RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
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Check electrical harness connection from terminal - 3 - via fuse to Motronic Engine Control Module (ECM) Power Supply Relay (J271) for open
circuit according to wiring diagram.
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Repair open circuit in wiring according to wiring diagram.
Checking output wiring
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Connect Voltage Tester (V.A.G 1527B) as follows:
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Initiate output Diagnostic Test Mode (DTM).
Display on (VAS 5051B):