The test is carried out under the assumption that the ignition coil is defective.
Remove the plug from the final stage.
Connect a voltmeter to the black / yellow and brown wires on the plug, turn on the ignition.
The voltage supply to the final stage is OK if the voltage is about 12 V, otherwise you need to look for a wire break.
With the ignition off, connect the diode voltage probe with probes to the plug with the contact of the brown and green wires.
When cranking the engine, the LED should flash, otherwise there is no signal from the Hall sensor.
Switch off the ignition, connect the plug to the final stage.
Remove the plug to the Hall sensor on the distributor.
Connect a voltmeter to the ignition coil between terminals 1/- and 15/+.
Turn on the ignition
On the three-prong plug that has been removed so far, connect the middle contact with a wire to ground for a while. Observe the voltmeter: the voltage drops to 2 V for a short time.
After that, the voltage drops back to zero.
If the voltage drops again, then the control unit or the final stage is faulty.
If the filling compound protrudes, the ignition coil must also be replaced.
For engines with four valves per cylinder and KE-Motronic next to the ignition coil (3) there is a terminal stage (2), from which the plug is removed here (1).
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