ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ Vacuum Brake Booster), Diagnostic DTC:C1413, C1414

DTC Code DTC Name
C1413 Front Speed Sensor RH Output Malfunction
C1414 Front Speed Sensor LH Output Malfunction

DESCRIPTION

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU (brake actuator assembly). These signals are used for brake control.

Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change when the rotors turn.

Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU (brake actuator assembly).

Tech Tips

When the connectors between the speed sensor and skid control ECU (brake actuator assembly) are connected, the following waveform is output.

B006DYQE19
DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1413 Front Speed Sensor RH Output Malfunction

Any of the following is detected:


  • An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more.

  • At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds.

  • At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more.

  • Sensor installation

  • Front speed sensor RH*1

  • Front skid control sensor wire RH*2

  • Front speed sensor RH (front axle hub sub-assembly RH)*2

  • Front speed sensor rotor RH (front axle hub sub-assembly RH)

  • Skid control ECU (brake actuator assembly)

  • Wire harness or connector

 -
C1414 Front Speed Sensor LH Output Malfunction

Any of the following is detected:


  • An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more.

  • At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds.

  • At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more.

  • Sensor installation

  • Front speed sensor LH*1

  • Front skid control sensor wire RH*2

  • Front speed sensor LH (front axle hub sub-assembly LH)*2

  • Front speed sensor rotor LH (front axle hub sub-assembly LH)

  • Skid control ECU (brake actuator assembly)

  • Wire harness or connector

 -

C1413 DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition - - - -
Malfunction Status An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more ○ - -
At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds - ○ -
At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation - - ○
Detection Time - - 15 seconds or more.
Number of Trips 1 trip 1 trip 1 trip

Tech Tips

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

C1414 DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition - - - -
Malfunction Status An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more ○ - -
At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds - ○ -
At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation - - ○
Detection Time - - 15 seconds or more.
Number of Trips 1 trip 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

B006FORE06
B006ARVE08
for AWD
*a Front Speed Sensor RH
*b Front Speed Sensor LH
*c Skid Control ECU (Brake Actuator Assembly)

CAUTION / NOTICE / HINT

Note

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

Click here

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.

      Click here


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

      Error: Momentary interruption detected

      Normal: Momentary interruption not detected

      		 After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal".
      FL Speed Sensor Voltage Open Front speed sensor LH voltage open detection Error or Normal

      Error: Momentary interruption detected

      Normal: Momentary interruption not detected

      		 After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal".

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      FR Speed Sensor Voltage Open
      FL 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 (for 2WD)
      NG (for AWD)

    NG (for 2WD)

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    NG (for AWD)

    CHECK FRONT SPEED SENSOR INSTALLATION 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.

      Click here


      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.

      Click here

      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 (for 2WD)
      NG (for AWD)

    NG (for 2WD)

    GO TO STEP 4 Click here

    NG (for AWD)

    GO TO STEP 8 Click here

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      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.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1413 and C1414 are not output. A
      DTCs C1413 and/or C1414 are output. B

    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 FRONT SPEED SENSOR INSTALLATION


    1. Turn the engine switch off.

    2. B006BB0C07
      *1 Front Speed Sensor
      *a Correct
      *b Incorrect
      *c No clearance

      Check the speed sensor installation.

      Click here

      OK
      There is no clearance between the sensor and the front axle hub sub-assembly.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY Click here

    OK

  5. INSPECT FRONT SKID CONTROL SENSOR WIRE

    B006DBCC07
    *A for RH
    *B for LH
    *1 Front Skid Control Sensor Wire
    *a

    Front view of wire harness connector

    (to Vehicle Side Connector)
    *b

    Front view of wire harness connector

    (to Sensor Side Connector)

