C1403

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1403, C1273, C1274, 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 brake 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 field change and sends a pulse signal to the skid control ECU.

HINT
When the connectors between the speed sensor and skid control ECU are connected, the following waveform is output.









HINT
* DTCs C1403 and C1273 are for the rear speed sensor RH.
* DTCs C1404 and C1274 are for the rear speed sensor LH.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Do not remove the speed sensor from the rear axle hub and bearing assembly.

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.

PROCEDURE

1. CHECK REAR 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 rear axle hub.

Text in Illustration





NG -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Removal
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (RR/RL WHEEL SPEED)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Start the engine.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

ABS/VSC/TRAC





(f) 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 Operation Check.

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

NG -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (REAR SPEED SENSOR, SENSOR ROTOR) Removal

OK -- END