ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1273/73, C1274/74, C1466/33, C1467/34

DTC Code DTC Name
C1273/73 Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1274/74 Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)
C1466/33 Rear Speed Sensor RH Circuit
C1467/34 Rear Speed Sensor LH Circuit

DESCRIPTION

Each speed sensor detects the wheel speed and sends the signals to the skid control ECU (brake booster with master cylinder assembly). These signals are used for ABS control.

DTCs C1273/73 and C1274/74 are cleared when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs C1273/73 and C1274/74 are output only in Test Mode.

B002HA8E05
DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1273/73 Low Output Signal of Rear Speed Sensor RH (Test Mode DTC) - Detected only during Test Mode.

  • for AWD:

    Rear speed sensor RH

  • for 2WD:

    Rear speed sensor RH (Rear axle hub and bearing assembly RH)

  • Sensor installation

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

 ABS Test Mode DTC
C1274/74 Low Output Signal of Rear Speed Sensor LH (Test Mode DTC) - Detected only during Test Mode.

  • for AWD:

    Rear speed sensor LH

  • for 2WD:

    Rear speed sensor LH (Rear axle hub and bearing assembly LH)

  • Sensor installation

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

 ABS Test Mode DTC
C1466/33 Rear Speed Sensor RH Circuit

521

522

523

524

526

527

528

  • INF Code: 521


    • At a vehicle speed of 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.


  • INF Code: 522


    • A malfunction occurs in 2 or more wheels.


  • INF Code: 523


    • An open is detected in the speed sensor signal circuit for 0.05 seconds or more.


  • INF Code: 524


    • Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.


  • INF Code: 526


    • When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more.


  • INF Code: 527


    • At a vehicle speed of 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more.


  • INF Code: 528


    • When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more.

  • INF Code: 521, 522, 524, 527


    • 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


    • Rear speed sensor RH


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


  • INF Code: 523


    • Open or short in speed sensor


    • Open or short in wire harness


    • Improperly connected connector, deformation or corrosion of terminals


    • Rear speed sensor RH


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


  • INF Code: 526, 528


    • Open or short in wire harness


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

 ABS DTC
C1467/34 Rear Speed Sensor LH Circuit

531

532

533

534

536

537

538

  • INF Code: 531


    • At a vehicle speed of 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.


  • INF Code: 532


    • A malfunction occurs in 2 or more wheels.


  • INF Code: 533


    • An open is detected in the speed sensor signal circuit for 0.05 seconds or more.


  • INF Code: 534


    • Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.


  • INF Code: 536


    • When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more.


  • INF Code: 537


    • At a vehicle speed of 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more.


  • INF Code: 538


    • When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more.

  • INF Code: 531, 532, 534, 537


    • 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


    • Rear speed sensor LH


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


  • INF Code: 533


    • Open or short in speed sensor


    • Open or short in wire harness


    • Improperly connected connector, deformation or corrosion of terminals


    • Rear speed sensor LH


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


  • INF Code: 536, 538


    • Open or short in wire harness


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

 ABS DTC

Tech Tips


  • DTCs C1466/33 and C1273/73 are for the rear speed sensor RH.

  • DTCs C1467/34 and C1274/74 are for the rear speed sensor LH.

WIRING DIAGRAM

B002JBDE02

CAUTION / NOTICE / HINT

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 GTS, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RR Speed Open Rear speed sensor RH open detection Error or Normal Normal: Normal Error: Momentary interruption
      RL Speed Open Rear speed sensor LH open detection Error or Normal Normal: Normal Error: Momentary interruption

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      RR Speed Open
      RL Speed Open
      OK
      There are no momentary interruptions.

      Tech Tips

      Perform the above inspection before removing the sensor and connector.

