Front Speed Sensor RH Circuit - Vehicle Stability Control System (for ADVICS Made)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for ADVICS Made): C0200/31,C0205/32,C1271/71,C1272/72: Front Speed Sensor RH Circuit
C1272/72 - Low Output Signal of Front Speed Sensor LH (Test Mode DTC)

DESCRIPTION

The speed sensors detect wheel speed and transmit the signals to the ECU. These signals are used for control of the ABS control system. Each of the front and rear rotors have 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.

DTCs C1271/71 and C1272/72 can be cleared when the speed sensor sends a wheel speed signal or the Test Mode ends. DTCs C1271/71 and C1272/72 are output only in the Test Mode.

HINT
* DTC C0200/31 is for the front speed sensor RH.
* DTC C0205/32 is for the front speed sensor LH.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC Check For Intermittent Problems.

ABS / VSC / TRAC

Result:

HINT
Perform the above inspection before removing the sensor and connector.

C -- CHECK FRONT SPEED SENSOR INSTALLATION

B -- REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Start the engine.

(d) Select the Data List mode on the Techstream.

ABS / VSC / TRAC

(e) Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.

OK:

The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed.

NG -- CHECK FRONT SPEED SENSOR INSTALLATION
OK -- Continue to next step.

3. PERFORM TEST MODE (SIGNAL CHECK)

(a) Perform sensor check in the Test Mode procedure Test Mode Procedure.

OK:

All Test Mode DTCs are cleared.

NG -- CHECK FRONT SPEED SENSOR INSTALLATION
OK -- Continue to next step.

4. RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTC Vehicle Stability Control System (for ADVICS Made).

(c) Start the engine.

(d) Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds.

(e) Check if the same DTC is recorded Vehicle Stability Control System (for ADVICS Made).

Result:

HINT
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.

B -- INSPECT FRONT SPEED SENSOR

A -- USE SIMULATION METHOD TO CHECK

5. CHECK FRONT SPEED SENSOR INSTALLATION

(a) Turn the ignition switch off.

(b) Check the speed sensor installation.

OK:

There is no clearance between the sensor and the front steering knuckle.

The installation bolt is tightened properly.

Torque
8.0 N*m (82 kgf*cm, 71 in.*lbf)

NG -- INSTALL FRONT SPEED SENSOR CORRECTLY
OK -- Continue to next step.

6. CHECK FRONT SPEED SENSOR TIP

(a) Remove the front speed sensor Removal.

(b) Check the speed sensor tip.

OK:

No scratches or foreign matter on the sensor tip.

NOTICE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.

NG -- CLEAN OR REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.

7. INSPECT FRONT SPEED SENSOR

(a) Turn the ignition switch off.

(b) Install the front speed sensor.

(c) Disconnect the front speed sensor connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard resistance:

RH
LH

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

NG -- REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT 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.

9. CHECK SPEED SENSOR AND SPEED SENSOR ROTOR SERRATIONS

(a) Reconnect the front speed sensor connector.

(b) Connect the oscilloscope to the front speed sensor terminal of the skid control ECU.

(c) Check that a waveform is output when the tires are rotated.

OK:

The same waveform is output from all the 4 wheels and there is no noise or interference in the waveform.

HINT
* 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 speed sensor rotor's scratches, looseness or foreign matter attached to it.

NG -- REPLACE BRAKE ACTUATOR ASSEMBLY
OK -- Continue to next step.

10. RECONFIRM DTC

(a) Reconnect the skid control ECU connector.

(b) Clear the DTC Vehicle Stability Control System (for ADVICS Made).

(c) Start the engine.

(d) Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds.

(e) Check if the same DTC is recorded Vehicle Stability Control System (for ADVICS Made).

Result:

HINT
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.

B -- USE SIMULATION METHOD TO CHECK

A -- REPLACE BRAKE ACTUATOR ASSEMBLY

11. REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)

(a) Turn the ignition switch off.

(b) Repair or replace the harness or connector.

(c) Check for any momentary interruption between the skid control ECU and front speed sensor Check For Intermittent Problems.

(d) Check that there is no momentary interruption.

NEXT -- Continue to next step.

12. RECONFIRM DTC

(a) Clear the DTC Vehicle Stability Control System (for ADVICS Made).

(b) Start the engine.

(c) Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds.

(d) Check if the same DTC is recorded Vehicle Stability Control System (for ADVICS Made).

Result: