ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1271/71, C1272/72, C1464/31, C1465/32

DTC Code DTC Name
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)
C1464/31 Front Speed Sensor RH Circuit
C1465/32 Front Speed Sensor LH Circuit

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.

A003ZJLE05
DTC Code INF Code DTC Detection Condition Trouble Area
C1464/31 501 While driving at 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more.
  • Open or short in speed sensor

  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Front speed sensor RH

  • Brake booster with master cylinder (Skid control ECU)

502 A malfunction occurs in 2 or more wheels.
503 An open is detected in the speed sensor signal circuit for 0.05 seconds or more.
  • Open or short in speed sensor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Front speed sensor RH

  • Brake booster with master cylinder (Skid control ECU)

504 Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.
  • Open or short in speed sensor

  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Front speed sensor RH

  • Brake booster with master cylinder (Skid control ECU)

506 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more.
  • Open or short in wire harness

  • Brake booster with master cylinder (Skid control ECU)

507 While driving at 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more.
  • Open or short in speed sensor

  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Front speed sensor RH

  • Brake booster with master cylinder (Skid control ECU)

508 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more.
  • Open or short in wire harness

  • Brake booster with master cylinder (Skid control ECU)

C1465/32 511 While driving at 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more.
  • Open or short in speed sensor

  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Front speed sensor LH

  • Brake booster with master cylinder (Skid control ECU)

512 A malfunction occurs in 2 or more wheels.
513 An open is detected in the speed sensor signal circuit for 0.05 seconds or more.
  • Open or short in speed sensor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Front speed sensor LH

  • Brake booster with master cylinder (Skid control ECU)

514 Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.
  • Open or short in speed sensor

  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Front speed sensor LH

  • Brake booster with master cylinder (Skid control ECU)

516 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more.
  • Open or short in wire harness

  • Brake booster with master cylinder (Skid control ECU)

517 While driving at 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more.
  • Open or short in speed sensor

  • Improperly installed speed sensor, or abnormal clearance between sensor and rotor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Front speed sensor LH

  • Brake booster with master cylinder (Skid control ECU)

518 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more.
  • Open or short in wire harness

  • Brake booster with master cylinder (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 C1464/31 and C1271/71 are for the front speed sensor RH.

  • DTCs C1465/32 and C1272/72 are for the front speed sensor LH.

WIRING DIAGRAM

A003X1BE04

INSPECTION PROCEDURE

Note

When replacing the brake booster with master cylinder (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 Front speed sensor RH open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      -
      FL Speed Open Front speed sensor LH 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
    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 Front speed sensor RH / Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
      FL Wheel Speed Front speed sensor LH / Min.: 0 km/h (0 mph), Max.: 326 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 the 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
    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
    OK
  4. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs Click here.

    3. Turn the power switch on (READY).

    4. Perform a road test.

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

      Result
      Result Proceed to
      DTCs (C1464/31 and C1465/32) are not output A
      DTCs (C1464/31 and/or C1465/32) 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
    A
  5. CHECK FRONT SPEED SENSOR INSTALLATION


    1. A003YLXE26

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


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

    2. Disconnect the skid control ECU connector 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
      A61-18 (FR+) - A34-2 (FR+) Always Below 1 Ω
      A61-18 (FR+) - Body ground Always 10 kΩ or higher
      A61-5 (FR-) - A34-1 (FR-) Always Below 1 Ω
      A61-5 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A61-31 (FL+) - A13-2 (FL+) Always Below 1 Ω
      A61-31 (FL+) - Body ground Always 10 kΩ or higher
      A61-32 (FL-) - A13-1 (FL-) Always Below 1 Ω
      A61-32 (FL-) - Body ground Always 10 kΩ or higher

    NG
    OK
  8. INSPECT SKID CONTROL ECU (SENSOR OUTPUT)


    1. A003ZTVE51
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Front Speed Sensor)

      Reconnect the skid control ECU connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      for RH
      Tester Connection Switch Condition Specified Condition
      A34-2 (FR+) - Body ground Power switch on (IG) 5.7 to 14 V
      for LH
      Tester Connection Switch Condition Specified Condition
      A13-2 (FL+) - Body ground Power switch on (IG) 5.7 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B
    C
    A
  9. RECONFIRM DTC


    1. Turn the power switch off.

    2. Reconnect the front speed sensor connector.

    3. Clear the DTCs Click here.

    4. Turn the power switch on (READY).

    5. Perform a road test.

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

      Result
      Result Proceed to
      DTCs (C1464/31 and/or C1465/32) are output A
      DTCs (C1464/31 and C1465/32) are not 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
    A
  10. REPLACE FRONT SPEED SENSOR


    1. Turn the power switch off.

    2. Replace the front speed sensor Click here.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT
  11. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the power switch on (READY).

    3. Perform a road test.

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

      Result
      Result Proceed to
      DTCs (C1464/31 and/or C1465/32) are output A
      DTCs (C1464/31 and C1465/32) are not 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
    A
  12. REPLACE FRONT SPEED SENSOR ROTOR


    1. Turn the power switch off.

    2. Replace the front axle hub sub-assembly (front speed sensor rotor) Click here.

      Tech Tips

      The front speed sensor rotor is incorporated into the front axle hub sub-assembly.

      If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT
  13. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the power switch on (READY).

    3. Perform a road test.

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

      Result
      Result Proceed to
      DTCs (C1464/31 and/or C1465/32) are output (for LHD) A
      DTCs (C1464/31 and/or C1465/32) are output (for RHD) B
      DTCs (C1464/31 and C1465/32) are not output C

      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
    C
    A