VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1271, C1272, C1330, C1331, C1464, C1465

DTC Code DTC Name
C1271 Low Output Signal of Front Speed Sensor RH (Test Mode DTC)
C1272 Low Output Signal of Front Speed Sensor LH (Test Mode DTC)
C1330 Open in Front Speed Sensor RH
C1331 Open in Front Speed Sensor LH
C1464 Front Speed Sensor RH
C1465 Front Speed Sensor LH

DESCRIPTION

Each speed sensor detects wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS.

The speed sensor rotors have rows of alternating N and S magnetic poles. The speed sensors use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect the vehicle speed even when the vehicle is nearly stationary.

DTCs C1271 and C1272 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1271 and C1272 are output only in Test Mode.

Tech Tips

When the connectors between the speed sensor and skid control ECU (brake actuator assembly) are connected, the following waveform is output.

A004MOIE29
Text in Illustration
*1 Front Speed Sensor *2 Speed Sensor Rotor
*a

Waveform (Reference):

Between Speed Sensor (-) and Body Ground

 *b Low speed
*c High speed - -
DTC No. DTC Detection Condition Trouble Area
C1271 Detected only during Test Mode.

  • Front speed sensor RH

  • Sensor installation

  • Front speed sensor rotor RH (front axle hub sub-assembly RH)
C1272 Detected only during Test Mode.

  • Front speed sensor LH

  • Sensor installation

  • Front speed sensor rotor LH (front axle hub sub-assembly LH)
C1330 An open or short in the speed sensor signal circuit.

  • Front speed sensor RH

  • Speed sensor circuit

  • Sensor installation
C1331 An open or short in the speed sensor signal circuit.

  • Front speed sensor LH

  • Speed sensor circuit

  • Sensor installation
C1464

Any of the following is detected:


  1. The vehicle speed is more than 50.4 km/h (31 mph) and pulses are not input for 0.4 seconds.

  2. After the initial start or restart and when the vehicle speed has reached 12 km/h (7 mph), a wheel speed of 0 km/h (0 mph) is detected.

  3. After the initial start or restart and when the vehicle speed has reached 20 km/h (12 mph), a front wheel speed of 0 km/h (0 mph) is detected.

  4. The following conditions are met for 9 to 72 seconds or more (varies depending on the driving conditions):


    • The difference between the speed of the fastest wheel and the speed of the slowest wheel is 5% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

    • The vehicle speed is less than 100 km/h (62 mph) and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 5 km/h (3 mph) or more. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 16 km/h (10 mph) is allowable.)

    • The vehicle speed is 100 km/h (62 mph) or more and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 6% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

  5. Wheel speed sensor signal fluctuation is equivalent to 98 G or more, or alternates between 50 G or more and -50 G or less.

  6. An abnormal signal is received from a wheel speed sensor.

  • Front speed sensor RH

  • Speed sensor circuit

  • Front speed sensor rotor RH (front axle hub sub-assembly RH)

  • Sensor installation

  • Skid control ECU (brake actuator assembly)
C1465

Any of the following is detected:


  1. The vehicle speed is more than 50.4 km/h (31 mph) and pulses are not input for 0.4 seconds.

  2. After the initial start or restart and when the vehicle speed has reached 12 km/h (7 mph), a wheel speed of 0 km/h (0 mph) is detected.

  3. After the initial start or restart and when the vehicle speed has reached 20 km/h (12 mph), a front wheel speed of 0 km/h (0 mph) is detected.

  4. The following conditions are met for 9 to 72 seconds or more (varies depending on the driving conditions):


    • The difference between the speed of the fastest wheel and the speed of the slowest wheel is 5% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

    • The vehicle speed is less than 100 km/h (62 mph) and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 5 km/h (3 mph) or more. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 16 km/h (10 mph) is allowable.)

