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

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







Special tools and equipment
- VAG1526 A
- VAG1527 B
- VAG1594 A
- VAG1598/31
- VAS5051 with VAS5051/1

Testing for leaks
When there is no electrical supply, solenoid valve remains closed.
- Disconnect hoses from EVAP canister purge regulator valve but leave electrical connector plugged in.
- Connect auxiliary hose to one connection of EVAP canister purge regulator valve.
- Connect testing and information system VAS5051 and select vehicle system "01 - Engine electronics" in selection. Ignition must be switched on.
- Initiate final control diagnosis and activate EVAP canister purge regulator valve -N80-.

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

- Press square -button to end function "03 - Final Control Diagnosis" [also known as Output Diagnosis Test Mode (DTM)].

If valve does not open and close properly:
- Replace EVAP canister purge regulator valve -N80-.

If the injector does not click:

Checking internal resistance
- Disconnect connector on EVAP canister purge regulator valve.







- Connect multimeter to injector to measure resistance.

Specified value: 22 to 30 Ohms

If specification is not obtained:
- Replace Evaporative Emission (EVAP) canister purge regulator valve -N80-.

If specified value is obtained:

Checking power supply

Test requirements
- Fuse for EVAP canister purge regulator valve OK.
- Fuel pump relay OK; checking.

NOTE: The EVAP canister purge regulator valve receives its power supply via the fuel pump relay.

- Disconnect connector on EVAP canister purge regulator valve.







- Connect voltage tester VAG1527 B as follows:

Connector Measure to
terminal
1 Engine ground

- Operate starter briefly (engine may start).
- LED should illuminate.

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

If the LED illuminates:

Checking actuation







- Connect voltage tester VAG1527 B to terminals 1 (positive) and 2 of connector.
- Initiate final control diagnosis and activate Evaporative Emission (EVAP) canister purge regulator valve -N80-.
- LED should flash.

If the LED lamp does not flash or if it illuminates continuously:
- Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module.







- Check for open circuit and short to positive or Ground in following wiring connection:

Connector Test box VAG1598/31
terminal Socket
2 64

- Repair any open/short circuit as necessary.

If the wiring is OK:
- Replace engine control module.