Audi Workshop Service and Repair Manuals

• ‒ Switch ignition off.
• ‒ → Remove connector from valve => installation positions overview, page 23-3 Item 5.
• ‒ Connect multimeter to valve to measure resistance.

Engine code AGR

• Specified value: 25...45 ω

Engine codes ALH and AHF

• ‒ → Remove connector from valve => installation positions overview, page 23-7 Item 6.

• Specified value: 14...20 ω

If specified value is not attained:

• ‒ Renew the solenoid valve for boost pressure limitation (N75).

• ‒ → Connect hand-held multimeter between earth and contact 1 on the connector in order to measure the voltage.
• ‒ Switch the ignition on.

• Specified value: approx. battery voltage

If specified value is not attained:

• ‒ Switch ignition off.
• ‒ 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.