Vehicle Stability Control System
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 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)
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 sensor detects wheel speed and transmits the appropriate signals to the skid control ECU. These signals are used for control of the ABS system. Each of the front and rear rotors has 48 serrations.
When the rotors rotate, the magnetic field generated by the permanent magnet in the speed sensor induces 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 skid control ECU to detect the speed of each wheel.
DTCs C1273/73, C1274/74, C1277/77 and C1278/78 are output only in the test mode (SIGNAL CHECK).
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
NOTE: When replacing the ABS and TRACTION actuator assembly, perform zero point calibration (Programming and Relearning).
PROCEDURE
1. READ VALUE OF TECHSTREAM (REAR SPEED SENSOR)
(a) Connect Techstream to the DLC3.
(b) Start the engine.
(c) Select the Data List mode on Techstream.
ABS / VSC / TRAC:
(d) Check that there is no difference between the speed value output from the speed sensor displayed by Techstream and the speed value displayed on the speedometer when driving the vehicle.
OK:
There is almost no difference in the displayed speed value.
HINT: There is tolerance of ±10% 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+ - RR- or RL+ - 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 the figure should be output.
- As vehicle speed (wheel revolution speed) increases, a cycle 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 the speed sensor rotor's scratches, looseness or foreign matter attached to it.
NG -- INSPECT REAR SPEED SENSOR
OK -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY
3. INSPECT REAR SPEED SENSOR
(a) Disconnect the rear speed sensor connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH
RH
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH
RH
(d) Remove the seat cushion and seatback.
(e) Make sure that there is no looseness at the connector's locking part and connecting part.
(f) Disconnect the skid control sensor wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH
RH
(h) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH
RH
(i) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH
RH
NOTE: Check the speed sensor signal after replacement (Test Mode Procedure).
NG -- REPLACE REAR SPEED SENSOR OR SKID CONTROL SENSOR
OK -- 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 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH
RH
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH
RH
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS
(a) INSPECTION USING OSCILLOSCOPE
(1) Connect the oscilloscope to terminals RR+ - RR- or RL+ - 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 the figure should be output.
- As vehicle speed (wheel revolution speed) increases, a cycle 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 the speed sensor rotor's scratches, looseness or foreign matter attached to it.
NG -- INSPECT REAR SPEED SENSOR INSTALLATION
OK -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY
6. INSPECT REAR SPEED SENSOR INSTALLATION
(a) Check the sensor installation.
OK:
There is no clearance between the sensor and rear axle carrier.
NOTE: Check the speed sensor signal after replacement (Test Mode Procedure).
NG -- REPLACE REAR SPEED SENSOR
OK -- Continue to next step.
7. INSPECT REAR SPEED SENSOR TIP
(a) Remove the rear speed sensor (Removal).
(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 REAR SPEED SENSOR
OK -- Continue to next step.
8. INSPECT SPEED SENSOR ROTOR
(a) Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign matter on the rotor.
NOTE: Check the speed sensor signal after replacement (Test Mode Procedure).
NG -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (SPEED SENSOR ROTOR)
OK -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY