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

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 C1271/71 and C1272/72 are 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.

A01MK1UE02
DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1271/71 Low Output Signal of Front Speed Sensor RH (Test Mode DTC) - Detected only during Test Mode.

  • Front speed sensor RH

  • Sensor installation

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

 ABS Test Mode DTC
C1272/72 Low Output Signal of Front Speed Sensor LH (Test Mode DTC) - Detected only during Test Mode.

  • Front speed sensor LH

  • Sensor installation

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

 ABS Test Mode DTC
C1464/31 Front Speed Sensor RH Circuit

501

502

503

504

506

507

508

  • INF Code: 501


    • 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: 502


    • A malfunction occurs in 2 or more wheels.


  • INF Code: 503


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


  • INF Code: 504


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


  • INF Code: 506


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


  • INF Code: 507


    • 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: 508


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

  • INF Code: 501, 502, 504, 507


    • 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)


  • INF Code: 503


    • 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)


  • INF Code: 506, 508


    • Open or short in wire harness


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

 ABS DTC
C1465/32 Front Speed Sensor LH Circuit

511

512

513

514

516

517

518

  • INF Code: 511


    • 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: 512


    • A malfunction occurs in 2 or more wheels.


  • INF Code: 513


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


  • INF Code: 514


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


  • INF Code: 516


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


  • INF Code: 517


    • 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: 518


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

  • INF Code: 511, 512, 514, 517


    • 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)


  • INF Code: 513


    • 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)


  • INF Code: 516, 518


    • Open or short in wire harness


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

 ABS DTC

WIRING DIAGRAM

A01MIETE03

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
      FR Speed Open Front speed sensor RH open detection Error or Normal Normal: Normal Error: Momentary interruption
      FL Speed Open Front speed sensor LH open detection Error or Normal Normal: Normal Error: Momentary interruption

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      FR Speed Open
      FL Speed Open
      OK
      Normal (There are no momentary interruptions.)

      Tech Tips

      Perform the above inspection before removing the sensor and connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  2. READ VALUE USING GTS (FRONT 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
      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

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      FR Wheel Speed
      FL 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

    NG

    GO TO STEP 5 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

    NG

    GO TO STEP 5 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 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


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO STEP 10 Click here

  5. CHECK FRONT SPEED SENSOR INSTALLATION


    1. A01MJ6XC26
      *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 front steering knuckle.
      The installation bolt is tightened properly.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY Click here

    OK

  6. CHECK FRONT SPEED SENSOR TIP


    1. Remove the front speed sensor.

      Click here

    2. Check the front 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.

      • Check the speed sensor signal after cleaning or replacement.

        Click here

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR

    OK

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


    1. Install the front 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 A63 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Disconnect the A33 or A12 front 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
      A63-18 (FR+) - A33-2 (FR+) Always Below 1 Ω
      A63-18 (FR+) or A33-2 (FR+) - Body ground Always 10 kΩ or higher
      A63-5 (FR-) - A33-1 (FR-) Always Below 1 Ω
      A63-5 (FR-) or A33-1 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A63-31 (FL+) - A12-2 (FL+) Always Below 1 Ω
      A63-31 (FL+) or A12-2 (FL+) - Body ground Always 10 kΩ or higher
      A63-32 (FL-) - A12-1 (FL-) Always Below 1 Ω
      A63-32 (FL-) or A12-1 (FL-) - 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. A01MHLJC04
      *a

      Front view of wire harness connector

      (to Front Speed Sensor)
      *b for RH
      *c for LH

      Reconnect the A63 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
      A33-2 (FR+) - Body ground Power switch on (IG) 5.7 to 14 V
      for LH
      Tester Connection Switch Condition Specified Condition
      A12-2 (FL+) - Body ground Power switch on (IG) 5.7 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for RHD) B
      NG (for LHD) C

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    C

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    A

  9. RECONFIRM DTC


    1. Turn the power switch off.

    2. Reconnect the A33 or A12 front 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 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

    USE SIMULATION METHOD TO CHECK Click here

    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

      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 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

    END

    A

  12. REPLACE FRONT AXLE HUB SUB-ASSEMBLY


    1. Turn the power 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

      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 C1464/31 and/or C1465/32 are output (for RHD). A
      DTCs C1464/31 and/or C1465/32 are output (for LHD). 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


    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    C

    END