Audi AMB Service Manual page 167

ENGINE 1.8 Liter 4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AMB
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Disconnect connector - arrow - at camshaft adjuster.

Fig. 229: Measuring Resistance Between Terminals Of Solenoid Valve
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Connect multimeter and measure resistance at valve.

Specification: 10...18 ohms

If reading does not match specification:
Replace valve.

If measured value matches specification:
Check power supply.

Checking power supply
Requirements
Fuse for camshaft adjustment valve OK --> Electrical Wiring Diagrams, Troubleshooting and Component

Locations
Fuel pump relay OK --> 24 - MULTIPORT FUEL INJECTION (MFI)

2005 Audi A4 Quattro
1:01:07 AM Page 155