C0200

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C0200/31,C0205/32,C1271/71,C1272/72: Front Speed Sensor RH Circuit

DESCRIPTION

The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the brake control system. This speed sensor contains a sensor IC, which consists of 2 MREs (Magnetic Resistance Element). The speed sensor rotor, which consists of 48 sets of N and S poles that are arranged in a circle, is integrated with the inner race of the hub bearing.

To detect the rotation direction, the output signals from the speed sensor are used to determine the relationship of the pulses that are generated by the 2 MREs. Upon receiving the speed sensor signal, the sensor IC outputs a forward or backward signal to the ECU.

DTCs C1271/71 and C1272/72 are cleared when the speed sensor sends a vehicle speed signal or test mode ends. DTCs C1271/71 and C1272/72 are output only in 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 skid control ECU, perform initialization of linear solenoid valve and calibration Calibration.

HINT
Start the inspection from "CHECK HARNESS AND CONNECTOR" when using the Techstream and start from "PERFORM TEST MODE" when not using the Techstream.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruptions 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.

D -- CHECK FRONT SPEED SENSOR INSTALLATION

C -- CHECK FRONT SPEED SENSOR INSTALLATION

B -- READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)
A -- Continue to next step.

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

(a) Turn the engine switch off.

(b) Repair or replace the harness or connector.

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

NEXT -- Continue to next step.

3. RECONFIRM DTC

(a) Turn the engine switch off.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Start the engine.

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

(e) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

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 -- END
A -- Continue to next step.

4. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Start the engine.

(d) Select the Data List mode on the Techstream Data List / Active Test.

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.

HINT
Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. The margin of error can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart Operation Check.

OK:

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

ABS/VSC/TRAC

(f) Check that the sensor signal conforms to the wheel rotation direction.

OK:

The correct wheel rotation direction is displayed.

Result

C -- CHECK FRONT SPEED SENSOR INSTALLATION

B -- CHECK FRONT SPEED SENSOR INSTALLATION
A -- Continue to next step.

5. PERFORM TEST MODE (SIGNAL CHECK)

(a) Turn the engine switch off.

(b) Perform the sensor check in test mode Test Mode Procedure.

OK:

All test mode DTCs are cleared.

Result

C -- CHECK FRONT SPEED SENSOR INSTALLATION

B -- CHECK FRONT SPEED SENSOR INSTALLATION
A -- Continue to next step.

6. RECONFIRM DTC

(a) Turn the engine switch off.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Start the engine.

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

(e) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

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.

C -- REPLACE FRONT SPEED SENSOR

B -- REPLACE FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR

A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting

7. CHECK FRONT SPEED SENSOR INSTALLATION

(a) Turn the engine switch off.

(b) Check the speed sensor installation.

OK:

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

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

NG -- REPLACE FRONT AXLE HUB SUB-ASSEMBLY
OK -- Continue to next step.

8. CHECK SKID CONTROL SENSOR WIRE

(a) Check that there is no looseness at the locking part and the connecting part of the connectors.

(b) Disconnect the skid control sensor wire.

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

Standard resistance:

for RH
for LH

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

NG -- REPLACE SKID CONTROL SENSOR WIRE
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)

(a) Disconnect the A19 and A21 ECU connectors.

(b) Disconnect the A55 sensor connector.

(c) Disconnect the A73 sensor connector.

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

Standard resistance:

for RH
for LH

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

10. INSPECT SKID CONTROL ECU (SENSOR INPUT)

(a) Reconnect the A19 and A21 ECU connectors.

(b) Disconnect the A55 sensor connector.

(c) Disconnect the A73 sensor connector.

(d) Turn the engine switch on (IG).

(e) Measure the voltage according to the value(s) in the table below.

Standard voltage:

NG -- REPLACE SKID CONTROL ECU Removal
OK -- Continue to next step.

11. RECONFIRM DTC

(a) Turn the engine switch off.

(b) Reconnect the front speed sensor connector.

(c) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(d) Start the engine.

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

(f) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

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 -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting
A -- Continue to next step.

12. REPLACE FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR

(a) Turn the engine switch off.

(b) Replace the front axle hub sub-assembly (front speed sensor rotor and front speed sensor) Removal.

HINT
The front speed sensor rotor and front speed sensor are built into the front axle hub sub-assembly. If the front speed sensor rotor and front speed sensor needs to be replaced, replace the front axle hub sub-assembly.

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

NEXT -- Continue to next step.

13. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Start the engine.

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

(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

HINT
Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result

(b) Check the speed sensor installation.

OK:

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

The installation nut is tightened properly.

Torque:

8.5 N*m (87 kgf*cm, 75 in.*lbf)

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

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

15. CHECK FRONT SPEED SENSOR TIP

(a) Remove the front speed sensor Removal.

(b) Check the speed sensor tip.

OK:

No scratches, oil, 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.

16. CHECK SKID CONTROL SENSOR WIRE

(a) Check that there is no looseness at the locking part and the connecting part of the connectors.

(b) Disconnect the skid control sensor wire.

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

Standard resistance:

for RH
for LH

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

NG -- REPLACE SKID CONTROL SENSOR WIRE
OK -- Continue to next step.

17. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)

(a) Disconnect the A19 and A21 ECU connectors.

(b) Disconnect the A55 sensor connector.

(c) Disconnect the A73 sensor connector.

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

Standard resistance:

for RH
for LH

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

18. INSPECT SKID CONTROL ECU (SENSOR INPUT)

(a) Reconnect the A19 and A21 ECU connectors.

NG -- REPLACE SKID CONTROL ECU Removal
OK -- Continue to next step.

19. RECONFIRM DTC

(a) Turn the engine switch off.

(b) Reconnect the front speed sensor connector.

(c) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(d) Start the engine.

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

(f) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

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 -- END
A -- Continue to next step.

22. REPLACE FRONT SPEED SENSOR ROTOR

(a) Turn the engine switch off.

(b) Replace the front axle hub sub-assembly (front speed sensor rotor) Removal.

HINT
The front speed sensor rotor is built into the front axle hub sub-assembly. If the front speed sensor rotor needs to be replaced, replace the front axle hub sub-assembly.

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

NEXT -- Continue to next step.

23. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Start the engine.

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

(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result