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.