TIAGO

1.05L REVOTORQ ENGINE

156

iii. WHEEL SPEED SENSOR :



Component Details :

The Wheel speed sensor in vehicle is

connected to a voltage source for operation

(active sensor). It is used in conjunction with a

ferrous Toner wheel and supplies a signal with

constant amplitude pulses whose frequency

varies with the wheel speed. It uses Hall effect

principle, it has a semiconductor chip with the

electronic circuitry for supply and signal

processing integrated on it.

This chip is located within an almost

completely insulated magnetic circuit consisting of

permanent magnet and pole elements. The wheel

speed sensor is mounted directly above the non-

magnetized toner wheel. The magnetic toner

wheel is a ring with teeth on it. The toner wheel is

fitted on to the wheel hub. The alternating teeth

and gap that accompanies the wheel rotation

induces differential magnetic flux density, thus

leading to the variation in the voltage induced in

the semiconductor chip. The signal conditioning

circuit converts this voltage variation into constant

amplitude current pulses. The frequency of these

pulses depends up on the wheel speed. This

measurement principle permits zero speed

measurement.

Precise alignment and gap between the

stator pole and the Toner wheel is vital. To obtain

correct signal, the specified gap between the end

of sensor and the toner ring must be maintained.



Component Location :

Wheel Speed Sensor (Front) :

Wheel Speed Sensor (Rear) :

Connector Detail :

Pin Details :

Pin No

Description

Wheel Speed Sensor Signal

Wheel Speed Sensor Power

Precautions while handling wheel speed

sensor.

1. Storage temperature (-40

C to +50

C) should

not be exceeded.

2. Avoid free fall of the sensor.

3. The sensor tip should not be scratched.

4. Sensor should not be exposed to strong

magnetic field.