ABS (Antilock Brake System)

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 C1332/38 - Right Rear Speed Sensor Circuit

DTC C1333/39 - Left Rear Speed Sensor Circuit

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. 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 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.

HINT: DTC Code C0210/33, C1332/38 are for the right rear speed sensor.

DTC Code C0215/34, C1333/39 are for the left rear speed sensor.

WIRING DIAGRAM

INSPECTION PROCEDURE

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 on 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 about 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 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 BRAKE ACTUATOR ASSEMBLY
3. INSPECT REAR SPEED SENSOR

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

LH:

RH:

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

NG -- REPLACE REAR SPEED 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 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

LH:

RH:

NG -- REPAIR OR REPLACE HARNESS AND 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 about 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 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 attach to it.

NG -- INSPECT REAR SPEED SENSOR INSTALLATION
OK -- REPLACE BRAKE 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 skid control sensor (Removal).
(b) Check the sensor tip.
OK:
No scratches or foreign matter on the sensor tip.

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

NG -- CLEAN OR REPAIR REAR SPEED SENSOR TIP
OK -- Continue to next step.
8. INSPECT SENSOR ROTOR

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

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

NG -- REPLACE SPEED SENSOR ROTOR
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY