S4 V8-4.2L (BHF) (2004)
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Connect Vehicle Diagnostic, Testing and Information System VAS 5051 A and select vehicle system "01 - engine electronics". Ignition must be
switched on.
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 Exhaust Flap Valve 1 -N321- is activated.
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LED must blink slowly
NOTE: Voltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little
and then get significantly brighter during activation.
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End function "03 - output Diagnostic Test Mode (DTM)" by pressing button.
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Select "06 - End Output".
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Switch ignition off.
If LED does not react as described:
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Connect test box V.A.G 1598/31 to wiring harness connectors, Engine Control Module (ECM) is not connected. Connect Ground (GND) clip at
test box to Ground (not visible in illustration). See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and
Clearing Diagnostic Trouble Codes/Scan Tool Connecting/Test Box, Connecting For Wiring and Component Test
CAUTION: To avoid damaging electronic components, set measuring range before connecting test leads and observe all test requirements.
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Check following wiring connection for open circuit: