ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1401, C1402

DTC Code DTC Name
C1401 Malfunction in Front Speed Sensor RH Circuit
C1402 Malfunction in Front Speed Sensor LH Circuit

DESCRIPTION

Refer to DTCs C1413 and C1414.

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DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1401 Malfunction in Front Speed Sensor RH Circuit

501

502

507

  • INF Code: 501


    • At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more.

  • INF Code: 502


    • At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more. (except when both rear speed sensors are 0 km/h (0 mph)).

  • INF Code: 507


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

  • Front speed sensor RH

  • Speed sensor installed improperly

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

 ABS DTC
C1402 Malfunction in Front Speed Sensor LH Circuit

511

512

517

  • INF Code: 511


    • At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more.

  • INF Code: 512


    • At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more. (except when both rear speed sensors are 0 km/h (0 mph)).

  • INF Code: 517


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

  • Front speed sensor LH

  • Speed sensor installed improperly

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

 ABS DTC

WIRING DIAGRAM

Refer to DTCs C1413 and C1414.

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PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.


      Chassis > ABS/VSC/TRC > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK DTC


    1. Turn the power switch off.

    2. Turn the power switch on (IG).

    3. Check if the same DTC is output.


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      C1401 is output A
      C1402 is output B

    B

    CHECK FRONT SPEED SENSOR LH INSTALLATION Click here

    A

  3. CHECK FRONT SPEED SENSOR RH INSTALLATION


    1. B004QBOC29
      *1 Front Speed Sensor RH
      *a OK
      *b NG
      *c 8.5 N*m
      *d No Clearance

      Check the front speed sensor RH 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)
      Result
      Proceed to
      OK
      NG

    NG

    REINSTALL OR REPLACE FRONT SPEED SENSOR RH Click here

    OK

  4. CHECK FRONT SPEED SENSOR RH (CHECK FOR FOREIGN MATTER)


    1. Remove the front speed sensor RH.

      Tech Tips

      Click here

    2. Check the front speed sensor tip RH.

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

      Note


      • If there is oil or foreign matter on the front speed sensor RH, clean the front speed sensor RH.

      • If the front speed sensor RH is damaged, replace the front speed sensor RH with a new one.

      • Check the front speed sensor RH signal after cleaning or replacement.

        Click here

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR RH

    OK

  5. READ VALUE USING GTS (FRONT SPEED SENSOR RH)


    1. Install the front speed sensor RH.

    2. Select the Data List on the GTS.


      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.: 326.4 km/h (203 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

    3. Check the front speed sensor RH output value.

      Result
      Result Proceed to
      The value of FR Wheel Speed changes in accordance with the vehicle speed A
      Other than above B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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


    1. Turn the power switch off.

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

      OK
      The connector is securely connected.

    3. Disconnect the A41 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Disconnect the A31 front speed sensor RH connector.

    5. Check both the connector case and the terminals for deformation and corrosion.

      OK
      No deformation or corrosion.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A41-3 (FR+) - A31-1 (FR+) Always Below 1 Ω
      A41-3 (FR+) or A31-1 (FR+) - Body ground Always 10 kΩ or higher
      A41-4 (FR-) - A31-2 (FR-) Always Below 1 Ω
      A41-4 (FR-) or A31-2 (FR-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK FRONT SPEED SENSOR ROTOR RH (CHECK FOR FOREIGN MATTER)


    1. Remove the front speed sensor RH and the component with the front speed sensor rotor RH.

      Tech Tips

      for Front Speed Sensor RH: Click here

      for Front Speed Sensor Rotor RH: Click here

    2. Check the front speed sensor rotor RH.

      OK
      The front speed sensor rotor RH is free of scratches, oil, and foreign matter.

      Note


      • If there is oil or foreign matter on the front speed sensor rotor RH, clean the front speed sensor rotor RH.

      • If the front speed sensor rotor RH is damaged, replace the front speed sensor rotor RH with a new one.

      • Check the front speed sensor RH signal after cleaning or replacement.

        Click here

      Tech Tips


      • The front speed sensor rotor RH is incorporated into the front axle hub sub-assembly RH.

      • If the front speed sensor rotor RH needs to be replaced, replace it together with the front axle hub sub-assembly RH.

      Result
      Result Proceed to
      OK A
      NG (The front speed sensor rotor RH is damaged.) B
      NG (There is foreign matter on the front speed sensor rotor RH.) C

    A

    REPLACE FRONT SPEED SENSOR RH Click here

    B

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY RH Click here

    C

    CLEAN FRONT SPEED SENSOR ROTOR RH

  8. CHECK FRONT SPEED SENSOR LH INSTALLATION


    1. B004QBOC29
      *1 Front Speed Sensor LH
      *a OK
      *b NG
      *c 8.5 N*m
      *d No Clearance

      Check the front speed sensor LH 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)
      Result
      Proceed to
      OK
      NG

    NG

    REINSTALL OR REPLACE FRONT SPEED SENSOR LH Click here

    OK

  9. CHECK FRONT SPEED SENSOR LH (CHECK FOR FOREIGN MATTER)


    1. Remove the front speed sensor LH.

      Tech Tips

      Click here

    2. Check the front speed sensor tip LH.

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

      Note


      • If there is oil or foreign matter on the front speed sensor LH, clean the front speed sensor LH.

      • If the front speed sensor LH is damaged, replace the front speed sensor LH with a new one.

      • Check the front speed sensor LH signal after cleaning or replacement.

        Click here

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR LH

    OK

  10. READ VALUE USING GTS (FRONT SPEED SENSOR LH)


    1. Install the front speed sensor LH.

    2. Select the Data List on the GTS.


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FL Wheel Speed Front speed sensor LH Min.: 0 km/h (0 mph), Max.: 326.4 km/h (203 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations

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

    3. Check the front speed sensor LH output value.

      Result
      Result Proceed to
      The value of FL Wheel Speed changes in accordance with the vehicle speed A
      Other than above B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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


    1. Turn the power switch off.

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

      OK
      The connector is securely connected.

    3. Disconnect the A41 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Disconnect the A15 front speed sensor LH connector.

    5. Check both the connector case and the terminals for deformation and corrosion.

      OK
      No deformation or corrosion.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A41-31 (FL+) - A15-1 (FL+) Always Below 1 Ω
      A41-31 (FL+) or A15-1 (FL+) - Body ground Always 10 kΩ or higher
      A41-32 (FL-) - A15-2 (FL-) Always Below 1 Ω
      A41-32 (FL-) or A15-2 (FL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK FRONT SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER)


    1. Remove the front speed sensor LH and the component with the front speed sensor rotor LH.

      Tech Tips

      for Front Speed Sensor LH: Click here

      for Front Speed Sensor Rotor LH: Click here

    2. Check the front speed sensor rotor LH.

      OK
      The front speed sensor rotor LH is free of scratches, oil, and foreign matter.

      Note


      • If there is oil or foreign matter on the front speed sensor rotor LH, clean the front speed sensor rotor LH.

      • If the front speed sensor rotor LH is damaged, replace the front speed sensor rotor LH with a new one.

      • Check the front speed sensor LH signal after cleaning or replacement.

        Click here

      Tech Tips


      • The front speed sensor rotor LH is incorporated into the front axle hub sub-assembly LH.

      • If the front speed sensor rotor LH needs to be replaced, replace it together with the front axle hub sub-assembly LH.

      Result
      Result Proceed to
      OK A
      NG (The front speed sensor rotor LH is damaged.) B
      NG (There is foreign matter on the front speed sensor rotor LH.) C

    A

    REPLACE FRONT SPEED SENSOR LH Click here

    B

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY LH Click here

    C

    CLEAN FRONT SPEED SENSOR ROTOR LH