EVAP Canister Purge Regulator Valve -N80-, Checking

Evaporative Emission (EVAP) Canister Purge Regulator Valve - N80, Checking

Checking for leaks
If there is no electrical signal (not activated) the solenoid valve remains closed.
- Disconnect hoses from Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.
- Start output Diagnostic Test Mode and select Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80. Refer to "Scan Tool Testing/Output Diagnostic Test Mode (DTM) (Function 03)" Testing and Inspection

Indicated on display


Output Diagnostic Test Mode ->
EVAP canister purge regulator valve -N80


The valve should click and should open and close (test by blowing into auxiliary hose).
- If valve does not click, carry out electrical test of Evaporative Emission (EVAP) Canister Purge Regulator Valve.
- If valve does not open and close properly, replace Evaporative Emission (EVAP) Canister Purge Regulator Valve.

Electrical testing of Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80
- Disconnect connector from Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.







- Measure resistance between contacts on valve using hand-held multimeter Fluke 83 (or equivalent).
Specification: 22-30 Ohms

If the specification is not obtained:
- Replace Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.

If the specification is obtained:
- Check voltage supply.

Checking voltage supply to Evaporative Emission (EVAP) Canister Purge
Regulator Valve (solenoid valve)


NOTE: The Evaporative Emission (EVAP) Canister Purge Regulator Valve receives its power supply via the fuel pump relay.


Test requirements
- Fuse for EVAP valve OK
- Disconnect harness connector on Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.







- Connect VAG1527 diode test lamp between engine Ground (GND) and socket 1 on connector.
- Operate starter.

The diode test lamp should light up. If diode test lamp does not light up:
- Check continuity of wiring from socket I to fuel pump relay via fuse. Repair open circuit if necessary.
- If wiring is OK, check fuel pump relay. Testing and Inspection

If the diode test lamp lights up, check activation.

Testing activation of Evaporative Emission (EVAP) Canister Purge Regulator Valve







- Connect VAG1527 between diode test lamp sockets 1 (B+) and 2 of harness connector.
- Start output Diagnostic Test Mode (DTM) and select Evaporative Emission (EVAP) Canister Purge Regulator Valves -N80. (To initiate DTM a second time, the engine must be started and switched off)

The diode test lamp should blink.

If the diode test lamp does not blink or lights up continuously:







- Connect VAG1598/31 test box to multi-pin harness connector for engine control module. Do not connect to the engine control module itself. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" Testing and Inspection

If the diode test lamp lights up continuously:







- Check for short circuit to Ground (GND) in wiring between contact 2 on EVAP valve harness connector and socket 64 on test box.

If the diode test lamp does not flash:
- Check for open circuit as well as short circuit to B+ in wiring between contact 2 on EVAP valve harness connector and socket 64 on test box.
Resistance in wiring: max. 1.5 Ohms
- If necessary, repair short circuit to Ground (GND) or open circuit.

If no short circuit or open circuit is found
- Replace Motronic Engine Control Module (ECM) -J220.