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

    2. Disconnect the z21, A16, A25 and/or AA3 front skid control sensor wire connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      z21 -1 (FR+) - A25 -5 (FR+) Always Below 1 Ω
      z21 -1 (FR+) or A25 -5 (FR+) - Body ground and other terminals Always 10 MΩ or higher
      z21 -2 (FR-) - A25 -1 (FR-) Always Below 1 Ω
      z21 -2 (FR-) or A25 -1 (FR-) - Body ground and other terminals Always 10 MΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A16 -2 (FL+) - AA3 -3 Always Below 1 Ω
      A16 -2 (FL+) or AA3 -3 - Body ground and other terminals Always 10 MΩ or higher
      A16 -1 (FL-) - AA3 -1 Always Below 1 Ω
      A16 -1 (FL-) or AA3 -1 - Body ground and other terminals Always 10 MΩ or higher

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SKID CONTROL SENSOR WIRE Click here

    OK

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


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

    2. Disconnect the A9 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A9-31 (FR+) - A25-5 (FR+) Always Below 1 Ω
      A9-31 (FR+) or A25-5 (FR+) - Body ground Always 10 kΩ or higher
      A9-30 (FR-) - A25-1 (FR-) Always Below 1 Ω
      A9-30 (FR-) or A25-1 (FR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A9-18 (FL+) - AA3 -3 Always Below 1 Ω
      A9-18 (FL+) or AA3 -3 - Body ground Always 10 kΩ or higher
      A9-17 (FL-) - AA3 -1 Always Below 1 Ω
      A9-17 (FL-) or AA3 -1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)


    1. Reconnect the A9 skid control ECU (brake actuator assembly) connector.

    2. Reconnect the AA3 or A25 front skid control sensor wire connector (for vehicle side connector).

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      for RH
      Tester Connection Switch Condition Specified Condition
      z21-1 (FR+) - Body ground Engine switch on (IG) 11 to 14 V
      for LH
      Tester Connection Switch Condition Specified Condition
      A16-2 (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
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY Click here

    NG

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

  8. CHECK FRONT SPEED SENSOR INSTALLATION


    1. Turn the engine switch off.

    2. B006F78C15
      *a Normal
      *b Abnormal
      *c Clearance

      Check the speed sensor installation.

      Click here

      OK
      There is no clearance between the sensor and the front steering knuckle.
      The installation bolt is tightened properly.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY Click here

    OK

  9. CHECK FRONT SPEED SENSOR AND SENSOR ROTOR


    1. Remove the front speed sensor and the component with the sensor rotor.

      for speed sensor: Click here

      for sensor rotor: Click here

    2. Check the speed sensor tip and speed sensor rotor.

      OK
      No scratches, oil, or foreign matter on the sensor tip and rotor.

      Note


      • If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

        If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.

      • Check the speed sensor signal after cleaning or replacement.

        Click here

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR)


    1. Install the front speed sensor and the component with the sensor rotor.

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

    3. Disconnect the A9 Skid control ECU (brake actuator assembly) connector.

    4. Disconnect the A72 or A73 front 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
      A9-31 (FR+) - A73-5 (FR+) Always Below 1 Ω
      A9-31 (FR+) or A73-5 (FR+) - Body ground Always 10 MΩ or higher
      A9-30 (FR-) - A73-1 (FR-) Always Below 1 Ω
      A9-30 (FR-) or A73-1 (FR-) - Body ground Always 10 MΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A9-18 (FL+) - A72-3 (FL+) Always Below 1 Ω
      A9-18 (FL+) or A72-3 (FL+) - Body ground Always 10 MΩ or higher
      A9-17 (FL-) - A72-1 (FL-) Always Below 1 Ω
      A9-17 (FL-) or A72-1 (FL-) - Body ground Always 10 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)


    1. Reconnect the A9 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
      A73-5 (FR+) - Body ground Engine switch on (IG) 11 to 14 V
      for LH
      Tester Connection Condition Specified Condition
      A72-3 (FL+) - Body ground Engine switch on (IG) 11 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 ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here