EVAP Canister Purge Regulator Valve -N80, Checking

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

Checking for leaks

If there is no electrical signal (not activated) the solenoid valve remains closed.
- Disconnect hoses from Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.
- Connect an auxiliary test hose to one of the connections on (EVAP) Canister Purge Regulator Valve.
- Connect vehicle diagnostic, testing and information system VAS5051 or VAG1551 scan tool and select engine electronics control module by entering address word "01". When doing this the ignition must be switched on. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAS5051 or VAG1551" Testing and Inspection
- Start output Diagnostic Test Mode and select Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80. Refer to Scan Tool Testing/Output Diagnostic Test Mode (DTM) (Function 03) Testing and Inspection

Indicated on display


Output Diagnostic Test Mode ->
EVAP canister purge regulator valve -N80


The valve should click and should open and close (test by blowing into auxiliary hose).

- If valve does not click, carry out electrical test of Evaporative Emission (EVAP) Canister Purge Regulator Valve.
- If valve does not open and close properly, replace Evaporative Emission (EVAP) Canister Purge Regulator Valve.

Electrical testing of Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80

- Disconnect connector from Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.







- Measure resistance between contacts on valve using hand-held multimeter Fluke 83 (or equivalent).

Specification: 22 to 30 ohm

If the specification is not obtained:
- Replace Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.

If the specification is obtained:
- Check voltage supply.

Checking power supply to solenoid valve


NOTE: The Evaporative Emission (EVAP) Canister Purge Regulator Valve receives its power supply via the fuel pump relay.


- Check fuse for Evaporative Emission (EVAP) Canister Purge Regulator Valve

If the fuse is OK:
- Disconnect harness connector on Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.







- Connect VAG1527B diode test lamp between engine Ground (GND) and socket 1 on connector.
- Operate starter.

The diode test lamp should light up.

If diode test lamp does not light up:
- Check continuity of wiring from socket 1 to fuel pump relay via fuse. Repair open circuit if necessary.
- If wiring is OK, check fuel pump relay. Testing and Inspection

If the diode test lamp lights up, check activation.

Testing activation of Evaporative Emission (EVAP) Canister Purge Regulator Valve







- Connect VAG1527B between diode test lamp sockets 1 (B+) and 2 of harness connector.
- Start output Diagnostic Test Mode (DTM) and select Evaporative Emission (EVAP) Canister Purge Regulator Valves -N80. Refer to Scan Tool Testing/Output Diagnostic Test Mode (DTM) (Function 03) Testing and Inspection

The diode test lamp should blink.

If the diode test lamp does not blink or lights up continuously:
- Connect VAG1598/31 test box to multi-pin harness connector for engine control module. Do not connect to the engine control module itself. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" Testing and Inspection

If the diode test lamp lights up continuously:
- Check for short circuit to Ground (GND) in the following wiring connections:

2-pin connector on VAG1598/31 test box,
wiring harness, socket
socket
2 64

If the diode test lamp does not flash:







- Test for short to B+ or open circuit in the following wiring connections:

2-pin connector on VAG1598/31 test box,
wiring harness, socket socket
2 64

Resistance in wiring: max. 1.5 ohm

- If necessary, repair short circuit to Ground (GND) or open circuit.

If no short circuit or open circuit is found
- Replace Motronic Engine Control Module (ECM) -J220.
- Display readiness code. The readiness code must be generated if the DTC memory was erased.
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Readiness Code" Testing and Inspection
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code" Testing and Inspection