Checking actuation of secondary AIR pump relay

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.

Switch off ignition.
Disconnect secondary AIR pump relay.

Fig 1: Identifying Secondary Air Pump Relay Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect voltage tester VAG1527B as follows:

3-way relay carrier in electronics box in plenum chamber, position 2, contact	Measure to
6	Engine Ground

Start output Diagnostic Test Mode and actuate Secondary AIR pump relay J299.

LED must flash

If LED does not flash:

Switch off ignition.
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 Secondary Air Pump Relay Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

3-way relay carrier in electronics box in plenum chamber, position 2, contact	Test box VAG1598/31 ocket
6	66

If necessary, eliminate open circuit/short circuit.

If no fault is found:

Replace Secondary AIR pump relay J299.