ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ Vacuum Brake Booster), Diagnostic DTC:C1415, C1416

DTC Code DTC Name
C1415 Rear Speed Sensor RH Output Malfunction
C1416 Rear 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.

B006FS5E09
DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1415 Rear 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.

  • Rear speed sensor RH

  • Skid control sensor wire RH

  • Sensor installation

  • Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)

  • Skid control ECU (brake actuator assembly)

  • Wire harness or connector

 -
C1416 Rear 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.

  • Rear speed sensor LH

  • Skid control sensor wire LH

  • Speed sensor circuit

  • Sensor installation

  • Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)

  • Skid control ECU (brake actuator assembly)

  • Wire harness or connector

 -
C1415 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.

C1416 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

B006FORE02

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
      RR Speed Sensor Voltage Open Rear 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".
      RL Speed Sensor Voltage Open Rear 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
      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

    GO TO STEP 4 Click here

    OK

  2. READ VALUE USING GTS (REAR 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
      RR Wheel Speed Rear 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
      RL Wheel Speed Rear 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
      RR Wheel Speed
      RL 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

    NG

    CHECK REAR SPEED SENSOR INSTALLATION 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 C1415 and C1416 are not output. A
      DTCs C1415 and/or C1416 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 REAR SPEED SENSOR INSTALLATION


    1. Turn the engine switch off.

    2. B006F78C39
      *a Normal
      *b Abnormal
      *c Clearance

      Check the speed sensor installation.

      Click here

      OK
      There is no clearance between the sensor and rear axle carrier.
      The installation bolt is tightened properly.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL REAR SPEED SENSOR CORRECTLY Click here

    OK

  5. CHECK REAR SPEED SENSOR AND SENSOR ROTOR


    1. Remove the rear 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 REAR SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

    OK

  6. INSPECT SKID CONTROL SENSOR WIRE


    1. B006GRGC16
      *A for RH
      *B for LH
      *1 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)

      Install the rear speed sensor and the component with the speed sensor rotor.

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

    3. Disconnect the z24, L178, L175 and/or LL4 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
      z24 -2 (RR+) - L175 -3 (RR+) Always Below 1 Ω
      z24 -2 (RR+) - L175 -4 (RR-) Always 10 MΩ or higher
      z24 -2 (RR+) or L175 -3 (RR+) - Body ground Always 10 MΩ or higher
      z24 -1 (RR-) - L175 -4 (RR-) Always Below 1 Ω
      z24 -1 (RR-) - L175 -3 (RR+) Always 10 MΩ or higher
      z24 -1 (RR-) or L175 -4 (RR-) - Body ground Always 10 MΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      L178 -2 (RL+) - LL4 -3 Always Below 1 Ω
      L178 -2 (RL+) - LL4 -4 Always 10 MΩ or higher
      L178 -2 (RL+) or LL4 -3 - Body ground Always 10 MΩ or higher
      L178 -1 (RL-) - LL4 -4 Always Below 1 Ω
      L178 -1 (RL-) - LL4 -3 Always 10 MΩ or higher
      L178 -1 (RL-) or LL4 -4 - Body ground Always 10 MΩ or higher

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SKID CONTROL SENSOR WIRE Click here

    OK

  7. 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. 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
      A9-16 (RR+) - L175-3 (RR+) Always Below 1 Ω
      A9-16 (RR+) or L175-3 (RR+) - Body ground Always 10 kΩ or higher
      A9-15 (RR-) - L175-4 (RR-) Always Below 1 Ω
      A9-15 (RR-) or L175-4 (RR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A9-29 (RL+) - LL4 -3 Always Below 1 Ω
      A9-29 (RL+) or LL4 -3 - Body ground Always 10 kΩ or higher
      A9-28 (RL-) - LL4 -4 Always Below 1 Ω
      A9-28 (RL-) or LL4 -4 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)


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

    2. Reconnect the L175 or LL4 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 Condition Specified Condition
      z24-2 (RR+) - Body ground Engine switch on (IG) 11 to 14 V
      for LH
      Tester Connection Condition Specified Condition
      L178-2 (RL+) - 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 REAR SPEED SENSOR Click here

    NG

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