Wheel sensors, front
| Wheel sensors, front |
The control module receives wheel speed signals on pins 4 and 5 from the LH front wheel sensor.
The control module receives input signals on pins 20 and 21 from the RH front wheel sensor.
The sensor module consists of a toothed wheel with 29 teeth and an inductive sensor.
The inductive sensor works like a small alternator, the sine-wave voltage of which increases with increasing wheel speed. The sine-wave voltage alternates between negative and positive polarity, which is achieved by alternate teeth and gaps on the toothed wheel. The control module uses this polarity reversal as a pulse generator. The frequency of the pulses increases with wheel speed.
Using a multimeter set for a.c., it should be possible to obtain a voltage reading across the sensor's two leads of >100mV∼ if the wheel is rotated at a speed of 1 revolution per second.
A wheel speed of 20 km/h will produce about 5V∼. If the sensor does not work or if there is a break in the circuit, the ABS will be disconnected and the ABS (ANTI LOCK) warning lamp will light up.
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