wiring diagram AUDI A8 1998 D2 / 1.G AEB Engine Ignition Coil System Checking

28-19

Wiring for primary coil and power
supply, checking


Required special tools and test equipment

VAG 1527B LED voltage tester
VW 1594 connector test kit
Wiring diagrams

Test conditions
Fuse for ignition coils OK

Checking

- Disconnect 4-pin harness connector from power
output stage.

- Switch ignition on.

Note: - Connect VAG 1527B LED voltage tester in turn between 4-pin
connector terminals 1, 2, 3 and 4, and engine ground.
LED must light up for all 4 terminals
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28-20
If the LED in the tester does not light up:

- Check wiring for open circuits between power output stage and
terminal 1 at each coil connector, according to table.

Specified value: max. 1.5

If the wiring is OK: - Ignition coil connector terminal identification
Black 4-pin connector terminal
number (power output stage) Ignition coil terminal 1 at
connector for cylinder number:
1 1
2 2
3 3
4 4
- Check wiring for open circuit between each coil terminal 15 and fuse
and power supply, according to wiring diagram.

Specified value: max. 1.5
Pa
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11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.FU02.28.2

28-21

Power output stage for ignition coils,
checking


Required special tools and test equipment

VAG 1598/22 test box
Multimeter US 1119 (Fluke 83 or equivalent)
VAG 1527B LED voltage tester
VW 1594 connector test kit
Wiring diagrams

Note:
To check power output stage, disconnect all
connectors for fuel injectors and then erase DTC
memory.
Pa
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11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.FU02.28.2

28-22

Checking signal for power output stage

- Disconnect 5-pin harness connector from power
output stage.

If the LED in the tester does not blink: - Connect VAG 1527B LED voltage tester in turn between 5-pin
connector terminals 1, 2, 4 and 5, and engine ground.
- Crank starter for a few seconds in each case.
LED must blink all 4 times
- Connect VAG 1598/22 test box to ECM harness connector Page 01
-
56
.

- Check wiring for open circuit between ECM/test box and 5-pin harness
connector, according to wiring diagram.

Connector terminal 1 to ECM/test box socket 70
Connector terminal 2 to ECM/test box socket 78
Connector terminal 4 to ECM/test box socket 77
Connector terminal 5 to ECM/test box socket 71
Specified value: max. 1.5
Pa
ge 9 of 11 Individual i
gnition coil s
ystem, checkin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.28.2