Checking power supply for secondary AIR pump motor

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: Noise Insulation Tray Retainers

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Remove sound insulation - arrows -.

Fig 2: Disconnecting Connector From Secondary AIR Pump Motor V101

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Disconnect connector from Secondary AIR pump motor V101 - arrow -.

Location: right front in engine compartment below air cleaner housing

Fig 3: Identifying 2-Pin Electrical Harness Connector & Terminals

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Connect voltage tester VAG1527B between contacts 1 and 2.
Start output Diagnostic Test Mode and actuate Secondary AIR pump relay J299.

LED must flash

If LED does not flash:

Perform following checks marked with a dot:

Check for open circuit in wiring from contact 1 of connector to secondary AIR pump relay J299 (in 3-way relay carrier in electronics box of plenum chamber, position 2). → Electrical Wiring Diagrams, Troubleshooting and Component Locations
Check for open circuit in wiring from contact 2 of connector to Ground: → Electrical Wiring Diagrams, Troubleshooting and Component Locations

If no fault is found:

Replace Secondary Air Injection (AIR) pump motor V101.