With Generic Scan Tool

Evaporative Emission (EVAP) Canister Purge Regulator Valve N80, checking

Special tools, testers and auxiliary items required
- Multimeter
- Wiring diagram

Test requirements
- The Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 fuse OK.
- The ignition switched off.

Note: Voltage for the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 is supplied by the Engine Control Module (ECM) Power Supply Relay J271.

Test procedure
- Perform a preliminary check to verify the customers complaint.

Start diagnosis






- Remove the engine cover -arrows-.






- Disconnect the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical harness connector.

Checking internal resistance






- Using a Multimeter, check the resistance between terminals 1 and 2 of the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.

Specified value: 22.0 to 30.0 Ohms.

If the specified value was not obtained:

- Replace the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.

If the specification is obtained:

Checking voltage supply






- Using a Multimeter, check the electrical harness connector terminal 1 to 2 for voltage.

- Operate the starter briefly.

Specified value: battery voltage.

If the specified value was not obtained:

- Using a Multimeter, check the electrical harness connector terminal 1 to Ground (GND).






- Operate the starter briefly.

Specified value: battery voltage.

If the specified value was not obtained:

- Check the wiring connection from the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical harness connector terminal 1 to the Power Supply Relay (terminal 30, B+) J317 terminal 2/87 for resistance.

If the specified value was not obtained:

- Check the wiring for a short circuit to Battery positive (+) or an open circuit.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the wiring connection.

If the specified value was obtained:

Check Ground (GND) activation






- Using a Multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical harness connector to Battery positive (+) for voltage.






- Operate the starter briefly.

Specified value: battery voltage.

- Switch the ignition off.

If the specified value was not obtained:

If the manufacturers test box is being used. Perform the following step.

- Install the Test Box 80 Pin VAG1598/22. Connecting VAG 1598/22 Test Box

If the manufacturers test box is not being used. Perform the following step.

- Remove the Engine Control Module (ECM) J220.






- Using a Multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical connector terminal 2 to the Engine Control Module (ECM) J220 electrical connector terminals for an open circuit.




Engine Code AHA


Specified value: 1.5 Ohms

If the specification was not obtained:

- Check the wiring for a short circuit to Battery positive (+) or an open circuit.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the wiring connection.

If the specification was obtained:

- Erase the DTC memory. Diagnostic Mode 04: Reset/Delete Diagnostic Data

- Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. Audi Drive Cycle/Readiness Code

- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:

- Replace the Engine Control Module (ECM) J220.

- Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the mentioned sequence:

1. Check the DTC memory.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code.

End of diagnosis.