ANTI-LOCK 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 C1273, C1274, C1403 and C1404.

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DTC No. Detection Item DTC Detection Condition Trouble Area
C1407 Open or Short in Rear Speed Sensor RH Circuit

Either of the following is detected:


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

  2. With the IG1 terminal voltage at 9.5 V or higher, the sensor power supply voltage decreases for 0.5 seconds or more.

  • Rear speed sensor RH

  • Skid control sensor wire RH

  • Speed sensor circuit

  • Skid control ECU (Brake actuator assembly)
C1408 Open or Short in Rear Speed Sensor LH Circuit

Either of the following is detected:


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

  2. With the IG1 terminal voltage at 9.5 V or higher, the sensor power supply voltage decreases for 0.5 seconds or more.

  • Rear speed sensor LH

  • Skid control sensor wire LH

  • Speed sensor circuit

  • Skid control ECU (Brake actuator assembly)

Tech Tips


  • DTC C1407 is for the rear speed sensor RH.

  • DTC C1408 is for the rear speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1273, C1274, C1403 and C1404.

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CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and CVT oil pressure calibration (for continuously variable transaxle).

    K111: Click here

    K111F: Click here

  • Disassembly of the rear speed sensor from the rear axle hub and bearing assembly is prohibited (for 2WD).

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the GTS, check for any momentary interruption in the wire harness and connector corresponding to the 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 Normal or Error Normal Error: Momentary interruption
      RL Speed Open Rear speed sensor LH open detection Normal or Error 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 2WD)
      NG (for 4WD/AWD)

    NG (for 2WD)

    INSPECT SKID CONTROL SENSOR WIRE Click here

    NG (for 4WD/AWD)

    GO TO STEP 5 Click here

    OK

  2. READ VALUE USING GTS (REAR SPEED SENSOR)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

    5. According to the display on the GTS, read the Data List.


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RR Wheel Speed Rear wheel speed sensor RH reading Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph)

      When driving at constant speed:

      No large fluctuations
      RL Wheel Speed Rear wheel speed sensor LH reading Min.: 0 km/h (0 mph), Max.: 326.4 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

    6. Check that there is no difference between the speed value output from the speed sensor displayed on the GTS and the speed value displayed on the speedometer when driving the vehicle.

      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 the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

      Note

      Check the speed sensor signal after replacement.

      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 it together with the rear axle hub and bearing assembly with rear speed sensor.

      • If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step.

        Click here

      Result
      Proceed to
      OK
      NG (for 2WD)
      NG (for 4WD/AWD)

    NG (for 2WD)

    GO TO STEP 4 Click here

    NG (for 4WD/AWD)

    GO TO STEP 5 Click here

    OK

  3. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Start the engine.

    4. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

    5. Check if the same DTC is recorded.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step.

      Click here

      Result
      Proceed to
      DTCs C1407 and C1408 are not output
      DTCs C1407 and/or C1408 are output

    DTCs C1407 and C1408 are not output

    USE SIMULATION METHOD TO CHECK Click here

    DTCs C1407 and/or C1408 are output

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  4. INSPECT SKID CONTROL SENSOR WIRE


    1. Turn the ignition switch off.

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

    3. for RH:

      Disconnect the m1 and mM1 skid control sensor wire connectors.

    4. for LH:

      Disconnect the n1 and nN1 skid control sensor wire connectors.

    5. A01KCUDC05
      *A for RH
      *B for LH
      *a Front view of 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)

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      m1-2 (+) - mM1-1 Always Below 1 Ω
      m1-1 (-) - mM1-2 Always Below 1 Ω
      m1-2 (+) - mM1-2 Always 10 kΩ or higher
      m1-2 (+) or mM1-1 - Body ground Always 10 kΩ or higher
      m1-1 (-) - mM1-1 Always 10 kΩ or higher
      m1-1(-) or mM1-2 - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      n1-2 (+) - nN1-1 Always Below 1 Ω
      n1-1 (-) - nN1-2 Always Below 1 Ω
      n1-2 (+) - nN1-2 Always 10 kΩ or higher
      n1-2 (+) or nN1-1 - Body ground Always 10 kΩ or higher
      n1-1 (-) - nN1-1 Always 10 kΩ or higher
      n1-1 (-) or nN1-2 - Body ground Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SKID CONTROL SENSOR WIRE Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR SPEED SENSOR)


