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. CLEAR DTC


    1. Clear the DTCs.


      Chassis > ABS/VSC/TRC > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT
  2. CHECK DTC


    1. Turn the power switch off.

    2. Turn the power switch on (IG).

    3. Check if the same DTC is output.


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      C1405 is output A
      C1406 is output B

    B
    A
  3. 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.


      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

      -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      FR Speed Open
    2. Check for any momentary interruptions in the wire harness and connectors.

      Note

      Perform the above inspection before removing the sensor and connector.

      Result
      Result Proceed to
      The value of FR Speed Open is always Normal A
      The value of FR Speed Open outputs Error one or more times B

    B
    A
  4. READ VALUE USING GTS (FRONT SPEED SENSOR RH)


    1. Select the Data List on the GTS.


      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

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      FR Wheel Speed
    2. Check the front speed sensor RH output value.

      Result
      Result Proceed to
      The value of FR Wheel Speed changes in accordance with the vehicle speed A
      Other than above B

    B
    A
  5. CLEAR DTC


    1. Clear the DTCs.


      Chassis > ABS/VSC/TRC > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT
  6. RECONFIRM DTC


    1. Turn the power switch off.

    2. Turn the power switch on (READY).

    3. Perform a road test.

    4. Check if the same DTC is output.


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      C1405 is not output A
      C1405 is output B

    A
    B
  7. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - FRONT SPEED SENSOR RH)


    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 A41 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Disconnect the A31 front speed sensor RH 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
      Tester Connection Condition Specified Condition
      A41-3 (FR+) - A31-1 (FR+) Always Below 1 Ω
      A41-3 (FR+) or A31-1 (FR+) - Body ground Always 10 kΩ or higher
      A41-4 (FR-) - A31-2 (FR-) Always Below 1 Ω
      A41-4 (FR-) or A31-2 (FR-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  8. INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)


    1. Reconnect the A41 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
      Tester Connection Condition Specified Condition
      A31-1 (FR+) - Body ground Power switch on (IG) 8 to 14 V

      Note

      Check the front speed sensor RH signal after replacement.

      Click here

      Result
      Proceed to
      OK
      NG

    OK
    NG
  9. 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.


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      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
      FL Speed Open
    2. Check for any momentary interruptions in the wire harness and connectors.

      Note

      Perform the above inspection before removing the sensor and connector.

      Result
      Result Proceed to
      The value of FL Speed Open is always Normal A
      The value of FL Speed Open outputs Error one or more times B

    B
    A
  10. READ VALUE USING GTS (FRONT SPEED SENSOR LH)


    1. Select the Data List on the GTS.


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      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
      FL Wheel Speed
    2. Check the front speed sensor LH output value.

      Result
      Result Proceed to
      The value of FL Wheel Speed changes in accordance with the vehicle speed A
      Other than above B

    B
    A
  11. CLEAR DTC


    1. Clear the DTCs.


      Chassis > ABS/VSC/TRC > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT
  12. RECONFIRM DTC


    1. Turn the power switch off.

    2. Turn the power switch on (READY).

    3. Perform a road test.

    4. Check if the same DTC is output.


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      C1406 is not output A
      C1406 is output B

    A
    B
  13. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - FRONT SPEED SENSOR LH)


    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 A41 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Disconnect the A15 front speed sensor LH 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
      Tester Connection Condition Specified Condition
      A41-31 (FL+) - A15-1 (FL+) Always Below 1 Ω
      A41-31 (FL+) or A15-1 (FL+) - Body ground Always 10 kΩ or higher
      A41-32 (FL-) - A15-2 (FL-) Always Below 1 Ω
      A41-32 (FL-) or A15-2 (FL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  14. INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)


    1. Reconnect the A41 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
      Tester Connection Condition Specified Condition
      A15-1 (FL+) - Body ground Power switch on (IG) 8 to 14 V

      Note

      Check the front speed sensor LH signal after replacement.

      Click here

      Result
      Proceed to
      OK
      NG

    OK
    NG