Speed signal
| Speed signal |
| Wheel speed |
The speed signal is obtained from pin 7 of the ABS control module and applied to pin 9 of the MOTRONIC control module.
The signal is a square wave with a voltage which varies between 0 and 10 V and a frequency which varies with wheel speed.
Rotating the front RH wheel will suffice to check the signal.
Among other things, the signal is used for idling control up to 800 rpm when the speed of the car is 0 km/h.
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