Checking actuation

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying 2-Pin Electrical Connector & Terminals

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Connect voltage tester VAG1527B to contact 1 (positive) and 2 of connector.
Start output Diagnostic Test Mode and actuate Secondary Air Injection (AIR) solenoid valve N112.

LED must flash

If LED does not flash or if it is permanently lit:

Connect test box VAG1598/31 to engine control module wiring harness. Engine control module must not be connected. → 24 - MULTIPORT FUEL INJECTION (MFI)

Fig 2: Identifying 2-Pin Electrical Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Check for open circuit and short to Ground/positive in following wiring connection:

Connector contact	Test box VAG1598/31 socket
2	9

If necessary, eliminate open circuit/short circuit.

If wiring is OK:

Replace engine control module.