ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1405, C1406

DTC Code DTC Name
C1405 Open or Short in Front Speed Sensor RH Circuit
C1406 Open or Short in Front Speed Sensor LH Circuit

DESCRIPTION

Refer to DTCs C1413 and C1414.

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DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1405 Open or Short in Front Speed Sensor RH Circuit

503

506

508

  • INF Code: 503


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

  • INF Code: 506


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

  • INF Code: 508


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

  • Front speed sensor RH

  • Wire harness or connector

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

 ABS DTC
C1406 Open or Short in Front Speed Sensor LH Circuit

513

516

518

  • INF Code: 513


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

  • INF Code: 516


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

  • INF Code: 518


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

  • Front speed sensor LH

  • Wire harness or connector

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

 ABS DTC

WIRING DIAGRAM

Refer to DTCs C1413 and C1414.

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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".

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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.

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      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Speed Open Front speed sensor RH open detection Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      FL Speed Open Front speed sensor LH open detection Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      FR Speed Open
      FL 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

    CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - FRONT SPEED SENSOR) Click here

    OK

  2. READ VALUE USING GTS (FRONT 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
      FR Wheel Speed Front 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
      FL Wheel Speed Front 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
      FR Wheel Speed
      FL 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 C1405 and C1406 are not output. A
      DTCs C1405 and/or C1406 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. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - FRONT SPEED SENSOR)


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

    4. Disconnect the A63 or A62 front speed sensor connector.

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

      OK
      No deformation or corrosion.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A32-3 (FR+) - A63-1 (FR+) Always Below 1 Ω
      A32-3 (FR+) or A63-1 (FR+) - Body ground Always 10 kΩ or higher
      A32-4 (FR-) - A63-2 (FR-) Always Below 1 Ω
      A32-4 (FR-) or A63-2 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A32-31 (FL+) - A62-1 (FL+) Always Below 1 Ω
      A32-31 (FL+) or A62-1 (FL+) - Body ground Always 10 kΩ or higher
      A32-32 (FL-) - A62-2 (FL-) Always Below 1 Ω
      A32-32 (FL-) or A62-2 (FL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A003NSBC24
      *A for RH
      *B for LH
      *a

      Front view of wire harness connector

      (to Front Speed Sensor)

      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
      A63-1 (FR+) - Body ground Power switch on (IG) 8 to 14 V
      for LH
      Tester Connection Condition Specified Condition
      A62-1 (FL+) - Body ground Power switch on (IG) 8 to 14 V

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT SPEED SENSOR 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