ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C0200/31, C0205/32, C1271/71, C1272/72

DTC Code DTC Name
C0200/31 Front Speed Sensor RH Circuit
C0205/32 Front Speed Sensor LH Circuit
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)

DESCRIPTION

The speed sensors detect wheel speed and transmit the signals to the ECU. These signals are used for control of the ABS control system. Each of the front and rear rotors has 48 serrations. When the rotors rotate, the magnetic filed 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 and C1272/72 can be deleted when the speed sensor sends a wheel speed signal or the Test Mode ends. DTCs C1271/71 and C1272/72 are output only in the Test Mode.

A01CIC4E20
DTC Code DTC Detection Condition Trouble Area

C0200/31

C0205/32

When any of the following is detected:


  1. At a vehicle speed of 10 km/h (6 mph) or more, an open or short in the sensor signal circuit continues for 15 seconds or more.

  2. Momentary interruption of the sensor signal from the abnormal wheel occurs 7 times or more.

  3. An open in the speed sensor signal circuit continues for 0.5 seconds or more.

  4. When the following condition occurs 4 or more times after the ignition switch is turned off:

    The speeds of the front wheels are lower than the rear wheel speed by 20 km/h (12 mph) or more for 20 seconds or more.

  • Front speed sensor RH/LH

  • Speed sensor circuit

  • Speed sensor rotor

  • Sensor installation

  • Skid control ECU

C1271/71

C1272/72

 Detected only during Test Mode.

  • Front speed sensor RH/LH

  • Sensor installation

  • Speed sensor rotor

Tech Tips


  • DTCs C0200/31 and C1271/71 are for the front speed sensor RH.

  • DTCs C0205/32 and C1272/72 are for the front speed sensor LH.

WIRING DIAGRAM

A01CISGE01

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE ON INTELLIGENT TESTER (FRONT SPEED SENSOR)


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Select the Data List mode on the intelligent tester Click here.

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

    5. Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester and the actual speed value when driving the vehicle.

      Tech Tips

      Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart Click here.

      OK
      The speed value output from the speed sensor displayed on the intelligent tester is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  2. PERFORM TEST MODE (SIGNAL CHECK)


    1. Perform sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are not output.

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  3. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTC (See Pub. No. RM1008E, page 05-195).

    3. Start the engine.

    4. Drive the vehicle at the speed of 20 km/h (12 mph) or more for at least 30 seconds.

    5. Check if the same DTC is recorded (See Pub. No. RM1008E, page 05-195).

      Result
      Result Proceed to
      DTCs (C0200/31 and/or C0205/32) are not output A
      DTCs (C0200/31 and/or C0205/32) are output B

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    B

    INSPECT FRONT SPEED SENSOR Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

  4. CHECK FRONT SPEED SENSOR INSTALLATION


    1. A01CJG2E02

      Turn the ignition switch off.

    2. Check the speed sensor installation.

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

    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY

    OK

  5. CHECK FRONT SPEED SENSOR TIP


    1. Remove the front speed sensor (See Pub. No. RM1008E, page 32-89).

    2. Check the speed 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. A01CHKYE01

      Turn the ignition switch off.

    2. Install the front speed sensor.

    3. Disconnect 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
      1 (FR+) - 2 (FR-) Always 0.9 to 1.3 kΩ at 20°C (68°F)
      1 (FR+) - Body ground Always 10 kΩ or higher
      2 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      1 (FL+) - 2 (FL-) Always 0.9 to 1.3 kΩ at 20°C (68°F)
      1 (FL+) - Body ground Always 10 kΩ or higher
      2 (FL-) - Body ground Always 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 (SKID CONTROL ECU - FRONT SPEED SENSOR)


    1. A01CJF4E01

      Disconnect the skid control ECU connector.

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

      Standard resistance
      for RH
      Tester Connection Condition Specified Condition
      S14-26 (FR+) - A3-1 (FR+) Always Below 1 Ω
      S14-26 (FR+) - Body ground Always 10 kΩ or higher
      S14-25 (FR-) - A3-2 (FR-) Always Below 1 Ω
      S14-25 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      S14-27 (FL+) - A2-1 (FL+) Always Below 1 Ω
      S14-27 (FL+) - Body ground Always 10 kΩ or higher
      S14-28 (FL-) - A2-2 (FL-) Always Below 1 Ω
      S14-28 (FL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK SPEED SENSOR AND SPEED SENSOR ROTOR SERRATIONS


    1. A01CHAXE01

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

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

    3. Check that a waveform is output by each sensor circuit when the tires are rotated.

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

      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's scratches, looseness or foreign matter attached to it.

      Note

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


    NG

    CLEAN OR REPLACE SPEED SENSOR OR SPEED SENSOR ROTOR

    OK

  9. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTC (See Pub. No. RM1008E, page 05-195).

    3. Start the engine.

    4. Drive the vehicle at the speed of 20 km/h (12 mph) or more for at least 30 seconds.

    5. Check if the same DTC is recorded (See Pub. No. RM1008E, page 05-195).

      Result
      Result Proceed to
      DTCs (C0200/31 and/or C0205/32) are not output A
      DTCs (C0200/31 and/or C0205/32) are output B

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    B

    REPLACE SKID CONTROL ECU

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here