ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1407, C1408

DTC Code DTC Name
C1407 Open or Short in Rear Speed Sensor RH Circuit
C1408 Open or Short 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
C1407 Open or Short in Rear Speed Sensor RH Circuit

523

526

528

  • INF Code: 523


    • An open in the speed sensor signal circuit continues for 0.5 seconds or more.

  • INF Code: 526


    • The speed sensor power source voltage is low for 0.5 seconds or more.

  • INF Code: 528


    • The speed sensor power source voltage is low for 0.2 seconds, and does not return to normal for 60 seconds or more.

  • Skid control sensor wire RH

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

  • Wire harness or connector

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

 ABS DTC
C1408 Open or Short in Rear Speed Sensor LH Circuit

533

536

538

  • INF Code: 533


    • An open in the speed sensor signal circuit continues for 0.5 seconds or more.

  • INF Code: 536


    • The speed sensor power source voltage is low for 0.5 seconds or more.

  • INF Code: 538


    • The speed sensor power source voltage is low for 0.2 seconds, and does not return to normal for 60 seconds or more.

  • Skid control sensor wire LH

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

  • Wire harness or connector

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

 ABS DTC

WIRING DIAGRAM

Refer to DTCs C1415 and C1416.

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CAUTION / NOTICE / HINT

Note


  • After replacing the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".

    Click here

  • Disassembly of the rear speed sensor from the rear axle hub and bearing assembly is prohibited.

PROCEDURE


  1. READ VALUE USING GTS (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

      Error: Momentary interruption

      Normal: Normal

      		 -
      RL Speed Open Rear speed sensor LH open detection Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -

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

    2. Check for any momentary interruptions in the wire harness and connectors.

      OK
      There are no momentary interruptions.

      Note

      Perform the above inspection before removing the sensor and connector.

      Result
      Proceed to
      OK
      NG

    NG

    INSPECT SKID CONTROL SENSOR WIRE 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

    NG

    GO TO STEP 4 Click here

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (READY).

    4. Perform a road test.

    5. Check if the same DTC is output.

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      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1407 and C1408 are not output. A
      DTCs C1407 and/or C1408 are output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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

  4. INSPECT SKID CONTROL SENSOR WIRE


    1. A003LGSC33
      *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

  5. 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
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A003MZRC45
      *A for RH
      *B for LH
      *a

      Front view of wire harness connector

      (to Skid Control Sensor Wire)

      Reconnect the A32 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
      fN1-1 (RR+) - Body ground Power switch on (IG) 8 to 14 V
      for LH
      Tester Connection Condition Specified Condition
      eN1-1 (RL+) - Body ground Power switch on (IG) 8 to 14 V

      Note

      Check the speed sensor signal after replacement.

      Click here

      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

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