    • The vehicle speed is 100 km/h (62 mph) or more and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 6% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

  5. Wheel speed sensor signal fluctuation is equivalent to 98 G or more, or alternates between 50 G or more and -50 G or less.

  6. An abnormal signal is received from a wheel speed sensor.

  • Front speed sensor LH

  • Speed sensor circuit

  • Front speed sensor rotor LH (front axle hub sub-assembly LH)

  • Sensor installation

  • Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

A004O9HE01
*a Front Speed Sensor LH
*b Front Speed Sensor RH
*c Skid Control ECU (Brake Actuator Assembly)

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration Click here.

PROCEDURE


  1. READ VALUE USING GTS (FRONT SPEED SENSOR)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Select the Data List on the GTS Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Wheel Speed Front wheel speed sensor RH reading/ 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 wheel speed sensor LH reading/ 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

    4. Check the speed value output from the speed sensor displayed on the GTS.

      Tech Tips

      Factors that affect the indicated vehicle speed include tire size, tire pressure, 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 GTS is similar to the speed indicated on the speedometer.

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  2. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)


    1. Turn the ignition switch off.

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

      OK
      No Test Mode DTCs are output.

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  3. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

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

      Result
      Result Proceed to
      DTCs C1330, C1331, C1464 and C1465 are not output. A
      DTCs C1330, C1331, C1464 and/or C1465 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.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE FRONT SPEED SENSOR Click here

  4. CHECK FRONT SPEED SENSOR INSTALLATION


    1. A004O3KE14
      Text in Illustration
      *a Normal
      *b Abnormal
      *c Clearance

      Turn the ignition switch off.

    2. Check the speed sensor installation Click here.

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

    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY Click here

    OK

  5. CHECK FRONT SPEED SENSOR AND SENSOR ROTOR


    1. Remove the front speed sensor and the component with the sensor rotor (See page for speed sensor, Click here for sensor rotor).

    2. Check the speed sensor tip and speed sensor rotor.

      OK
      No scratches, oil, or foreign matter on the sensor tip and rotor.

      Note


      • If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

        If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.

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


    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR)


    1. Install the front speed sensor and the component with the sensor rotor.

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

    3. Disconnect the A84 skid control ECU (brake actuator assembly) connector and A23 or A24 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
      A84-18 (FR+) - A23-1 (FR+) Always Below 1 Ω
      A84-18 (FR+) or A23-1 (FR+) - Body ground Always 10 kΩ or higher
      A84-29 (FR-) - A23-2 (FR-) Always Below 1 Ω
      A84-29 (FR-) or A23-2 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A84-21 (FL+) - A24-1 (FL+) Always Below 1 Ω
      A84-21 (FL+) or A24-1 (FL+) - Body ground Always 10 kΩ or higher
      A84-33 (FL-) - A24-2 (FL-) Always Below 1 Ω
      A84-33 (FL-) or A24-2 (FL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. RECONFIRM DTC


    1. Reconnect the A84 skid control ECU (brake actuator assembly) connector and A23 or A24 front speed sensor connector.

    2. Clear the DTCs Click here

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

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

      Result
      Result Proceed to
      DTCs C1330, C1331, C1464 and/or C1465 are output. A
      DTCs C1330, C1331, C1464 and C1465 are not output. B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  8. REPLACE FRONT SPEED SENSOR


    1. Turn the ignition switch off.

    2. Replace the front speed sensor Click here.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  9. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

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

      Result
      Result Proceed to
      DTCs C1330, C1331, C1464 and/or C1465 are output. A
      DTCs C1330, C1331, C1464 and C1465 are not output. B

    B

    END

    A

  10. REPLACE FRONT AXLE HUB SUB-ASSEMBLY


    1. Turn the ignition switch off.

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

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  11. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

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

      Result
      Result Proceed to
      DTCs C1330, C1331, C1464 and C1465 are not output. A
      DTCs C1330, C1331, C1464 and/or C1465 are output. B

    A

    END

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here