audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Ignition System > < Variable Induction Control Valve|Testing and Inspection|Page 3941
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Operate starter briefly.
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LED should illuminate.

If the LED does not illuminate:

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Check wiring from terminal 1 on connector via fuse to fuel pump relay for an open circuit.

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Repair open circuit if necessary.

If LED lights up:

Checking actuation

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Connect voltage tester VAG1527 B between terminals 1 and 2.

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Initiate final control diagnosis and activate intake manifold change-over valve.
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LED should flash.

If the LED lamp does not flash or if it illuminates continuously:

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Connect test box VAG1598/31 to wiring harness for engine control module; engine control module must not be connected.

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Check for open circuit and short to positive or Ground in following wiring connections:

Connector

Test box VAG1598/31

terminal

Socket

2

48

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Repair any open/short circuit as necessary.

If no wiring malfunction is detected:

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Replace engine control module.

Ignition System > < Variable Induction Control Valve|Testing and Inspection|Page 3941