ABS (Antilock Brake System)

BRAKE CONTROL: ANTI-LOCK BRAKE 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 C1275/75 - Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)

DTC C1276/76 - Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)

DESCRIPTION

The speed sensor detects wheel speed and transmits the appropriate signals to the ECU. These signals are used for control of the ABS control system. The front and rear rotors have 48 serrations each.
When the rotors rotate, the magnetic field generated by the permanent magnet in the speed sensor induces an 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.
DTCs C1271/71 to C1276/76 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1271/71 to C1276/76 are output only in the Test Mode.

HINT:
- DTC No. C0200/31 and C1235/35 are for the front speed sensor RH.
- DTC No. C0205/32 and C1236/36 are for the front speed sensor LH.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)
(a) Select the Data List mode on Techstream.

ABS / VSC / TRAC:

(b) Check that there is the speed value output from the speed sensor displayed on Techstream and the speed value displayed on the speedometer are almost the same when driving the vehicle.
OK:
The speed value output from the speed sensor displayed on Techstream is the same as the actual vehicle speed.
NG -- INSPECT FRONT SPEED SENSOR INSTALLATION
OK -- Continue to next step.
2. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)
(a) Clear the DTC .
(b) Perform sensor signal check in TEST MODE PROCEDURE .
OK:
All Test Mode DTCs are erased.
OK -- RECONFIRM DTC
NG -- Continue to next step.
3. INSPECT FRONT SPEED SENSOR INSTALLATION

(a) Turn the ignition switch off.
(b) 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 N*m (82 kgf*cm, 71 in.*lbf)
NOTE: Check the speed sensor signal after replacement.

NG -- INSTALL FRONT SPEED SENSOR CORRECTLY
OK -- Continue to next step.
4. INSPECT 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 cleaning or replacement.

NG -- REPLACE DRIVE SHAFT ASSEMBLY
OK -- Continue to next step.
5. INSPECT FRONT SPEED SENSOR

(a) Install the front speed sensor.
(b) Disconnect the front speed sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

RH

NOTE: Check the speed sensor signal after replacement.

NG -- REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND FRONT SPEED SENSOR)

(a) Disconnect the skid control sensor wire.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

RH:

LH:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS

(a) Connect the oscilloscope to terminals FR+ - FR- or FL+ - FL- of the skid control ECU.
(b) Drive the vehicle at about 30 km/h(19 mph), and check the signal waveform.
OK:
A waveform as shown in the figure should be output.
HINT:
- As vehicle speed (wheel rotation speed) increases, the width of the waveform narrows and the fluctuation in the output voltage becomes greater.
- When noise is identified in the waveform on the oscilloscope, error signals are generated due to rotor scratches, looseness or foreign matter attached to the speed sensor.

NG -- INSPECT SPEED SENSOR ROTOR
OK -- Continue to next step.
8. RECONFIRM DTC
(a) Clear the DTCs .
(b) Drive the vehicle at a speed of approximately 32 km/h (20 mph) or more for 60 seconds or more.
(c) Check that the same DTCs are recorded .
HINT: Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result:

C -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
B -- END
A -- Continue to next step.
9. INSPECT SPEED SENSOR ROTOR
(a) Turn the ignition switch off.
(b) Remove the front drive shaft Removal.

(c) Check the rotor.
OK:
No scratches, oil, or foreign matter on the rotors.
NOTE: Check the speed sensor signal after cleaning or replacement .

NG -- CLEAN OR REPLACE DRIVE SHAFT ASSEMBLY
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY