Exhaust Flap Valve 1 -N321-, Checking

Exhaust Flap Valve 1 -N321-, checking







Special tools, testers and auxiliary items required
- Multimeter V.A.G 1526 B or V.A.G 1526 A
- Voltage tester V.A.G 1527 B
- Connector test kit V.A.G 1594 C or V.A.G 1594 A
- Test box 1598/31
- Vehicle Diagnostic, Testing and Information System VAS 5051 A with diagnostic cable VAS 5051/1







Work sequence
- Remove left side trim in luggage compartment
- Disconnect electrical harness connector - arrow - from Exhaust Flap Valve 1 -N321-.
- Check internal resistance.







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 -.
- Connect Vehicle Diagnostic, Testing and Information System VAS 5051 A and select vehicle system "01 - engine electronics". Ignition must be switched on.







Display on VAS 5051 A:
- In selection - 1 -, click on function "03 - output Diagnostic Test Mode (DTM)".
- Press button repeatedly until Exhaust Flap Valve 1 -N321- is activated.

- LED must blink slowly

NOTE: Voltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little and then get significantly brighter during activation.

- End function "03 - output Diagnostic Test Mode (DTM)" by pressing button.
- Select "06 - End Output".
- Switch ignition off.

If LED does not react as described:







- Connect test box V.A.G 1598/31 to wiring harness connectors, Engine Control Module (ECM) is not connected. Connect Ground (GND) clip at test box to Ground (not visible in illustration). Test Box, Connecting For Wiring and Component Test

CAUTION: To avoid damaging electronic components, set measuring range before connecting test leads and observe all test requirements.







- Check following wiring connection for open circuit:

Harness connector Test box V.A.G 1598/31Socket
Terminal
-2- 22

- Repair wiring connection if necessary.