C1275

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0210/33: Rear Speed Sensor RH Circuit

DTC C0210/33 - Rear Speed Sensor RH Circuit

DTC C0215/34 - Rear Speed Sensor LH Circuit

DTC C1238/38 - Foreign Object is Attached on Tip of Rear Speed Sensor RH

DTC C1239/39 - Foreign Object is Attached on Tip of Rear Speed Sensor LH

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)

DTC C1277/77 - Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)

DTC C1278/78 - Abnormal Change in 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 C0210/33 and C1238/38 are for the right rear speed sensor.
- DTC C0215/34 and C1239/39 are for the left rear speed sensor.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (REAR 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 by 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 REAR 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 RR+ and RR- or RL+ and RL- 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 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 REAR SPEED SENSOR INSTALLATION
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY
3. INSPECT REAR SPEED SENSOR
(a) 2WD
(1) Disconnect the rear speed sensor connector.

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

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

(b) 4WD
(1) Remove the seat cushion seat back.
(2) Disconnect the rear speed sensor connector.

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

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

Result:

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

C -- REPLACE REAR SPEED SENSOR
B -- REPLACE REAR SPEED SENSOR
A -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (REAR SPEED SENSOR - SKID CONTROL ECU)
(a) Disconnect the skid control ECU connector and the rear 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 (REAR 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 RR+ and RR- or RL+ and RL- 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 REAR SPEED SENSOR INSTALLATION
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY
6. INSPECT REAR SPEED SENSOR INSTALLATION
(a) 2WD

(1) Check the sensor installation.
OK:
There is no clearance between the sensor and rear axle carrier.
(b) 4WD

(1) Check the sensor installation.
OK:
There is no clearance between the sensor and rear axle carrier.
The installation bolt is tightened properly.
Torque: 8.0 Nm (82 kgf-cm, 71 in-lbf)
Result:

(a) Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign objects on the rotor.
Result:

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

D -- REPLACE REAR DRIVE SHAFT ASSEMBLY
C -- REPLACE REAR DRIVE SHAFT ASSEMBLY
B -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY
A -- Continue to next step.
8. INSPECT REAR SPEED SENSOR TIP
(a) Remove the rear speed sensor for 2WD, for 4WD).
(b) Check the sensor tip.
OK:
No scratches or foreign matter on the sensor tip.
Result:

NOTICE:
- Check the speed sensor signal after replacement. Test Mode Procedure
- When replacing the brake actuator assembly, perform zero point calibration. Calibration

C -- CLEAN OR REPLACE SPEED SENSOR
B -- CLEAN OR REPLACE SPEED SENSOR
A -- REPLACE BRAKE ACTUATOR ASSEMBLY