A4 Quattro Wagon V6-2.8L (AHA) (1998)
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Connect LED tester VAG1527 between engine ground and terminal 1 of connector (B+).
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Crank starter for several seconds (engine can start).
LED in voltage tester must light up.
If LED does not light up, conduct the following tests:
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Check fuse for valves for camshaft adjustment.
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Check wiring from terminal 1 on 2-pin connector to fuse for continuity per wiring diagram.
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Check fuel pump relay and signal to relay.See: Fuel Delivery and Air Induction/Fuel Pump/Fuel Pump Relay/Testing and Inspection
Checking signal to valves for camshaft adjustment
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Disconnect harness connector from valve.
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Connect LED tester VAG1527 between connector terminals 1 and 2.
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Check using output DTM and activate camshaft adjustment. Refer to "Scan Tool Testing/Output Diagnostic Test Mode (DTM) (Function 03)"
See: Testing and Inspection
LED must flash.
If LED does not flash or stays on continuously:
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Connect VAG1598/22 test box to Motronic ECM harness connector and proceed as follows: Refer to "Scan Tool Testing/Scan Tool Connecting
and Initial Checks/Connecting VAG 1598/22 Test Box" See: Testing and Inspection
If LED does not flash:
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Check wiring from terminal 2 of connector for valve to terminal 55 of ECM/test box for continuity and short circuit to B+.
If LED stays lit constantly: