A8 Sedan V8-3.7L (AEW) (1997)
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Check wiring for open circuit between power output stage and ignition coil connector terminal 1.
Power output stage
Ignition coil stage
4-pin connector terminal
3-pin connector terminal
Black connector
Cylinder
1
1
2
4
3
6
4
7
Brown connector
Cylinder
1
2
2
3
3
5
4
8
If wiring is OK:
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Check wiring for open or short circuit between ignition coil connector terminal 15 and fuse (E-box in plenum).
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Check voltage supply to fuse (open circuit).
If wiring is OK:
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Check ignition secondary circuit
NOTE:
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Measuring ignition coil primary resistance is usually not necessary with this test (primary resistance is approx. 0.3 - 0.5 Ohm, measured between
ignition coil terminals 1 and 15).
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A high-tension isolation diode is integrated in the ignition coil secondary circuit. It is therefore not possible to measure ignition coil secondary
resistance with conventional test equipment.