ELECTRONICALLY CONTROLLED 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 sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for ABS control.

DTCs C1271/71 and C1272/72 can be cleared when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs C1271/71 and C1272/72 are output only in Test Mode.

A01NHRNE03
DTC Code INF Code DTC Detection Condition Trouble Area
C0200/31 251 At a vehicle speed of 10 km/h (6 mph) or more, an open or short signal occurs in the speed sensor circuit.

  • Front speed sensor RH

  • Speed sensor circuit

  • Sensor installation

  • Speed sensor rotor

  • Skid control ECU
↑ 252 More than one speed sensor circuit signal is abnormal. ↑
↑ 253 Speed sensor circuit signal is open for 0.5 seconds or more. ↑
↑ 254 A momentary interruption of the sensor signal from the speed sensor occurs 255 times or more. ↑
↑ 255 Frequency of 2.4 kHz or more is input.

  • Front speed sensor RH

  • Speed sensor circuit

  • Speed sensor rotor

  • Skid control ECU
↑ 262

Either of the following is detected:


  1. With the voltage of IG1 terminal 9.5 V or more, the sensor power supply voltage decreases for 0.5 seconds or more.

  2. With the voltage of IG1 terminal at 9.5 V or more, the sensor power supply voltage fluctuates for 60 seconds or more.

  • Speed sensor circuit

  • Skid control ECU
C0205/32 264 At a vehicle speed of 10 km/h (6 mph) or more, an open or short signal occurs in the speed sensor circuit.

  • Front speed sensor LH

  • Speed sensor circuit

  • Sensor installation

  • Speed sensor rotor

  • Skid control ECU
↑ 265 More than one speed sensor circuit signal is abnormal. ↑
↑ 266 Speed sensor circuit signal is open for 0.5 seconds or more. ↑
↑ 267 A momentary interruption of the sensor signal from the speed sensor occurs 255 times or more. ↑
↑ 268 Frequency of 2.4 kHz or more is input.

  • Front speed sensor LH

  • Speed sensor circuit

  • Speed sensor rotor

  • Skid control ECU
↑ 275

Either of the following is detected:


  1. With the voltage of IG1 terminal 9.5 V or more, the sensor power supply voltage decreases for 0.5 seconds or more.

  2. With the voltage of IG1 terminal at 9.5 V or more, the sensor power supply voltage fluctuates for 60 seconds or more.

  • Speed sensor circuit

  • 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

A01NG65E01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the intelligent tester, check for any momentary interruptions in the wire harness and connector corresponding to a DTC Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Speed Open FR speed sensor open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      FL Speed Open FL speed sensor open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      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

    OK

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


    1. Select the Data List 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 / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
      FL Wheel Speed FL wheel speed sensor / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations

    2. Check that the speed value output from the speed sensor displayed on the intelligent tester.

      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 Reference Chart Click here.

      OK
      The speed value output from the speed sensor displayed on the intelligent tester is the similar speed as indicated on the speedometer.

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  3. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)


    1. Turn the power switch off.

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

      OK
      All Test Mode DTCs are cleared.

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  4. 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 10 km/h (6 mph) or more for at least 60 seconds.

    5. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTCs (C0200/31 and 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 Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    B

    CHECK FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR SERRATIONS Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  5. CHECK FRONT SPEED SENSOR INSTALLATION


    1. A01NF5QE26

      Turn the power 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
      8.5 N*m (87 kgf*cm, 75 in.*lbf)

    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY Click here

    OK

  6. CHECK FRONT SPEED SENSOR TIP


    1. Remove the front speed sensor Click here.

    2. Check the speed sensor tip.

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

      Note

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


    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR

    OK

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


    1. A01NG6TE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2

      Front view of wire harness connector

      (to Front Speed Sensor)

      Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    2. Disconnect the skid control ECU connectors and the front speed sensor connector.

    3. 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
      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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR SERRATIONS


    1. A01NEZVE07
      Text in Illustration
      *1

      Component with harness connected

      (Skid Control ECU)
      *2 Normal Signal Waveform

      Turn the power switch off.

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

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

    4. Check the 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.

      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.

      Note

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

      Tech Tips

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


    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR OR FRONT SPEED SENSOR ROTOR

    OK

  9. 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 10 km/h (6 mph) or more for at least 60 seconds.

    5. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTCs (C0200/31 and 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 Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    B

    REPLACE SKID CONTROL ECU Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here