    1. for 2WD:


      1. Reconnect the mM1 and/or nN1 skid control sensor wire connector.

      2. Turn the ignition switch off.

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

      4. Disconnect the A63 skid control ECU (brake actuator assembly) connector.

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

        Standard Resistance
        for RH
        Tester Connection Condition Specified Condition
        A63-17 (RR+) - m1-2 (+) Always Below 1 Ω
        A63-16 (RR-) - m1-1 (-) Always Below 1 Ω
        A63-17 (RR+) or m1-2(+) - Body ground Always 10 kΩ or higher
        A63-16 (RR-) or m1-1 (-) - Body ground Always 10 kΩ or higher
        for LH
        Tester Connection Condition Specified Condition
        A63-5 (RL+) - n1-2 (+) Always Below 1 Ω
        A63-4 (RL-) - n1-1 (-) Always Below 1 Ω
        A63-5 (RL+) or n1-2 (+) - Body ground Always 10 kΩ or higher
        A63-4 (RL-) or n1-1 (-) - Body ground Always 10 kΩ or higher

    2. for 4WD/AWD:


      1. Turn the ignition switch off.

      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 actuator assembly) connector and the N11 and/or M20 rear speed sensor connector.

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

        Standard Resistance
        for RH
        Tester Connection Condition Specified Condition
        A63-17 (RR+) - M20-1 (RR+) Always Below 1 Ω
        A63-16 (RR-) - M20-2 (RR-) Always Below 1 Ω
        A63-17 (RR+) or M20-1(RR+) - Body ground Always 10 kΩ or higher
        A63-16 (RR-) or M20-2 (RR-) - Body ground Always 10 kΩ or higher
        for LH
        Tester Connection Condition Specified Condition
        A63-5 (RL+) - N11-1 (RL+) Always Below 1 Ω
        A63-4 (RL-) - N11-2 (RL-) Always Below 1 Ω
        A63-5 (RL+) or N11-1 (RL+) - Body ground Always 10 kΩ or higher
        A63-4 (RL-) or N11-2 (RL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)


    1. for 2WD:


      1. Reconnect the A63 skid control ECU (brake actuator assembly) connector.

      2. Turn the ignition switch to ON.

      3. A01KB9XC02
        *A for RH
        *B for LH
        *a

        Front view of wire harness connector

        (to Rear Speed Sensor)

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

        Standard Voltage
        for RH
        Tester Connection Switch Condition Specified Condition
        m1-2 (+) - Body ground Ignition switch ON 8 to 14 V
        for LH
        Tester Connection Switch Condition Specified Condition
        n1-2 (+) - Body ground Ignition switch ON 8 to 14 V

        Note

        Check the speed sensor signal after replacement.

        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.

        • If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step.

          Click here

    2. for 4WD/AWD:


      1. Reconnect the A63 skid control ECU (brake actuator assembly) connector.

      2. Turn the ignition switch to ON.

      3. A01KC43C01
        *A for RH
        *B for LH
        *a

        Front view of wire harness connector

        (to Rear Speed Sensor)

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

        Standard Voltage
        for RH
        Tester Connection Switch Condition Specified Condition
        M20-1 (RR+) - Body ground Ignition switch ON 8 to 14 V
        for LH
        Tester Connection Tester Connection Specified Condition
        N11-1 (RL+) - Body ground Ignition switch ON 8 to 14 V

        Note

        Check the speed sensor signal after replacement.

        Click here

        Tech Tips

        If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step.

        Click here

      Result
      Proceed to
      OK (for 2WD)
      OK (for 4WD/AWD)
      NG

    OK (for 2WD)

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Click here

    OK (for 4WD/AWD)

    REPLACE REAR SPEED SENSOR Click here

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here