ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1403, C1404

DTC Code DTC Name
C1403 Malfunction in Rear Speed Sensor RH Circuit
C1404 Malfunction in Rear Speed Sensor LH Circuit

DESCRIPTION

Refer to DTCs C1415 and C1416.

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DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1403 Malfunction in Rear Speed Sensor RH Circuit

521

522

527

  • INF Code: 521


    • 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: 522


    • At a vehicle speed of 10 km/h (6 mph) or more, outputs from both 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: 527


    • 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.

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

  • Speed sensor installed improperly

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

 ABS DTC
C1404 Malfunction in Rear Speed Sensor LH Circuit

531

532

537

  • INF Code: 531


    • 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: 532


    • At a vehicle speed of 10 km/h (6 mph) or more, outputs from both 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: 537


    • 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.

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

  • Speed sensor installed improperly

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

 ABS DTC

WIRING DIAGRAM

Refer to DTCs C1415 and C1416.

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PROCEDURE


  1. CHECK REAR SPEED SENSOR INSTALLATION


    1. A003NVKC07
      *1 Rear Speed Sensor
      *a OK
      *b NG
      *c No Clearance

      Check the speed sensor installation.

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

      Tech Tips

      Because the rear axle hub and bearing assembly cannot be disassembled, if the rear speed sensor needs replacement, replace the rear axle hub and bearing assembly.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY 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.: 326.4 km/h (203 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.: 326.4 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
      RR Wheel Speed
      RL Wheel Speed

    2. Check the speed sensor output value.

      OK
      The output value changes in accordance with the vehicle speed.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. INSPECT SKID CONTROL SENSOR WIRE


    1. A003LGSC32
      *A for RH
      *B for LH
      *a Front view of rear skid control sensor wire
      *b

      Front view of wire harness connector

      (to Sensor Side Connector)
      *c

      Front view of wire harness connector

      (to Vehicle Side Connector)

      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. Remove the rear skid control sensor wire RH or the rear skid control sensor wire LH.

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

      OK
      No deformation or corrosion.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      f1-2 (RR+) - fN1-1 (RR+) Always Below 1 Ω
      f1-2 (RR+) - fN1-2 (RR-) Always 10 kΩ or higher
      f1-2 (RR+) or fN1-1 (RR+) - Body ground Always 10 kΩ or higher
      f1-1 (RR-) - fN1-2 (RR-) Always Below 1 Ω
      f1-1 (RR-) - fN1-1 (RR+) Always 10 kΩ or higher
      f1-1 (RR-) or fN1-2 (RR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      e1-2 (RL+) - eN1-1 (RL+) Always Below 1 Ω
      e1-2 (RL+) - eN1-2 (RL-) Always 10 kΩ or higher
      e1-2 (RL+) or eN1-1 (RL+) - Body ground Always 10 kΩ or higher
      e1-1 (RL-) - eN1-2 (RL-) Always Below 1 Ω
      e1-1 (RL-) - eN1-1 (RL+) Always 10 kΩ or higher
      e1-1 (RL-) or eN1-2 (RL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SKID CONTROL SENSOR WIRE

    OK

  4. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - SKID CONTROL SENSOR WIRE)


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

      OK
      The connector is securely connected.

    2. Disconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector.

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

      OK
      No deformation or corrosion.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A32-7 (RR+) - fN1-1 (RR+) Always Below 1 Ω
      A32-7 (RR+) or fN1-1 (RR+) - Body ground Always 10 kΩ or higher
      A32-8 (RR-) - fN1-2 (RR-) Always Below 1 Ω
      A32-8 (RR-) or fN1-2 (RR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A32-34 (RL+) - eN1-1 (RL+) Always Below 1 Ω
      A32-34 (RL+) or eN1-1 (RL+) - Body ground Always 10 kΩ or higher
      A32-35 (RL-) - eN1-2 (RL-) Always Below 1 Ω
      A32-35 (RL-) or eN1-2 (RL-) - Body ground Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement.

      Tech Tips

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

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

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR