Wheel Sensor 7/31, 7/32, 7/56, 7/57: Notes

Fig 1: Identifying Hall Sensor (Active Sensor)

Courtesy of VOLVO CARS CORPORATION

Type 

Hall sensor (active sensor).

characteristic 

When the toothed wheel rotates, a pulsed current signal (square wave) with fixed pulse ratio is generated. The frequency increases with speed.

Tooth at sensor 

• I≈ 14 mA

Cover at sensor 

• I ≈ 7 mA

Other information 

Nothing