Audi A8 1994 Service Manual page 103

Motronic injection and ignition system (6-cylinder) - Edition 02.1999
Testing earth connection to output stage
- -> Connect diode test lamp V.A.G 1527 between battery positive terminal and contact 2 (earth) on the
connector.
Specification: The diode test lamp should light up.
- If the diode test lamp does not light up, test wiring using current flow diagram and rectify any open circuits.
=> Current flow diagrams, Electrical fault-finding and Fitting locations
Testing power supply to ignition coils
Test requirement:
• Fuse for ignition coils OK
- -> Connect diode test lamp V.A.G 1527 between engine earth and contact 1 (positive) on the connector.
- Operate starter for a few seconds.
Specification: The diode test lamp should light up.
Note:
The supply voltage for the ignition coils is taken from the fuel pump relay.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
- If specified results are not obtained, test for open circuit using current flow diagram. Rectify any open circuits
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
and test the fuse.
with respect to the correctness of information in this document. Copyright by AUDI AG.
=> Current flow diagrams, Electrical fault-finding and Fitting locations
Testing activation
- Unplug connectors from all six injectors (interrogate fault memory after testing).
Audi A8 1994 ➤
1.6 - Testing ignition coils
99