A4 Mk1
Testing ignition system
Testing dual-spark ignition system (2 coils)
Note: Each ignition coil is combined with its output stage as a single component. It is not possible to test this component using conventional measuring equipment and methods. If there is a fault in the ignition system:
If the tests do not reveal any faults but there is still no ignition spark:
Testing power supply |
If the specification is not obtained:
=> Current flow diagrams, Electrical fault finding and Fitting locations binder Testing activation of output stages
Note: It is important to ensure that no fuel is injected during the test as this would damage the catalytic converter. The connectors on the injectors must therefore be unplugged.
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If the specifications are not obtained:
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Check the following wiring connections for open circuits and short to positive or earth.
=> Current flow diagrams, Electrical fault finding and Fitting locations binder |