S4 V8-4.2L (BHF) (2004)
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Briefly operate starter.
^
LED must light
If LED does not light:
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Use wiring diagram to check for open circuit in wiring from contact 1 of connector via fuse to fuel pump relay.
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Use wiring diagram to eliminate open circuit in wiring.
If LED lights:
Checking actuation
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Connect voltage tester V.A.G 1527 B between contacts 1 and 2.
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Vehicle diagnostic, testing and information system VAS 5051 connected; vehicle self-diagnosis and vehicle system "01.Engine electronics"
selected. Ignition must be on.
Indicated on VAS 5051:
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From list -1- select diagnostic function "03. Final control diagnosis".
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Keep touching - key until Secondary AIR solenoid valve -N112- is actuated.
^
LED must flash
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Terminate function "0.3 - Final control diagnosis" by touching - key.
If LED does not flash or if it is permanently lit:
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Connect test box V.A.G 1598/31 to wiring harness connectors. Actual engine control module is not to be connected. Connect Ground clip of test
box to Ground (not shown in Fig.).
CAUTION: Always observe the test conditions and select the required measuring range before connecting test leads to prevent damaging
electronic components.