Checking the Hall sensor (Audi 100 C3)

The Hall sensor is checked with a working ignition coil and switch and an ambient temperature from 0 to +40°C.

Execution order

1. Disconnect the central high-voltage wire from the ignition distributor and short it to ground.



2. Pull the rubber boot (1) off the junction block (2) and connect the voltmeter to contacts "6" and "3" (3 – switch).

3. Turn on the ignition and, slowly turning the crankshaft, observe the voltmeter readings. They should fluctuate from zero to 2 V (minimum value).

4. If the voltmeter readings do not change when the crankshaft rotates, then the Hall sensor is faulty and the ignition distributor needs to be replaced.