ABS (Antilock Brake System)
BRAKE CONTROL: ANTI-LOCK 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 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 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 C1273/73 to C1278/78 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1273/73 to C1278/78 are output only in the Test Mode.
HINT:
- DTC C0210/33 and C1238/38 are for the rear speed sensor RH.
- DTC C0215/34 and C1239/39 are for the rear speed sensor LH.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. READ VALUE USING TECHSTREAM (REAR 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 REAR 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 REAR SPEED SENSOR INSTALLATION
(a) Turn the ignition switch off.
(b) Check the speed sensor installation.
OK:
The installation nut is tightened properly.
There is no clearance between the sensor and the rear axle.
Torque
8.0 N*m (82 kgf*cm, 71 in.*lbf)
NOTE: Check the speed sensor signal after replacement .
NG -- INSTALL REAR SPEED SENSOR CORRECTLY
OK -- Continue to next step.
4. INSPECT SPEED SENSOR TIP
(a) Remove the rear 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 -- CLEAN OR REPLACE REAR SPEED SENSOR
OK -- Continue to next step.
5. INSPECT HARNESS AND CONNECTOR (BETWEEN REAR SPEED SENSOR AND SKID CONTROL SENSOR WIRE)
(a) Install the rear speed sensor.
(b) Disconnect the rear speed sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
RH:
LH:
NOTE: Check the speed sensor signal after replacement .
NG -- REPLACE REAR SPEED SENSOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND REAR SPEED SENSOR)
(a) Disconnect the skid control ECU connector.
(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 rear axle hub and bearing .
(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 REAR AXLE HUB AND BEARING ASSEMBLY
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY