1999 AUDI A4 check oil

28-11

Power output stages for ignition coils,
checking


Note:

Power Output Stage -N122 (black connector)
activates the ignition coils for cylinder bank 1
(cylinders 1 to 3).
Power Output Stage 2 -N192 (brown connector)
activates the ignition coils for cylinder bank 2
(cylinders 4 to 6).

Checking activation of power output stages

- Disconnect harness connectors from all six fuel
injectors.

Note:
It is important to ensure that no fuel is injected
during the test as this would damage the catalytic
converter. The harness connectors on the fuel
injectors must therefore be disconnected.
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11/22/2002 htt
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28-54
Evaluation display group 014, display field 3 Display field:
3
Possible cause
Corrective action
greater 15

Spark plug faulty
Spark plug connector faulty
Ignition coil or power output stage faulty- Check spark plug and ignition cable with
connector
- Check ignition coil Page 28
-5 .
- Check power output stages Page 28
-11


Fuel injector faulty
Check compression of one or more cylinder
weak - Check fuel injectors Page 24
-39
- Check compression pressure
Pa
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.FU04.28.1

28-57
Evaluation display groups 015 and 016 Display field: 1,2 and 3 from measuring
value block 15 and 16
Possible cause
Corrective action
greater 15
Spark plug faultySpark plug connector faulty Ignition coil or power output stage
faulty - Check spark plug and ignition
cable with connector
- Check ignition coil Page 28
-5 .
- Check power output stages
Page 28
-11


Fuel injector faultyCheck compression of one or
more cylinder weak - Check fuel injectors Page 24
-39
- Check compression pressure
Pa
ge 64 of 64 I
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.28.1