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

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







Special tools and workshop equipment required
- V.A.G 1526 A Multimeter
- V.A.G 1527 B LED voltage tester
- V.A.G 1594 A Connector test kit
- V.A.G 1598/31 Text box
- VAS 5051 Vehicle diagnostic, testing and information system
- VAS 5051/1 Adapter

Checking for leaks
Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- remains closed when de-energized.
- Disconnect hoses from EVAP Canister Purge Regulator Valve -N80- but leave electrical connector connected.
- Connect auxiliary hose to one connection of EVAP Canister Purge Regulator Valve - N80-.
- Connect vehicle diagnostic, testing and information system VAS 5051 or V.A.G 1551 Scan Tool and select engine electronics control module with "Address word". Ignition must be switched on.

- Initiate output Diagnostic Test Mode (DTM) and activate EVAP Canister Purge Regulator Valve -N80-.

- The valve should click...
- ...and should open and close (check by blowing into the auxiliary hose).

- End function "03 - Output Diagnostic Test Mode (DTM)" by pressing <- button

If valve does not open or close properly:
- Replace EVAP Canister Purge Regulator Valve -N80-.

If the fuel injector does not click:

Checking internal resistance
- Disconnect connector on EVAP Canister Purge Regulator Valve -N80-.







- Connect multimeter to fuel injector to measure resistance.

- Specified value: 22 to 30 Ohms

If specified value is not obtained:
- Replace EVAP Canister Purge Regulator Valve -N80-.

If specified value is obtained:

Checking power supply

Requirements
- Fuse for Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- OK.
- Fuel pump relay OK; checking.

NOTE: The EVAP Canister Purge Regulator Valve -N80- receives its power supply via the fuel pump relay.

- Disconnect connector on EVAP Canister Purge Regulator Valve -N80-.







- Connect LED voltage tester V.A.G 1527 B as follows:

Connector terminal Measure to
1 Engine ground (GND)

- Operate starter briefly (engine may start).
- LED must light up.

If LED does not light up:
- Check wiring from terminal -1- on connector via fuse to fuel pump relay for an open circuit:
- Repair open circuit, if necessary.

If LED lights up:

Checking activation







- Connect LED voltage tester V.A.G 1527 B to terminals -1- (positive) and -2- of connector.
- Initiate output Diagnostic Test Mode (DTM) and activate EVAP Canister Purge Regulator Valve -N80-.
- LED must flash.

If LED lamp does not flash or if it lights up continuously:
- Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect ECM.







- Check for open circuit and short to positive (B+) or ground (GND) in following wiring connection:

Connector Test box V.A.G 1598/31
terminal Socket
2 64

- Repair any open/short circuit as necessary.

If the wiring is OK:
- Replace Engine Control Module (ECM).