S4 V8-4.2L (BHF) (2004)
Checking internal resistance
-
Connect multimeter to valve to Exhaust Flap Valve 1 -N321- for resistance measurement.
-
Specified value: 22 to 30.
If specified value is not obtained:
-
Replace Exhaust Flap Valve 1 -N321-.
If specified value is obtained:
-
Check voltage supply.
Checking voltage supply
-
Connect multimeter to terminal - 1 - and Ground (GND) for voltage measurement.
-
Start engine.
-
Specified value: Approx. battery voltage
If specified value is not obtained:
-
Check wiring connection of harness connector terminal 1 for open circuit according to wiring diagram. Repair wiring connection if necessary.
If specified value is obtained:
-
Check activation.
Checking activation
-
Connect voltage tester V.A.G 1527 B between terminals - 1 - and - 2 -.