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 Right Front Wheel Speed Sensor Signal Malfunction
C0205/32 Left Front Wheel Speed Sensor Signal Malfunction
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

A01J6BLE02

The speed sensor detects wheel speed and transmits the appropriate signals to the ECU. These signals are used for control of the ABS.

Each of the front and rear rotors have 48 serrations. When the rotors rotate, the magnetic field generated by the permanent magnet in the speed sensor produces 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, C1272/72, C1275/75 and C1276/76 can be deleted when the speed sensor sends a vehicle speed signal or the test mode ends. DTCs C1271/71, C1272/72, C1275/75/75 and C1276/76 are output only in the test mode.

DTC No. DTC Detection Condition Trouble Area

C0200/31

C0205/32

When one of following occurs


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

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

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

  • Front speed sensor

  • Front speed sensor circuit

  • Front speed sensor rotor

  • Sensor installation

C1235/35

C1236/36

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

  • Front speed sensor

  • Front speed sensor circuit

  • Sensor installation
C1271/71 Detected only during test mode

  • Front speed sensor RH

  • Sensor installation

  • Front speed sensor rotor RH
C1272/72 Detected only during test mode

  • Front speed sensor LH

  • Sensor installation

  • Front speed sensor rotor LH
C1275/75 Detected only during test mode Front speed sensor rotor RH
C1276/76 Detected only during test mode Front speed sensor rotor LH

Tech Tips


  • DTCs C0200/31 and C1235/35 are for the front speed sensor RH.

  • DTCs C0205/32 and C1236/36 are for the front speed sensor LH.

WIRING DIAGRAM

A01J612E07

INSPECTION PROCEDURE

PROCEDURE


  1. CHOOSE DIAGNOSIS METHOD


    1. Choose the diagnosis method.

      Method
      Method Proceed to
      Using intelligent tester A
      Not using intelligent tester B

    B

    INSPECT FRONT SPEED SENSOR Click here

    A

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


    1. Check the Data List for proper functioning of the front speed sensor.

      Skid control ECU
      Item Measurement Item / Range (Display) Normal Condition Diagnostic Note
      FR Wheel Speed

      Wheel speed sensor (FR)

      reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)

      		 Actual wheel speed Speed similar to that of speedometer
      FL Wheel Speed

      Wheel speed sensor (FL)

      reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)

      		 Actual wheel speed Speed similar to that of speedometer
      OK
      There is almost no difference between actual wheel speed and displayed speed value.

      Tech Tips

      There is a tolerance of +/-10% in the speedometer indication.


    NG

    INSPECT FRONT SPEED SENSOR Click here

    OK

  3. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS

    A01J4KLE01

    1. Connect an oscilloscope to terminals 31 (FR+) and 30 (FR-), and 9 (FL+) and 8 (FL-) of the S2 skid control ECU connector.

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

      OK
      A waveform is output, as shown in the illustration.

      Tech Tips


      • As vehicle speed (wheel revolution speed) increases, the wavelength shortens and the fluctuation in the output voltage becomes greater.

      • Scratches, looseness or foreign matter on the speed sensor rotor cause noise (errors) in the signal waveform.


    NG

    INSPECT FRONT SPEED SENSOR (INSTALLATION) Click here

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY

  4. INSPECT FRONT SPEED SENSOR

    A01J59WE09

    1. Disconnect the S4 and S5 sensor connectors.

    2. Measure the resistance of the speed sensors.

      Standard resistance
      LH
      Tester Connection Specified Condition
      1 (FL+) - 2 (FL-) 0.65 to 1.8 kΩ
      1 (FL+) - Body ground 10 kΩ or higher
      2 (FL-) - Body ground 10 kΩ or higher
      RH
      Tester Connection Specified Condition
      1 (FR+) - 2 (FR-) 0.65 to 1.8 kΩ
      1 (FR+) - Body ground 10 kΩ or higher
      2 (FR-) - Body ground 10 kΩ or higher

      Tech Tips

      Check the speed sensor signal after the speed sensor replacement.


    NG

    REPLACE FRONT SPEED SENSOR

    OK

  5. CHECK WIRE HARNESS (SKID CONTROL ECU - FRONT SPEED SENSOR)

    A01J6UXE13

    1. Disconnect the S2 ECU connector.

    2. Disconnect the S4 and S5 speed sensor connectors.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      LH
      Tester Connection Specified Condition
      S2-9 (FL+) - S4-1 (FL+) Below 1 Ω
      S2-8 (FL-) - S4-2 (FL-) Below 1 Ω
      S4-1 (FL+) - Body ground 10 kΩ or higher
      S4-2 (FL-) - Body ground 10 kΩ or higher
      RH
      Tester Connection Specified Condition
      S2-31 (FR+) - S5-1 (FR+) Below 1 Ω
      S2-30 (FR-) - S5-2 (FR-) Below 1 Ω
      S5-1 (FR+) - Body ground 10 kΩ or higher
      S5-2 (FR-) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  6. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS

    A01J4KLE01

    1. Connect an oscilloscope to terminals 31 (FR+) and 30 (FR-), and 9 (FL+) and 8 (FL-) of the S2 skid control ECU connector.

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

      OK
      A waveform is output, as shown in the illustration.

      Tech Tips


      • As vehicle speed (wheel revolution speed) increases, the wavelength shortens and the fluctuation in the output voltage becomes greater.

      • Scratches, looseness or foreign matter on the speed sensor rotor cause noise (errors) in the signal waveform.


    NG

    INSPECT FRONT SPEED SENSOR (INSTALLATION) Click here

    OK

  7. CHECK IF DTC OUTPUT RECURS


    1. Clear the DTCs.

    2. Drive the vehicle at approximately 30 km/h (19 mph) or more for 60 seconds or more.

    3. Check for DTCs.

      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    B

    END

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY

  8. INSPECT FRONT SPEED SENSOR (INSTALLATION)

    A01J6RFE08

    1. Check the speed sensor installation Click here.

      OK
      The installation bolt is tightened properly.
      There is no clearance between the sensor and front steering knuckle.

      Tech Tips

      Check the speed sensor signal after the speed sensor replacement.


    NG

    SECURELY REINSTALL FRONT SPEED SENSOR

    OK

  9. INSPECT SPEED SENSOR (TIP)


    1. Remove the front speed sensor.

    2. Check the sensor tip.

      OK
      No scratches or foreign matter on sensor tip.

      Tech Tips


      • If the sensor is contaminated with oil or other foreign material, clean the sensor.

      • If there is iron powder sticking to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign material before replacing the sensor.

      • Check the speed sensor signal after cleaning or replacing the speed sensor.

      Note

      Do not replace the speed sensor if no damage to the speed sensor tip is found.


    NG

    CLEAN OR REPLACE SPEED SENSOR

    OK

  10. INSPECT SPEED SENSOR ROTOR


    1. Remove the front axle hub.

    2. Check the sensor rotor serrations.

      OK
      No scratches, missing teeth or foreign matter on sensor rotor.

      Tech Tips


      • If foreign matter is attached, remove it and check the output waveform after reassembly.

      • Check the speed sensor signal after cleaning or replacing the speed sensor rotor.


    NG

    CLEAN OR REPLACE SPEED SENSOR ROTOR

    OK

  11. CHECK IF DTC OUTPUT RECURS


    1. Clear the DTCs.

    2. Drive the vehicle at approximately 30 km/h (19 mph) or more for 60 seconds or more.

    3. Check for DTCs.

      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    B

    END

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY