S4 V8-4.2L (BHF) (2004)
If LED does not light up:
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Check electrical harness connection from terminal - 3 - via fuse to Fuel Pump (FP) Relay J17 for open circuit according to wiring diagram.
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Repair open circuit in wiring according to wiring diagram.
Checking output wire
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Connect voltage tester V.A.G 1527 B as follows:
Harness connector Terminal
Measure to
- 2 -
Battery positive (B+)
-
initiate output Diagnostic Test Mode (DTM)
Display on VAS 5051 A:
A. Output diagnostic test mode waiting, Advancing by switching required
1. Evaporative Emission (EVAP) Canister Purge Regulator Valve N80
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Press -> button repeatedly until leak detection pump for fuel system is activated
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LED must blink.
If LED does not blink:
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End function "03. output Diagnostic Test Mode (DTM)" by pressing button.
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From selection, click on the diagnostic function "06. End output".
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Switch off ignition.