ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1273, C1274, C1332, C1333, C1466, C1467

DTC Code DTC Name
C1273 Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1274 Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)
C1332 Open in Rear Speed Sensor RH
C1333 Open in Rear Speed Sensor LH
C1466 Rear Speed Sensor RH
C1467 Rear Speed Sensor LH

DESCRIPTION

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

Speed sensor rotors have rows of alternating N and S magnetic poles, with 32 pairs per wheel, and their magnetic fields change when the rotors turn.

Hall IC type 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 C1273 and C1274 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1273 and C1274 are output only in Test Mode.

A0138FEE11
DTC No. DTC Detection Condition Trouble Area

C1466

C1467

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), the 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 rear 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.*1

    • 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.*2

    • 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.*1

  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.

  • Rear speed sensor RH/LH

  • Speed sensor circuit

  • Rear speed sensor rotor RH/LH (Rear axle hub and bearing assembly RH/LH)

  • Rear speed sensor RH/LH installation

  • Skid control ECU (Brake actuator assembly)

C1332

C1333

 An open or short in the speed sensor signal circuit.

  • Rear speed sensor RH/LH

  • Speed sensor circuit

  • Rear speed sensor RH/LH installation

C1273

C1274

 Detected only during Test Mode.

  • Rear speed sensor RH/LH

  • Rear speed sensor RH/LH installation

  • Rear speed sensor rotor RH/LH (Rear axle hub and bearing assembly RH/LH)

*1: If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.

*2: 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.

Tech Tips


  • DTCs C1273, C1332 and C1466 are for the rear speed sensor RH.

  • DTCs C1274, C1333 and C1467 are for the rear speed sensor LH.

WIRING DIAGRAM

A0137XPE05

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (REAR SPEED SENSOR)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

    5. According to the display on the intelligent tester, read the Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Wheel Speed Rear 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
      RL Wheel Speed Rear 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

    6. Check 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 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 intelligent tester is similar to the speed indicated on the speedometer.

    NG

    CHECK REAR 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
      All Test Mode DTCs are not output.

    NG

    CHECK REAR 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 45 km/h (28 mph) or more for at least 120 seconds.

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

      Result
      Result Proceed to
      DTCs C1332, C1333, C1466 and C1467 are not output. A
      DTCs C1332, C1333, C1466 and/or C1467 are output. B

    B

    Click here

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  4. CHECK REAR SPEED SENSOR INSTALLATION


    1. A0136E1E04
      Text in Illustration
      *1 Rear Speed Sensor
      *a No clearance
      *b OK
      *c NG

      Turn the ignition switch off.

    2. Check the rear speed sensor installation.

      OK
      There is no clearance between the sensor and rear axle carrier.

    NG

    INSTALL REAR SPEED SENSOR CORRECTLY Click here

    OK

  5. CHECK REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR


    1. Remove the rear speed sensor and the rear speed sensor rotor (rear axle hub and bearing assembly) Click here for rear speed sensor, and Click here for rear speed sensor rotor (rear axle hub and bearing assembly).

    2. Check the rear 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 REAR SPEED SENSOR OR REAR SPEED SENSOR ROTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)


    1. Install the rear speed sensor and the rear speed sensor rotor (rear axle hub and bearing assembly).

    2. Disconnect the A46 skid control ECU (brake actuator assembly) connector and the H3 and/or H4 rear speed sensor connector.

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

      Standard Resistance
      RH
      Tester Connection Condition Specified Condition
      A46-17 (RR+) - H3-1 (RR+) Always Below 1 Ω
      A46-17 (RR+) - Body ground Always 10 kΩ or higher
      A46-29 (RR-) - H3-2 (RR-) Always Below 1 Ω
      A46-29 (RR-) - Body ground Always 10 kΩ or higher
      LH
      Tester Connection Condition Specified Condition
      A46-31 (RL+) - H4-1 (RL+) Always Below 1 Ω
      A46-31 (RL+) - Body ground Always 10 kΩ or higher
      A46-18 (RL-) - H4-2 (RL-) Always Below 1 Ω
      A46-18 (RL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. RECONFIRM DTC


    1. Reconnect the skid control ECU (brake actuator assembly) 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 45 km/h (28 mph) or more for at least 120 seconds.

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

      Result
      Result Proceed to
      DTCs C1332, C1333, C1466 and/or C1467 are output. A
      DTCs C1332, C1333, C1466 and C1467 are not output. B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

  8. REPLACE REAR SPEED SENSOR


    1. Turn the ignition switch off.

    2. Replace the rear speed sensor Click here.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  9. CONFIRM 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 45 km/h (28 mph) or more for at least 120 seconds.

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

      Result
      Result Proceed to
      DTCs C1332, C1333, C1466 and C1467 are not output. A
      DTCs C1332, C1333, C1466 and/or C1467 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 before replacing parts Click here.


    B

    END

    A

  10. REPLACE REAR AXLE HUB AND BEARING ASSEMBLY


    1. Turn the ignition switch off.

    2. Replace the rear speed sensor rotor (rear axle hub and bearing assembly) Click here.

      Tech Tips

      If the rear speed sensor rotor needs to be replaced, replace the rear axle hub and bearing 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 45 km/h (28 mph) or more for at least 120 seconds.

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

      Result
      Result Proceed to
      DTCs C1332, C1333, C1466 and C1467 are not output. A
      DTCs C1332, C1333, C1466 and/or C1467 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 before replacing parts Click here.


    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    END