Volkswagen Golf/Jetta 2 manual

Switch unit - testing
Ignition system - fully electronic type / Switch unit - testing


1 The switch unit is located in the left-hand side of the plenum chamber beneath a plastic cover. The ignition coil should be in good condition before making this test.

2 Depress the wire clip and pull the connector from the switch unit.

3 Connect a voltmeter between terminals 4 and 2 on the connector (see illustration) then switch on the ignition and check that battery voltage is available. Switch off the ignition.

4.3 Testing FEI switch unit
4.3 Testing FEI switch unit

4 Using an ohmmeter, check that there is continuity between terminal 1 on the connector and terminal 1 on the coil.

5 Refit the connector to the switch unit, then connect a voltmeter across the low tension terminals on the coil (see illustration).

4.5 Voltmeter connection across ignition coil LT terminals when testing FEI
4.5 Voltmeter connection across ignition coil LT terminals when testing FEI switch unit

6 Release the spring and pull the connector from the control unit, then switch on the ignition. Check that initially a reading of 2 volts is registered on the voltmeter, dropping to zero after one to two seconds. If this is not the case, renew the switch unit and also if necessary, the ignition coil.

7 Using a temporary length of wire, briefly earth terminal 12 on the connector. The voltage should rise to at least 2 volts. If this is not the case, renew the switch unit.


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