VEHICLE STABILITY CONTROL SYSTEM(for TMC Made), 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 C1403 and C1404 Click here.

DTC No. DTC Detection Condition Trouble Area

C1407

C1408

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 9.5 V or more, the sensor power supply voltage decreases for 0.5 seconds or more.

  • Rear speed sensor RH/LH

  • Skid control sensor wire RH/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 C1403 and C1404 Click here.

CAUTION / NOTICE / HINT

Note


  • When replacing the brake actuator assembly, perform zero point calibration Click here.

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to the DTC Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Speed Open RR speed sensor open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      RL Speed Open RL speed sensor open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      OK
      There are no momentary interruptions.

      Tech Tips

      Perform the above inspection before removing the sensor and connector.


    NG

    INSPECT SKID CONTROL SENSOR WIRE Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (REAR SPEED SENSOR)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

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

      ABS/VSC/TRC (Skid Control ECU)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Wheel Speed RR wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h When driving at constant speed: No large fluctuations
      RL Wheel Speed RL wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h When driving at constant speed: No large fluctuations

    4. Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester 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 intelligent tester 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.


    NG

    INSPECT SKID CONTROL SENSOR WIRE Click here

    OK

  3. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs Click here.

    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.

      Result
      Result Proceed to
      DTCs C1407 and C1408 are not output A
      DTCs C1407 and/or C1408 are output (for LHD) B
      DTCs C1407 and/or C1408 are output (for RHD) C

      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.


    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    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. Disconnect the skid control sensor wire connectors.

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

      Standard Resistance (for RH)
      Tester Connection Condition Specified Condition
      W1-2(+) - WK1-1 Always Below 1 Ω
      W1-1(-) - WK1-2 Always Below 1 Ω
      W1-2(+) - WK1-2 Always 10 kΩ or higher
      W1-2(+) - Body ground Always 10 kΩ or higher
      W1-1(-) - WK1-1 Always 10 kΩ or higher
      W1-1(-) - Body ground Always 10 kΩ or higher
      Standard Resistance (for LH)
      Tester Connection Condition Specified Condition
      V1-2(+) - VK1-1 Always Below 1 Ω
      V1-1(-) - VK1-2 Always Below 1 Ω
      V1-2(+) - VK1-2 Always 10 kΩ or higher
      V1-2(+) - Body ground Always 10 kΩ or higher
      V1-1(-) - VK1-1 Always 10 kΩ or higher
      V1-1(-) - Body ground Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement Click here.

    5. Reconnect the skid control sensor wire connector.


    NG

    REPLACE SKID CONTROL SENSOR WIRE

    OK

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)


    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 skid control ECU connector and the rear speed sensor connector.

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

      Standard Resistance (except LHD with CVT)
      Tester Connection Condition Specified Condition
      A54-17 (RR+) - W1-2 (+) Always Below 1 Ω
      A54-16 (RR-) - W1-1 (-) Always Below 1 Ω
      A54-5 (RL+) - V1-2 (+) Always Below 1 Ω
      A54-4 (RL-) - V1-1 (-) Always Below 1 Ω
      A54-17 (RR+) - Body ground Always 10 kΩ or higher
      A54-16 (RR-) - Body ground Always 10 kΩ or higher
      A54-5 (RL+) - Body ground Always 10 kΩ or higher
      A54-4 (RL-) - Body ground Always 10 kΩ or higher
      Standard Resistance (for LHD with CVT)
      Tester Connection Condition Specified Condition
      A56-17 (RR+) - W1-2 (+) Always Below 1 Ω
      A56-16 (RR-) - W1-1 (-) Always Below 1 Ω
      A56-5 (RL+) - V1-2 (+) Always Below 1 Ω
      A56-4 (RL-) - V1-1 (-) Always Below 1 Ω
      A56-17 (RR+) - Body ground Always 10 kΩ or higher
      A56-16 (RR-) - Body ground Always 10 kΩ or higher
      A56-5 (RL+) - Body ground Always 10 kΩ or higher
      A56-4 (RL-) - Body ground Always 10 kΩ or higher

    5. Reconnect the skid control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) (SENSOR INPUT)


    1. A01VJY9E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Rear Speed Sensor)

      Turn the ignition switch to ON.

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

      Standard Voltage (for RH)
      Tester Connection Switch Condition Specified Condition
      W1-2 (+) - Body ground Ignition switch ON 8 to 14 V
      Standard Voltage (for LH)
      Tester Connection Switch Condition Specified Condition
      V1-2 (+) - 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.

    3. Reconnect the rear speed sensor connector.

      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here