C1403

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

Speed sensor rotors have rows of alternating N and S magnetic poles. The hall IC type speed sensor uses the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect vehicle speeds even when the vehicle is nearly stationary.









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.





OK:

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

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

2. READ VALUE USING TECHSTREAM (REAR 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

ABS/VSC/TRAC:

(d) 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. 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 same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

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.
* 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 REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR

OK -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System