AUDI A8 1995 D2 / 1.G AHA Engine Motronic Ignition System Owner's Guide
Page 31 of 34
28-25
Checking signal for power output stage
- Remove connectors from all 6 injectors (DTC
memory will have to be checked and erased
later).
- Switch ignition on.
If LED flashes: - Connect LED tester VAG1527 between engine ground and connector
terminal 3.
- Crank starter for several seconds.
LED in voltage tester must flash.
- Repeat test on 5-pin connector terminals 4 and 5.
- Replace ignition coils -N-, -N128- and -N158- with power output stage -
N122-.
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Page 32 of 34
28-26
If LED does not flash:
- Connect VAG1598/22 test box to ECM harness
connector page 01
-67
.
If wiring is OK: - Check wiring between ECM/test box and 5-pin connector for continuity
and/or short circuit per wiring diagram.
Connector terminal 3 to ECM/test box socket 71
Connector terminal 4 to ECM/test box socket 78
Connector terminal 5 to ECM/test box socket 70
- Replace Motronic ECM -J220- page 01
-68
.
- Carry out adaptation of throttle valve control module to ECM page
24
-150
.
- Check readiness code page 01
-70
.
If Diagnostic Trouble Code (DTC) memory has been erased, or ECM
has been disconnected, generate new readiness code page 01
-73
.
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Page 33 of 34
28-27
Checking ground for power output stage
- Disconnect 5-pin connector from ignition coils.
If LED does not light up:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder - Connect VAG1527 LED voltage tester between B+ and terminal 2
(ground) of connector.
LED in tester must light up.
- Check wires for open circuit per wiring diagram.
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Page 34 of 34
28-28
Checking voltage supply of ignition coils
Test requirement
Fuse for ignition coils OK
- Disconnect 5-pin connector from ignition coils.
- Switch ignition on.
If LED does not light up:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder - Connect VAG1527 LED voltage tester between engine ground and
terminal 1 (B+) of connector.
LED in tester must light up.
- Check wires for open circuit per wiring diagram.
- Check fuse for ignition coils.
Pa
ge 34 of 34 Motronic i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.1