VEHICLE STABILITY CONTROL 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 DTC Detection Condition Trouble Area Note
C1405 Open or Short in Front Speed Sensor RH Circuit

Either of the following is detected:


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

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

  • Front speed sensor RH

  • Speed sensor circuit

  • Skid control ECU (brake actuator assembly)

  • Wire harness or connector

 -
C1406 Open or Short in Front Speed Sensor LH Circuit

Either of the following is detected:


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

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

  • Front speed sensor LH

  • Speed sensor circuit

  • Skid control ECU (brake actuator assembly)

  • Wire harness or connector

 -
C1405 DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status An open in the speed sensor signal circuit continues ○ -
With the +BS terminal voltage 9.5 V or more, the sensor power supply voltage decreases - ○
Detection Time 0.5 seconds or more. 0.5 seconds or more.
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

C1406 DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status An open in the speed sensor signal circuit continues ○ -
With the +BS terminal voltage 9.5 V or more, the sensor power supply voltage decreases - ○
Detection Time 0.5 seconds or more. 0.5 seconds or more.
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

Refer to DTCs C1413 and C1414.

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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
      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
      OK
      Normal (There are no momentary interruptions.)

      Tech Tips

      Perform the above inspection before removing the sensor and connector.

      Result
      Result
      OK
      NG

    NG

    INSPECT SKID CONTROL SENSOR WIRE Click here

    OK

  2. READ VALUE USING GTS (FRONT SPEED SENSOR)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. 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
      FR Wheel Speed Front wheel speed sensor RH reading Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
      FL Wheel Speed Front wheel speed sensor LH reading Min.: 0 km/h (0 mph), Max.: 326 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
      FR Wheel Speed
      FL Wheel Speed

    5. 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 pressure, 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
      Result
      OK
      NG

    NG

    GO TO STEP 4 Click here

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs.

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      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the engine switch off.

    3. Start the engine.

    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. (for LHD) B
      DTCs C1405 and/or C1406 are output. (for RHD) C

      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 Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  4. INSPECT SKID CONTROL SENSOR WIRE


    1. B002EIEC11
      *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)
      *d for RH
      *e for LH

      Turn the engine switch off.

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

    3. Disconnect the A46, A47, m1 and/or n1 skid control sensor wire connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      m1-2 (FR+) - A47-1 (FR+) Always Below 1 Ω
      m1-2 (FR+) - A47-2 (FR-) Always 10 kΩ or higher
      m1-2 (FR+) or A47-1 (FR+) - Body ground Always 10 kΩ or higher
      m1-1 (FR-) - A47-2 (FR-) Always Below 1 Ω
      m1-1 (FR-) - A47-1 (FR+) Always 10 kΩ or higher
      m1-1 (FR-) or A47-2 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      n1-2 (FL+) - A46-1 (FL+) Always Below 1 Ω
      n1-2 (FL+) - A46-2 (FL-) Always 10 kΩ or higher
      n1-2 (FL+) or A46-1 (FL+) - Body ground Always 10 kΩ or higher
      n1-1 (FL-) - A46-2 (FL-) Always Below 1 Ω
      n1-1 (FL-) - A46-1 (FL+) Always 10 kΩ or higher
      n1-1 (FL-) or A46-2 (FL-) - Body ground Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement.

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      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SKID CONTROL SENSOR WIRE Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SKID CONTROL SENSOR WIRE)


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

    2. Reconnect the A46 or A47 skid control sensor wire connector (for vehicle side connector).

    3. Disconnect the A52 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A52-31 (FR+) - m1-2 (FR+) Always Below 1 Ω
      A52-31 (FR+) or m1-2 (FR+) - Body ground Always 10 kΩ or higher
      A52-30 (FR-) - m1-1 (FR-) Always Below 1 Ω
      A52-30 (FR-) or m1-1 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A52-18 (FL+) - n1-2 (FL+) Always Below 1 Ω
      A52-18 (FL+) or n1-2 (FL+) - Body ground Always 10 kΩ or higher
      A52-17 (FL-) - n1-1 (FL-) Always Below 1 Ω
      A52-17 (FL-) or n1-1 (FL-) - 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. B002CH2C58
      *a

      Front view of wire harness connector

      (to Sensor Side Connector)
      *b for RH
      *c for LH

      Reconnect the A52 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 Switch Condition Specified Condition
      m1-2 (FR+) - Body ground Engine switch on (IG) 11 to 14 V
      for LH
      Tester Connection Switch Condition Specified Condition
      n1-2 (FL+) - Body ground Engine switch on (IG) 11 to 14 V

      Tech Tips

      The front speed sensor rotor and front speed sensor are incorporated into the front axle hub sub-assembly.

      If the front speed sensor rotor needs to be replaced, replace the front axle hub sub-assembly with front speed sensor.

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

    A

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here