A6 Sedan V6-2.8L (AHA) (1998)
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Connect multimeter US 1119 (Fluke 83 or equivalent) and check resistance across valve terminals.
Specified value: 22-30 Ohms
If resistance is NOT OK:
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Replace EVAP canister purge regulator valve.
Checking EVAP canister purge regulator valve voltage supply
Test conditions
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Fuse for EVAP canister purge regulator valve OK
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Disconnect harness connector from EVAP canister purge regulator valve.
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Connect VAG 1527B LED voltage tester between connector terminal 1 (B+) and engine Ground.
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Operate starter motor.
Specified value: LED must light up
If LED test light does not light:
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Check wiring for open circuit between connector terminal 1 and fuse, according to wiring diagram; repair if necessary.
Specified value: 1.0 Ohms max.
If wiring is OK:
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Check fuel pump relay. Refer to See: Fuel Delivery and Air Induction/Fuel Pump/Fuel Pump Relay/Testing and Inspection
Checking signal to EVAP canister purge regulator valve