Audi Workshop Service and Repair Manuals

• ‒ Remove connector from changeover valve => installation positions overview, Page 23-7
• ‒ Connect multimeter to valve to measure the resistance.

• Specified value: 30...40 ω

If specified value is not attained:

• ‒ Replace the changeover valve.

If specified value is attained:

• ‒ → Connect the handheld multimeter (voltage range) between earth and contact 1 on the connector.
• ‒ Switch the ignition on.

• Specified value: approx. battery voltage

If specified value is not attained:

• ‒ Connect test box V.A.G 1598/22 to wiring harness for engine control unit =>Page 23-39.

The following wiring connections are to be checked for open circuits and/or short to positive or negative.

• ‒ Rectify any open/short circuit as necessary.