Audi AMB Service Manual page 236

ENGINE 1.8 Liter 4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AMB
Fig. 308: Identifying Secondary Air Injection (AIR) Solenoid Valve -N112-
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Disconnect connector from Recirculating valve for turbocharger N249- - 1 -.

Fig. 309: Connecting Multimeter To Valve (Resistance Measurement Range)
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Connect multimeter and measure resistance at valve.

Specification: 27... 30 ohms

If reading does not match specification:
Replace Recirculating valve for turbocharger N249.

If measured value matches specification:
Check power supply.

Checking power supply
NOTE:
The recirculating valve is supplied with power via the fuel pump relay.

2005 Audi A4 Quattro
1:01:19 AM Page 224