A6 Quattro Sedan V8-4.2L (BVJ) (2007)
Diesel Intake Air Shut-Off Valve: Testing and Inspection
Intake Flap Motor V157, Checking
Special tools, testers and auxiliary items required
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Multimeter.
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Wiring diagram.
Test requirements
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Fuse SA3 OK.
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The parking brake engaged.
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The battery voltage at least 12.5 V.
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The selector lever of automatic transmission in position "P" or "N".
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All electrical consumers switched off (radiator fan must NOT run during test).
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A/C switched off.
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The fuel tank at least 1/4 filled.
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The ignition switched off.
Procedure
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Remove the front engine cover - arrows -.
Checking voltage supply
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Disconnect the Intake Flap Motor V157 electrical harness connector - 5 -.
Crank the engine.
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Using a Multimeter, check the Intake Flap Motor V157 electrical harness connector terminal 1 to 3 for voltage.
Switch the ignition off.
Specified value: battery voltage.
If the specified value was not obtained:
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Check the electrical harness connector for damage, corrosion, lose or broken terminals.
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Check the wiring from the Intake Flap Motor V157 electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power
Supply Relay J271 socket 2/87 for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
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Check the wiring from the Intake Flap Motor V157 electrical harness connector terminal 3 to the to the Ground (GND) connection 1 in the engine
compartment for a short circuit to each other, Battery (+), or an open circuit.
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If necessary, repair the faulty wiring connection.