A8L V8-4.2L (BFM) (2004)
Variable Induction Control Valve: Testing and Inspection
Intake Manifold Change-Over Valve - N156-, Checking
Intake Manifold Change-Over Valve -N156-, Checking
Checking Intake manifold change-over valve electrically
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Disconnect connector from Intake Manifold Change-Over Valve -N156-.
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Perform a resistance measurement between the valve terminals using V.A.G 1526.
Specified value: 25 to 35 Ohms
If specified value is not obtained.
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Replace Intake Manifold Change-Over Valve -N156-.
If specified value is obtained.
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Check voltage supply.
Checking voltage supply of Intake Manifold Change-Over Valve
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Connect V.A.G 1527 voltage test lamp between connector terminal 2 and engine Ground (GND) using adapter cables from V.A.G 1594 connector
test kit.
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Switch ignition on.
LED must light up.
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LED does not light up.
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Check fuse for intake manifold change-over valve (relay- and fuse holder in instrument panel, right side).
If fuse is OK.
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Check wire connection from terminal 2 of connector for intake manifold change-over valve via fuse to Motronic Engine Control Module (ECM)
Power Supply Relay -J271- (relay carrier in E-box in plenum chamber) for open circuit/short circuit.
If voltage supply is OK, check wire connection.
Checking wire connection from Intake Manifold Change-Over Valve
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Connect V.A.G 1598/31 test box to wiring harness of Engine Control Module (ECM).
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Check the following wire connection for open circuit/short circuit:
Connector at wiring
V.A.G 1598/31 test box or