light AUDI A4 1999 B5 / 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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gnition coil s
ystem, checkin
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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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e=re
pair&id=AUDI.B5.FU02.28.2

28-24

Checking power output stage

Signals to power output stage OK Page 28
-22
.

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

- Connect VAG 1527B LED voltage tester
between Battery Positive Voltage (B+) and, in
turn, each terminal of power output stage 4-pin
connector.

- Crank starter for a few seconds in each case.

LED must blink all 4 times
If the LED in the tester does not blink for all
terminals:

- Replace power output stage.

Note:
LED testers with very little power consumption
glow slightly before cranking the engine. During
cranking they will get brighter or darker.
Pa
ge 11 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