Up to 08/2009

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1403,C1404: Rear Speed Sensor RH Malfunction


DESCRIPTION

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for ABS control.

Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change when the rotors turn.

Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU.









HINT
- DTC C1403 is for the rear speed sensor RH.
- DTC C1404 is for the rear speed sensor LH.
WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK REAR SPEED SENSOR INSTALLATION

(a) Check the speed sensor installation (for 2WD).





OK:

There is no clearance between the sensor and the rear axle carrier.

(b) Check the speed sensor installation (for AWD).

OK:

There is no clearance between the sensor and the rear axle carrier.

The installation bolt is tightened properly.

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

Result:





D -- INSTALL REAR SPEED SENSOR CORRECTLY (for AWD)

C -- INSTALL REAR SPEED SENSOR CORRECTLY (for 2WD) Installation

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

2. CHECK REAR SPEED SENSOR TIP

(a) Remove the rear 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 REAR SPEED SENSOR
OK -- Continue to next step.

3. CHECK REAR SPEED SENSOR ROTOR

(a) Remove the rear speed sensor rotor Removal.

(b) Check the speed sensor rotor.

OK:

No scratches, oil, or foreign matter on the rotor.

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

HINT
If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.

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

4. READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

(a) Install the rear speed sensor and the rear speed sensor rotor.

(b) Connect the Techstream to the DLC3.

(c) Start the engine.

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

ABS/VSC/TRAC





(e) Check that the speed value output from the speed sensor displayed on the Techstream.

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. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart Problem Symptoms Table.

OK:

The speed value output from the speed sensor displayed on the Techstream is the similar speed as indicated on the speedometer.

Result:





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

HINT
- The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.
- If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly with rear speed sensor Removal for 2WD).
- If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.
C -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting

B -- REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR
A -- Continue to next step.

5. REPLACE REAR SPEED SENSOR

(a) Turn the engine switch off.

(b) Replace the rear speed sensor Removal.

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

NEXT -- Continue to next step.

6. RECONFIRM DTC

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

(b) Start the engine.

(c) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

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

Result:





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

HINT
- If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.
- If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.
B -- REPLACE REAR SPEED SENSOR ROTOR

A -- END