      Result
      Proceed to
      OK
      NG (for AWD)
      NG (for 2WD)

    NG (for AWD)

    GO TO STEP 5 Click here

    NG (for 2WD)

    GO TO STEP 14 Click here

    OK

  2. READ VALUE USING GTS (REAR SPEED SENSOR)


    1. Select the Data List on the GTS.

      Click here


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

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      RR Wheel Speed
      RL Wheel Speed

    2. 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 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 GTS is similar to the speed indicated on the speedometer.
      Result
      Proceed to
      OK
      NG (for AWD)
      NG (for 2WD)

    NG (for AWD)

    GO TO STEP 5 Click here

    NG (for 2WD)

    GO TO STEP 14 Click here

    OK

  3. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)


    1. Turn the power switch off.

    2. Perform the sensor check in Test Mode Procedure.

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      Signal Check
      OK
      All Test Mode DTCs are cleared.
      Result
      Proceed to
      OK
      NG (for AWD)
      NG (for 2WD)

    NG (for AWD)

    CHECK REAR SPEED SENSOR INSTALLATION Click here

    NG (for 2WD)

    CHECK REAR SPEED SENSOR INSTALLATION Click here

    OK

  4. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch on (READY).

    4. Perform a road test.

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1466/33 and C1467/34 are not output. A
      DTCs C1466/33 and/or C1467/34 are output. (for AWD) B
      DTCs C1466/33 and/or C1467/34 are output. (for 2WD) 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


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO STEP 10 Click here

    C

    GO TO STEP 19 Click here

  5. CHECK REAR SPEED SENSOR INSTALLATION


    1. B002H31C26
      *a No clearance
      *b OK
      *c NG

      Turn the power switch off.

    2. Check the speed sensor installation.

      Click here

      OK
      There is no clearance between the sensor and the rear axle carrier.
      The installation bolt is tightened properly.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL REAR SPEED SENSOR CORRECTLY Click here

    OK

  6. CHECK REAR SPEED SENSOR TIP


    1. Remove the rear speed sensor.

      Click here

    2. Check the rear speed sensor tip.

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

      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

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE REAR SPEED SENSOR

    OK

  7. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR SPEED SENSOR)


    1. Install the rear speed sensor.

      Click here

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

    3. Disconnect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Disconnect the P14 or Q8 rear speed sensor connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A57-22 (RR+) - P14-1 (RR+) Always Below 1 Ω
      A57-22 (RR+) or P14-1 (RR+) - Body ground Always 10 kΩ or higher
      A57-9 (RR-) - P14-2 (RR-) Always Below 1 Ω
      A57-9 (RR-) or P14-2 (RR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A57-20 (RL+) - Q8-1 (RL+) Always Below 1 Ω
      A57-20 (RL+) or Q8-1 (RL+) - Body ground Always 10 kΩ or higher
      A57-7 (RL-) - Q8-2 (RL-) Always Below 1 Ω
      A57-7 (RL-) or Q8-2 (RL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)


    1. B002ILNC13
      *A for RH
      *B for LH
      *a

      Front view of wire harness connector

      (to Rear Speed Sensor)

      Reconnect the A57 skid control ECU (brake booster with master cylinder assembly) 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
      P14-1 (RR+) - Body ground Power switch on (IG) 5.7 to 14 V
      for LH
      Tester Connection Switch Condition Specified Condition
      Q8-1 (RL+) - Body ground Power switch on (IG) 5.7 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

    OK

  9. RECONFIRM DTC


    1. Turn the power switch off.

    2. Reconnect the P14 or Q8 rear speed sensor connector.

    3. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    4. Turn the power switch on (READY).

    5. Perform a road test.

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1466/33 and/or C1467/34 are output. A
      DTCs C1466/33 and C1467/34 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

    USE SIMULATION METHOD TO CHECK Click here

    A

  10. REPLACE REAR SPEED SENSOR


    1. Turn the power switch off.

    2. Replace the rear speed sensor.

      Click here

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch on (READY).

    3. Perform a road test.

    4. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1466/33 and/or C1467/34 are output. A
      DTCs C1466/33 and C1467/33 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

    END

    A

  12. REPLACE REAR AXLE HUB AND BEARING ASSEMBLY


    1. Turn the power switch off.

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

      Click here

      Tech Tips

      The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.

      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

      Result
      Proceed to
      NEXT

    NEXT

  13. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch on (READY).

    3. Perform a road test.

    4. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1466/33 and/or C1467/33 are output. A
      DTCs C1466/33 and C1467/34 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


    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

    B

    END

  14. CHECK REAR SPEED SENSOR INSTALLATION


    1. B002J3WC09
      *a No clearance
      *b OK
      *c NG

      Turn the power switch off.

    2. Check the speed sensor installation.

      OK
      There is no clearance between the sensor and rear axle hub.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Click here

    OK

  15. INSPECT REAR SKID CONTROL SENSOR WIRE


    1. B002IEBC07
      *A for RH
      *B for LH
      *1 Rear Skid Control Sensor Wire
      *a

      Front view of wire harness connector

      (to Sensor Side Connector)
      *b

      Front view of wire harness connector

      (to Vehicle Side Connector)

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

    2. Disconnect the o1 or p1 rear skid control sensor wire connector.

    3. Disconnect the oP2 or pQ2 rear skid control sensor wire connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      o1-2 (+) - oP2-1 Always Below 1 Ω
      o1-2 (+) or oP2-1 - Body ground and other terminals Always 10 kΩ or higher
      o1-1 (-) - oP2-2 Always Below 1 Ω
      o1-1 (-) or oP2-2 - Body ground and other terminals Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      p1-2 (+) - pQ2-1 Always Below 1 Ω
      p1-2 (+) or pQ2-1 - Body ground and other terminals Always 10 kΩ or higher
      p1-1 (-) - pQ2-2 Always Below 1 Ω
      p1-1 (-) or pQ2-2 - Body ground and other terminals Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SKID CONTROL SENSOR WIRE Click here

    OK

  16. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR SPEED SENSOR)


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

    2. Reconnect the oP2 or pQ2 rear skid control sensor wire connector.

    3. Disconnect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A57-22 (RR+) - o1-2 (+) Always Below 1 Ω
      A57-22 (RR+) or o1-2 (+) - Body ground Always 10 kΩ or higher
      A57-9 (RR-) - o1-1 (-) Always Below 1 Ω
      A57-9 (RR-) or o1-1 (-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A57-20 (RL+) - p1-2 (+) Always Below 1 Ω
      A57-20 (RL+) or p1-2 (+) - Body ground Always 10 kΩ or higher
      A57-7 (RL-) - p1-1 (-) Always Below 1 Ω
      A57-7 (RL-) or p1-1 (-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)


    1. B002JJTC12
      *A for RH
      *B for LH
      *a

      Front view of wire harness connector

      (to Rear Speed Sensor)

      Reconnect the A57 skid control ECU (brake booster with master cylinder assembly) 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 Condition Specified Condition
      o1-2 (+) - Body ground Power switch on (IG) 5.7 to 14 V
      for LH
      Tester Connection Condition Specified Condition
      p1-2 (+) - Body ground Power switch on (IG) 5.7 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

    OK

  18. RECONFIRM DTC


    1. Turn the power switch off.

    2. Reconnect the o1 or p1 rear skid control sensor wire connector.

    3. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    4. Turn the power switch on (READY).

    5. Perform a road test.

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1466/33 and/or C1467/34 are output. A
      DTCs C1466/33 and C1467/34 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

    USE SIMULATION METHOD TO CHECK Click here

    A

  19. REPLACE REAR AXLE HUB AND BEARING ASSEMBLY


    1. Turn the power switch off.

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

      Click here

      Tech Tips

      The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.

      If the rear speed sensor rotor needs to be replaced, replace the rear axle hub and bearing assembly with rear speed sensor.

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  20. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch on (READY).

    3. Perform a road test.

    4. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1466/33 and/or C1467/34 are output. A
      DTCs C1466/33 and C1467/34 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


    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

    B

    END