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 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.

A011YX4E10
DTC No. 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

  • Skid control ECU (Brake booster with master cylinder assembly)

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

  • Skid control ECU (Brake booster with master cylinder assembly)

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

  • Skid control ECU (Brake booster with master cylinder assembly)

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

  • Skid control ECU (Brake booster with master cylinder assembly)

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

  • Skid control ECU (Brake booster with master cylinder assembly)

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

  • Skid control ECU (Brake booster with master cylinder assembly)

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

  • Skid control ECU (Brake booster with master cylinder assembly)

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

  • Skid control ECU (Brake booster with master cylinder assembly)

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

  • Skid control ECU (Brake booster with master cylinder assembly)

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

  • Skid control ECU (Brake booster with master cylinder assembly)

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

  • Skid control ECU (Brake booster with master cylinder assembly)

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

  • Skid control ECU (Brake booster with master cylinder assembly)

C1271/71

C1272/72

- Detected only during Test Mode.
  • Front speed sensor RH/LH

  • Sensor installation

  • Front speed sensor rotor RH/LH (Front drive outboard joint shaft assembly RH/LH)

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

A011XHVE07

INSPECTION PROCEDURE

Note

When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve Click here.

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

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

      ABS/VSC/TRAC
      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 TECHSTREAM (FRONT SPEED SENSOR)

    1. Select the Data List on the Techstream Click here.

      ABS/VSC/TRAC
      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 the speed value output from the speed sensor displayed on the Techstream.

      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 Techstream is similar to the speed 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 output 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. Turn the power switch off.

      A011Z1AE26
    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. Install the front speed sensor.

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

    3. Disconnect the skid control ECU (brake booster with master cylinder assembly) connector and 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
      A28-18 (FR+) - A53-1 (FR+) Always Below 1 Ω
      A28-18 (FR+) - Body ground Always 10 kΩ or higher
      A28-5 (FR-) - A53-2 (FR-) Always Below 1 Ω
      A28-5 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A28-31 (FL+) - A16-1 (FL+) Always Below 1 Ω
      A28-31 (FL+) - Body ground Always 10 kΩ or higher
      A28-32 (FL-) - A16-2 (FL-) Always Below 1 Ω
      A28-32 (FL-) - Body ground Always 10 kΩ or higher
    NG
    OK
  8. INSPECT SKID CONTROL ECU (SENSOR OUTPUT)

    1. Reconnect the skid control ECU (brake booster with master cylinder assembly) connector.

      A011YLOE01
    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 Condition Specified Condition
      A53-1 (FR+) - Body ground Power switch on (IG) 5.7 to 14 V
      for LH
      Tester Connection Condition Specified Condition
      A16-1 (FL+) - Body ground Power switch on (IG) 5.7 to 14 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Front Speed Sensor)

    NG
    OK
  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 output 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 output 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 DRIVE OUTBOARD JOINT SHAFT ASSEMBLY

    1. Turn the power switch off.

    2. Replace the front speed sensor rotor (front drive outboard joint shaft assembly) Click here.

      Tech Tips

      If the front speed sensor rotor needs to be replaced, replace the front drive outboard joint shaft 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 output 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