GSIC - Global Service Information Center

### 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

## for Preparation Click here

## DESCRIPTION

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

## 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

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

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)

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

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

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