DTC    C0200/31    Right Front Wheel Speed Sensor Signal Malfunction

DTC    C0205/32    Left Front Wheel Speed Sensor Signal Malfunction

DTC    C1235/35    Foreign Object is Attached on Tip of Front Speed Sensor RH

DTC    C1236/36    Foreign Object is Attached on Tip of Front Speed Sensor LH

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DESCRIPTION


C108865E02

The speed sensor detects wheel speed and transmits the appropriate signals to the ECU. These signals are used for control of the ABS.
Each of the front and rear rotors have 48 serrations. When the rotors rotate, the magnetic field generated by the permanent magnet in the speed sensor produces AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.

DTC No.
DTC Detection Condition
Trouble Area
C0200/31
C0205/32
When one of following occurs
  1. With vehicle speed at 10 km/h (6 mph) or more, sensor signal circuit of faulty wheel is open or short for 1 sec. or more
  2. Momentary interruption of sensor signal of faulty wheel has occurred 7 times or more
  3. Sensor signal circuit is open for 0.5 sec. or more
  1. Front speed sensor
  2. Front speed sensor circuit
  3. Speed sensor rotor
  4. Sensor installation
C1235/35
C1236/36
At vehicle speed of 20 km/h (12 mph) or more, condition that noise is included in speed sensor signal continues for 5 sec. or more.
  1. Front speed sensor
  2. Front speed sensor circuit
  3. Sensor installation

HINT:
  1. DTCs C0200/31 and C1235/35 are for the front speed sensor RH.
  2. DTCs C0205/32 and C1236/36 are for the front speed sensor LH.


WIRING DIAGRAM


C108857E03


INSPECTION PROCEDURE

1.CHOOSE DIAGNOSIS METHOD

  1. Choose the diagnosis method.
    Method 
    Method
    		Proceed to
    Using intelligent tester
    		A
    Not using intelligent tester
    		B



B
Go to step 3
A


2.READ VALUE OF INTELLIGENT TESTER (FRONT SPEED SENSOR)

  1. Check Data List for proper functioning of the front speed sensor.

    Skid control ECU 
    Item
    		Measurement Item / Range (Display)
    		Normal Condition
    		Diagnostic Note
    FR Wheel Speed
    		Wheel speed sensor (FR)
    reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)
    		Actual wheel speed
    		Speed similar to that of speedometer
    FL Wheel Speed
    		Wheel speed sensor (FL)
    reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)
    		Actual wheel speed
    		Speed similar to that of speedometer

    OK:
    There is almost no difference between actual wheel speed and displayed speed value.

    HINT:
    There is a tolerance of +- 10 % in the speedometer indication.



NG
Go to step 4
OK


3.INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS
C108867E01

  1. Connect an oscilloscope to terminals 31 (FR+) and 30 (FR-), and 9 (FL+) and 8 (FL-) of the S2 skid control ECU connector.

  1. Drive the vehicle at about 30 km/h (19 mph), and check the signal waveform.

    OK:
    A waveform is output, as shown in the illustration.

    HINT:
    1. As vehicle speed (wheel revolution speed) increases, the wavelength shortens and the fluctuation in the output voltage becomes greater.
    2. Scratches, looseness or foreign matter on the speed sensor rotor cause noise (errors) in the signal waveform.



NG
Go to step 8
OK

REPLACE BRAKE ACTUATOR ASSEMBLY 

4.INSPECT FRONT SPEED SENSOR
C108868E01

  1. Disconnect the S4 and S5 sensor connectors.

  1. Measure the resistance of the speed sensors.

    Standard resistance:
    LH:
    Tester Connection
    		Specified Condition
    1 (FL+) - 2 (FL-)
    		0.6 to 1.8 kΩ
    1 (FL+) - Body ground
    		10 kΩ or higher
    2 (FL-) - Body ground
    		10 kΩ or higher
    RH:
    Tester Connection
    		Specified Condition
    1 (FR+) - 2 (FR-)
    		0.6 to 1.8 kΩ
    1 (FR+) - Body ground
    		10 kΩ or higher
    2 (FR-) - Body ground
    		10 kΩ or higher

    HINT:
    Check the speed sensor signal after the speed sensor replacement.



NG
REPLACE FRONT SPEED SENSOR
OK


5.CHECK WIRE HARNESS (SKID CONTROL ECU - FRONT SPEED SENSOR)
C108869E01

  1. Disconnect the S2 ECU connector.

  1. Disconnect the S4 and S5 speed sensor connectors.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    LH:
    Tester Connection
    		Specified Condition
    S2-9 (FL+) - S4-1 (FL+)
    		Below 1 Ω
    S2-8 (FL-) - S4-2 (FL-)
    		Below 1 Ω
    S4-1 (FL+) - Body ground
    		10 kΩ or higher
    S4-2 (FL-) - Body ground
    		10 kΩ or higher
    RH:
    Tester Connection
    		Specified Condition
    S2-31 (FR+) - S5-1 (FR+)
    		Below 1 Ω
    S2-30 (FR-) - S5-2 (FR-)
    		Below 1 Ω
    S5-1 (FR+) - Body ground
    		10 kΩ or higher
    S5-2 (FR-) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


6.INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS
C108867E01

  1. Connect an oscilloscope to terminals 31 (FR+) and 30 (FR-), and 9 (FL+) and 8 (FL-) of the S2 skid control ECU connector.

  1. Drive the vehicle at about 30 km/h (19 mph), and check the signal waveform.

    OK:
    A waveform is output, as shown in the illustration.

    HINT:
    1. As vehicle speed (wheel revolution speed) increases, the wavelength shortens and the fluctuation in the output voltage becomes greater.
    2. Scratches, looseness or foreign matter on the speed sensor rotor cause noise (errors) in the signal waveform.



NG
Go to step 8
OK


7.CHECK IF DTC OUTPUT RECURS

  1. Clear the DTCs.

  1. Drive the vehicle at approximately 30 km/h (19 mph) or more for 60 seconds or more.

  1. Check for DTCs.
    Result 
    Result
    		Proceed to
    DTC is output
    		A
    DTC is not output
    		B



B
END
A

REPLACE BRAKE ACTUATOR ASSEMBLY 

8.INSPECT FRONT SPEED SENSOR INSTALLATION
C108871E01

  1. Check the speed sensor installation.

    OK:
    The installation bolt is tightened properly.
    There is no clearance between the sensor and front steering knuckle.
    Torque:
    8.0 N*m (82 kgf*cm, 71 in.*lbf)

    HINT:
    Check the speed sensor signal after the speed sensor replacement.



NG
SECURELY REINSTALL SENSOR
OK


9.INSPECT SPEED SENSOR TIP

  1. Remove the front speed sensor.

  1. Check the sensor tip.

    OK:
    No scratches or foreign matter on sensor tip.

    HINT:
    Check the speed sensor signal after cleaning or replacing the speed sensor.



NG
CLEAN OR REPLACE SPEED SENSOR
OK


10.INSPECT SPEED SENSOR ROTOR

  1. Remove the front axle hub.

  1. Check the sensor rotor serrations.

    OK:
    No scratches, missing teeth or foreign matter on sensor rotor.

    HINT:
    1. If foreign matter is attached, remove it and check the output waveform after reassembly.
    2. Check the speed sensor signal after cleaning or replacing the speed sensor rotor.



NG
CLEAN OR REPLACE SPEED SENSOR ROTOR
OK


11.CHECK IF DTC OUTPUT RECURS

  1. Clear the DTCs.

  1. Drive the vehicle at approximately 30 km/h (19 mph) or more for 60 seconds or more.

  1. Check for DTCs.
    Result 
    Result
    		Proceed to
    DTC is output
    		A
    DTC is not output
    		B



NG
END
A

REPLACE BRAKE ACTUATOR ASSEMBLY