Wheel sensors, front
| Wheel sensors, front |
The electronic control module receives wheel speed information from the forward left wheel sensor at pin 7. The sensor is grounded via pin 6.
The electronic control module receives wheel speed information from the front right wheel sensor at pin 5. The sensor is grounded at pin 3.
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 AC, 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 gives approx. 5V∼. If the sensor fails or an open circuit occurs in the circuit the ABS function ceases and the ABS indicator lamp comes on.
The distance between the sensor and the toothed wheel should be 0.6±0.3 mm. The distance is non-adjustable.
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