EVAP Canister Purge Regulator Valve -N80-, Checking

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







Special tools and equipment
- VAG 1526A
- VAG 1527B
- VAG 1594A
- VAG 1598/31
- VAS5051 with VAS5051/1

Checking 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". Ignition must be switched on.
- Initiate Output Diagnostic Test Mode (DTM) and activate evaporative emission (EVAP) canister purge regulator valve -N80-. Output Diagnostic Test Mode (DTM) (Function 03)
- The valve should click ...
- ... and should open and close (check by blowing into auxiliary hose).
- Press <- button to end function "03 - Final Control Diagnosis", also known as Output Diagnostic Test Mode (DTM).

If valve does not open and close properly:
- Replace evaporative emission (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; Testing and Inspection

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 VAG 1527 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 activation
- Connect voltage tester VAG 1527 B to terminals 1 (positive) and 2 of connector.
- Initiate output Diagnostic Test Mode (DTM) and activate Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-. Output Diagnostic Test Mode (DTM) (Function 03)
- LED should flash.

If the LED lamp does not flash or if it illuminates continuously:
- Connect test box VAG 1598/31 to wiring harness for engine control module; do not connect engine control module. Wiring and Component Testing Using VAG1598/31 Test Box
- Check for open circuit and short to positive or Ground in following wiring connection:

Connector Test box VAG 1598/31
terminal Socket
2 64

- Repair any open/short circuit as necessary.

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