VEHICLE STABILITY CONTROL 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 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 +BS terminal voltage 9.5 V or more, the sensor power supply voltage decreases for 0.5 seconds or more.

  • Rear speed sensor RH

  • Wire harness or connector

  • 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 +BS terminal voltage 9.5 V or more, the sensor power supply voltage decreases for 0.5 seconds or more.

  • Rear speed sensor LH

  • Wire harness or connector

  • 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 C1415 and C1416.

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CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

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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 a DTC.

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      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RR Speed Sensor Voltage Open Rear speed sensor RH voltage open detection Error or Normal

      Error: Momentary interruption

      Normal: Normal

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

      Error: Momentary interruption

      Normal: Normal

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      RR Speed Sensor Voltage Open
      RL Speed Sensor Voltage Open
      OK
      Normal (There are no momentary interruptions.)

      Tech Tips

      Perform the above inspection before removing the sensor and connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR SPEED SENSOR) Click here

    OK

  2. READ VALUE USING GTS (REAR SPEED SENSOR)


    1. Select the Data List using the GTS.

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      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 (203 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 (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 value output from the speed sensor displayed on the GTS.

      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.

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      OK
      The speed value output from the speed sensor displayed on the GTS is similar to the speed indicated on the speedometer.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 4 Click here

    OK

  3. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs.

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      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the engine switch off.

    4. Start the engine.

    5. Perform a road test.

    6. 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

      Tech Tips

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

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    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here

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


    1. Turn the engine switch off.

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

    3. Disconnect the A94 skid control ECU (brake actuator assembly) connector.

    4. Disconnect the T16 or U24 rear speed sensor connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A94-16 (RR+) - T16-1 (RR+) Always Below 1 Ω
      A94-16 (RR+) or T16-1 (RR+) - Body ground Always 10 kΩ or higher
      A94-15 (RR-) - T16-2 (RR-) Always Below 1 Ω
      A94-15 (RR-) or T16-2 (RR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A94-29 (RL+) - U24-1 (RL+) Always Below 1 Ω
      A94-29 (RL+) or U24-1 (RL+) - Body ground Always 10 kΩ or higher
      A94-28 (RL-) - U24-2 (RL-) Always Below 1 Ω
      A94-28 (RL-) or U24-2 (RL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SUPPLY OUTPUT)


    1. B0074SKC52
      *A for RH
      *B for LH
      *a

      Front view of wire harness connector

      (to Rear Speed Sensor)

      Reconnect the A94 skid control ECU (brake actuator assembly) connector.

    2. Turn the engine 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
      T16-1 (RR+) - Body ground Engine switch on (IG) 8 to 14 V
      for LH
      Tester Connection Condition Specified Condition
      U24-1 (RL+) - Body ground Engine switch on (IG) 8 to 14 V

      Note

      Check the speed sensor signal after replacement.

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      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SPEED SENSOR Click here

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here