C1402

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1401,C1402: Front Speed Sensor RH Malfunction


DESCRIPTION

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

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









HINT
- DTC C1401 is for the front speed sensor RH.
- DTC C1402 is for the front speed sensor LH.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FRONT SPEED SENSOR INSTALLATION

(a) Check the speed sensor installation.





OK:

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

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

2. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

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

ABS/VSC/TRAC





(d) Check 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 On-Vehicle Inspection.

OK:

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

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

HINT
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.

NG -- REPLACE FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR

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