C0200

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0200/31: Front Speed Sensor RH Circuit

DTC C0200/31 - Front Speed Sensor RH Circuit

DTC C0205/32 - Front Speed Sensor LH Circuit

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

DTC C1271/71 - Low Output Signal of Front Speed Sensor RH (Test Mode DTC)

DTC C1272/72 - Low Output Signal of Front Speed Sensor LH (Test Mode DTC)

DTC C1273/73 - Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)

DTC C1274/74 - Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)

DESCRIPTION

The speed sensors detect wheel speed and send the signals to the ECU. These signals are used to control the ABS control system. Each of the front and rear rotors has 48 serrations.

When the rotors rotate, the magnetic field emitted by the permanent magnet in the speed sensor generates 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.

HINT:
- DTC C0200/31 and C1235/35 are for the right front speed sensor.
- DTC C0205/32 and C1236/36 are for the left front speed sensor.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (FRONT SPEED SENSOR)
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine.
(c) Select the Data List mode on the intelligent tester .

ABS / VSC:

(d) Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester and the speed value displayed on the speedometer when driving the vehicle.
OK:
There is almost no difference between the displayed speed value and the actual vehicle speed.
HINT: There is ±10% tolerance in the speedometer indication.

NG -- INSPECT FRONT SPEED SENSOR
OK -- Continue to next step.
2. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS
(a) INSPECTION USING OSCILLOSCOPE
(1) Connect the oscilloscope to terminals FR+ and FR- or FL+ and FL- of the skid control ECU.

(2) Drive the vehicle at approximately 19 mph (30 km/h), and check the signal waveform.
OK:
A waveform as shown in a figure should be output.
- As the vehicle speed (wheel revolution speed) increases, a cycle of the waveform narrows and the output voltage becomes greater.
- When noise is identified in the waveform on the oscilloscope, the erratic signals are generated due to scratches, looseness, or foreign matter on the speed sensor rotor.
NOTE: When replacing the brake actuator assembly, perform zero point calibration. Calibration

NG -- INSPECT FRONT SPEED SENSOR INSTALLATION
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY
3. INSPECT FRONT SPEED SENSOR
(a) Make sure that there is no looseness at the locking part and connecting part of the connector.
(b) Disconnect the front speed sensor connector.

(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH

NOTE: Check the speed sensor signal after replacement. Test Mode Procedure

NG -- REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR - SKID CONTROL ECU)
(a) Disconnect the skid control ECU connector and the front speed sensor connector.

(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT SPEED SENSOR - SKID CONTROL ECU)
OK -- Continue to next step.
5. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS
(a) INSPECTION USING OSCILLOSCOPE
(1) Connect the oscilloscope to terminals FR+ and FR- or FL+ and FL- of the skid control ECU.

(a) Check the speed sensor installation.
OK:
The installation bolt is tightened properly. There is no clearance between the sensor and the front steering knuckle.
Torque: 8.0 Nm (82 kgf-cm, 71 in-lbf)
NOTE: Check the speed sensor signal after replacement. Test Mode Procedure

NG -- REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.
7. INSPECT FRONT SPEED SENSOR TIP
(a) Remove the front speed sensor .
(b) Check the sensor tip.
OK:
No scratches or foreign matter on the sensor tip.
NOTE: Check the speed sensor signal after replacement. Test Mode Procedure

NG -- CLEAN OR REPLACE SPEED SENSOR
OK -- Continue to next step.
8. INSPECT SPEED SENSOR ROTOR
(a) Remove the front speed sensor rotor.

(b) Check the sensor rotor serrations.
OK:
No scratches, missing teeth, or foreign matter on the rotor.
HINT: If there is foreign matter on the rotors, remove it and check the output waveform after reassembly.
- Check the speed sensor signal after replacement. Test Mode Procedure
- When replacing the brake actuator assembly, perform zero point calibration. Calibration

NG -- REPLACE FRONT DRIVE SHAFT ASSEMBLY
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY