AUDI A4 1999 B5 / 1.G AEB Engine Ignition Coil System Checking

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.
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