Volkswagen Golf/Jetta 2 manual

Switch unit - testing
Ignition system - transistorised type / Switch unit - testing


1 When making this test, the coil must be in good condition.

2 Remove the plastic cover on the right-hand side of the plenum chamber for access to the switch unit (see illustrations).

4.2a Carefully prise free plastic cover . . .
4.2a Carefully prise free plastic cover . . .

4.2b . . . for access to ignition switch
4.2b . . . for access to ignition switch

3 Disconnect the multi-plug from the switch unit and connect a voltmeter between terminals 4 and 2 (see illustration).

4.3 Voltmeter connection when testing ignition switch unit
4.3 Voltmeter connection when testing ignition switch unit

4 Switch on the ignition and check that battery voltage, or slightly less, is available. If not, there is an open-circuit in the supply wires.

5 Switch off the ignition and reconnect the multi-plug to the switch unit.

6 Pull the multi-plug from the Hall sender on the side of the distributor (see illustration), then connect a voltmeter across the low tension terminals on the coil (see illustration).

4.6a Multi-plug connection to Hall sender on side of distributor
4.6a Multi-plug connection to Hall sender on side of distributor

4.6b Voltmeter connection to coil when testing ignition switch unit and coil
4.6b Voltmeter connection to coil when testing ignition switch unit and coil

7 Switch on the ignition and check that there is initially 2 volts, dropping to zero after 1 to 2 seconds. If this is not the case, renew the switch unit and coil.

8 Using a length of wire, earth the centre terminal of the distributor multi-plug briefly.

The voltage should rise to at least 2 volts. If not, there is an open-circuit or the switch unit is faulty.

9 Switch off the ignition and connect the voltmeter across the outer terminals of the distributor multi-plug.

10 Switch on the ignition and check that 5 volts is registered on the voltmeter.

11 If a fault still exists, renew the switch unit.

12 Switch off the ignition, remove the voltmeter and reconnect the distributor multi-plug.


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