Wheel sensors, rear
| Wheel sensors, rear |
The control module receives wheel speed information on pins 9 and 10 from the LH rear wheel sensor.
The control module receives wheel speed information on pins 6 and 18 from the RH rear wheel sensor.
The wheel sensors are integrated into the wheel hubs and consist of an inductive sensor with 29 teeth.
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 rear wheel sensor is of different design to the front wheel sensors and is not as sensitive to wheel bearing play. It starts to supply the control module with information at extremely slow wheel speeds.
Using a multimeter set for a.c., it should be possible to obtain a voltage reading across the sensor's two leads of >100 mV 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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