A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
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Connect multimeter between terminal - 3 - and - 4 - of harness connector for voltage measurement.
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Switch ignition on.
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Specification: approx. battery voltage.
If specification is not obtained:
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Repair open circuit in wiring according to wiring diagram.
Check activation of Fuel Pump (FP) Control Module J538
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Remove protective cap.
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For voltage testing, connect the multimeter with measuring probes and connector adapters from the connector test set V.A.G 1594 C between
clamp - 4 - and - 5 - , as shown in illustration. The electrical connection remains connected.
NOTE: Connector sockets are numbered respectively on the rear side of the connector.
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Start engine.
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Specified value during start and while running at idle: approx. 5.0 V.
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Depress accelerator pedal completely and then release it (brief throttle burst).
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Specification: The voltage value must first rise slightly, then fall and then rise again to the previously read value.
If the reading does not result as described:
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Switch off ignition.
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Connect test box V.A.G 1598/42 to wiring harness with adapter cable V.A.G 1598/39-1 or adapter cable V.A.G 1598/39-2 ; engine control
module (ECM) remains connected. Clamp test box Ground (GND) clip to battery negative terminal.
CAUTION: To avoid damaging electronic components, set measuring range before connecting test leads and observe all test