Checking power supply 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

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Connect multimeter and measure voltage as follows.

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

Specification: approx. battery voltage

If reading does not match specification:

Perform following checks marked with a dot:

Fig 2: Location Of Secondary Air Injection (AIR) Pump Relay J299

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Check fuse S130 (40 A) in 3-way relay carrier of electronics box in plenum chamber, position 7.
Check for open circuit in wiring from battery+ (terminal 30) to fuse S130 to Secondary AIR pump relay J299 (in 3-way relay carrier of electronics box in plenum chamber, position 2).

→ Electrical Wiring Diagrams, Troubleshooting and Component Locations

Fig 3: Identifying Secondary Air Pump Relay Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect multimeter and measure voltage as follows.

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

Briefly operate starter.

Specification: approx. battery voltage

If reading does not match specification:

Perform following checks marked with a dot:

Fig 4: Identifying Main Fuse Box

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Check fuse S234 (in fuse box, position 34). → Electrical Wiring Diagrams, Troubleshooting and Component Locations
Check for open circuit in wiring from Secondary AIR pump relay J299- (in 3-way relay carrier of electronics box in plenum chamber) to fuel pump relay via fuse S234 (in fuse box, position 34): → Electrical Wiring Diagrams, Troubleshooting and Component Locations