S4 V8-4.2L (BHF) (2004)
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Connect voltage tester V.A.G 1527 B as follows:
Harness connector
Measure to
Terminal
-1 -
Engine Ground (GND)
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Operate starter briefly.
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LED must light up
If LED does not light up:
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Check wiring connection from harness connector terminal - 1 - to Fuel Pump (FP) Relay -J17- via fuse for open circuit according to wiring
diagram.
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Repair wiring connection if necessary.
If LED lights up:
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Check activation.
Checking activation
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Connect voltage tester V.A.G 1527 B between terminals - 1 - and - 2 -.
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Vehicle Diagnostic, Testing and Information System VAS 5051 A connected, "Vehicle Self-Diagnosis" "01 Engine electronics" selected. Ignition
must be switched on for this.
Display on VAS 5051 A:
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In selection - 1 -, click on function "03 - output Diagnostic Test Mode (DTM)".
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Press button repeatedly until Secondary Air Injection (AIR) Solenoid Valve -N112- is activated.