Note: Audi recommends using the VAG 1315 A digital multimeter or the VAG 1526 multimeter for the most accurate readings in the following tests as the internal resistance of some ohmmeters can affect the results.
Ignition coil
1. Disconnect wiring and cover from ignition coil (photo). If necessary, mark the location of each wire.
2. Connect the instrument between terminals 1 (-) and 15 (+), the resistance of the primary winding must comply with the data in the Specifications.
3. Connect the instrument between terminals 4 (NT) and 15 (+), the resistance of the rotor windings must comply with the data in the Specifications.
4. Connect the wiring.
Switch block
5. Check the ignition coil as described in steps 1-4.
6. From inside the car, remove the footwell trim on the left or right (according to the model) (photo).
7. Squeeze the spring clip together and pull out the connector (photo).
8. Connect a voltmeter between terminals 2 and 4 (Pic. 4.3).
9. Turn on the ignition and check that the voltmeter registers the battery voltage. If not, check the wiring.
10. Switch off the ignition, then disconnect the voltmeter and reconnect the connector.
11. Squeeze the spring clip together and disconnect the wiring from the distributor.
12. Connect a voltmeter to terminals 1 (-) and 15 (+) on the ignition coil.
13. Turn on the ignition, at first the voltage should be about 2 volts, then it will drop to zero within one or two seconds. If not, replace the switch block. Also check if the sealant has leaked from the ignition coil. If necessary, replace the ignition coil.
14. Connect the center terminal of the distributor wire terminal to ground. The voltage should briefly rise to 2 volts. If not, check the center wire of the clamp or replace the switch.
15. Turn off the ignition.
16. Connect a voltmeter to the outer terminals of the distributor wire contact.
17. Turn on the ignition, the voltmeter should show at least 5 volts.
18. Disconnect the voltmeter and reconnect the wire contact to the distributor.
19. If damage is still not detected, check the wiring between the distributor and the block switch and if the wiring is not damaged, replace the switch.
20. Disconnect the voltmeter and connect the connector. Install the trim on the left or right side of the footwell.
Distributor hall sensor
21. Before testing the Hall sensor, check the switch block and ignition coil as described earlier and make sure the associated wiring is in good condition.
22. Disconnect the high voltage wire from the cover of the breaker-distributor and connect it to a suitable earth point using a suitable length of wire.
23. From within the car remove furnish at the left or on the right in a compartment for legs.
24. Connect a voltmeter between terminals 3 and 6 on the switch block, leaving the connector connected to the switch.
25. Turn on the ignition.
26. Using a wrench on the crankshaft pulley bolt, turn the engine slowly clockwise while observing the voltmeter reading. The voltage should alternate from zero to 2 volts. If not, replace the Hall sensor.
27. Turn off the ignition, disconnect the voltmeter, install the trim and connect the high voltage wires.
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