Manufacturer's Scan Tool

EVAP Canister Purge Regulator Valve, Checking

Special tools, testers and auxiliary items required

• (VAG1526A)

• (VAG1527B)

• (VAG1594A)

• (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). Refer to => [ Output Diagnostic Test Mode ] Output Diagnostic Test Mode.

• The valve should click...

• ... and should open and close (check by blowing into the auxiliary hose).

- Press arrow -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. Refer to => [ Fuel Pump Relay and Activation, Checking ] Fuel Pump Relay and Activation, Checking.

• 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 (VAG1527B) as follows:









- 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. Refer to

- Repair open circuit, if necessary.

If the LED illuminates:

Checking actuation

- Connect voltage tester (VAG1527B) to terminals 1 (positive) and 2 of connector.





- Initiate final control diagnosis and activate Evaporative Emission (EVAP) canister purge regulator valve (N80). Refer to => [ Output Diagnostic Test Mode ] Output Diagnostic Test Mode.

• 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. Refer to => [ Wiring and Component Check with Test Box VAG 1598/31 ] Wiring and Component Check With Test Box VAG 1598/31.

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









- Repair any open/short circuit as necessary.

If the wiring is OK:

- Replace engine control module:

• With anti-theft housing. Refer to => [ Engine Control Module with Metal Anti-Theft Housing ] Engine Control Module With Metal Anti-Theft Housing.

• Without anti-theft housing. Refer to => [ Engine Control Module without Metal Anti-Theft Housing ] Engine Control Module Without Metal Anti-Theft Housing.