      • As vehicle speed (wheel rotation speed) increases, the width of the waveform narrows and the fluctuation in the output voltage becomes greater.

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


    NG

    INSPECT FRONT SKID CONTROL ROTOR Click here

    OK

  9. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Drive the vehicle at a speed of approximately 20 mph (32 km/h) or more for 60 seconds or more.

    3. Check that 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
      Condition Proceed to
      DTCs (C0200/31, C0205/32, C1235/35 and C1236/36) are output A
      DTCs (C0200/31, C0205/32, C1235/35 and C1236/36) are not output (When troubleshooting in accordance with the DTC CHART) B
      DTCs (C0200/31, C0205/32, C1235/35 and C1236/36) are not output (When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE) C

    B

    END

    C

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

    A

  10. INSPECT FRONT SKID CONTROL ROTOR


    1. Turn the ignition switch off.

    2. Remove the front axle hub Click here.

    3. Check the rotor.

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

      Note

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


    NG

    CLEAN OR REPLACE FRONT SKID CONTROL ROTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY