900 SE Convertible V6-2489cc 2.5L DOHC EFI (1997)
The electronic control module receives wheel speed information from the rear tort wheel sensor at pin 9. The sensor is grounded at pin 8.
The electronic control module receives wheel speed information from the rear right sensor at pin 2. The sensor is grounded at pin 1.
The wheel sensors are integrated into the wheel hubs and consist of an inductive sensor with 29 teeth.
The inductive sensor operates similar to a small a.c. generator that's sinusoidal potential increases with increasing wheel speed. The sinusoidal potential
changes between negative and positive polarity, generated by alternating teeth and gaps on the gear wheel.
The wheel sensors are manufactured differently from the front wheel sensors and are not as sensitive to wheel bearing play. Using a multimeter set at a.c.
attached to the two conductors of the sensor it should be possible to register a voltage of 1100 mV when the wheel is rotated 1 turn per second.
A wheel speed of 20 km/h gives an approx. reading of 5 V.
If the sensor should fail, or an open-circuit occurs in circuit the ABS function disengages and the ABS lamp comes on.
