C0210
BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE 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 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 sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the ABS control system. The front and rear rotors have 48 serrations, respectively.
When the rotors rotate, the magnetic field emitted by the permanent magnet in the speed sensor generates 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 C1273/73 and C1274/74 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1273/73 and C1274/74 are output only in the Test Mode.
HINT:
- DTC C0210/33 is for the right rear speed sensor.
- DTC C0215/34 is for the left rear speed sensor.
- The BRAKE warning light comes on when speed sensor malfunctions are detected in two or more wheels.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration Initialization.
PROCEDURE
1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)
(a) Using Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC Check For Intermittent Problems.
ABS / VSC / TRAC:
OK:
There are no momentary interruption.
HINT: Perform the above inspection before removing the sensor and connector.
NG -- CHECK WIRE HARNESS (SKID CONTROL ECU - REAR SPEED SENSOR)
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)
(a) Check the Data List for proper functioning of the rear speed sensor.
ABS / VSC / TRAC:
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.
3. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS
(a) Connect the oscilloscope to terminals RR+ and RR-, or RL+ and RL- of the skid control ECU.
(b) Drive the vehicle at approximately 30 km/h (19 mph), and check the signal waveform.
OK:
A waveform as shown should be output.
HINT:
- As the 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 deposited on it.
NG -- REPLACE SKID CONTROL ECU
OK -- REPLACE SKID CONTROL ECU
4. INSPECT REAR SPEED SENSOR
(a) Disconnect the rear speed sensor connector.
(b) Measure the resistance of the sensor.
Standard resistance:
NOTE: Check the speed sensor signal after the replacement Test Mode Procedure.
NG -- REPLACE REAR SPEED SENSOR
OK -- Continue to next step.
5. CHECK WIRE HARNESS (SKID CONTROL ECU - REAR SPEED SENSOR)
(a) Disconnect the S8 and S9 ECU connectors.
(b) Disconnect the A25 and A26 sensor connectors.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
for LH
for RH
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
6. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS
(a) Connect the oscilloscope to terminals RR+ and RR-, or RL+ and RL- of the skid control ECU.
(b) Drive the vehicle at approximately 30 km/h (19 mph), and check the signal waveform.
OK:
A waveform as shown should be output.
HINT:
- 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 deposited on it.
NG -- REPLACE SKID CONTROL ECU
OK -- REPLACE SKID CONTROL ECU
7. REPLACE SKID CONTROL ECU
(a) Check the sensor installation.
OK:
There is no clearance between the sensor and rear axle carrier.
NOTE: Check the speed sensor signal after the replacement Test Mode Procedure.
NG -- REPLACE REAR SPEED SENSOR
OK -- REPLACE SKID CONTROL ECU