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 VAG 1551 Scan Tool and select engine electronics control module by entering address word "01", [1][2]Scan Tool Connecting and Initial Checks . When doing this the ignition must be switched on.
- Start output Diagnostic Test Mode and select Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80, Output Diagnostic Test Mode (DTM) (Function 03)
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 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 VAG 1527 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. Correct open circuit if necessary.
- If wiring is OK, check fuel pump relay, Testing and Inspection
If the diode test lamp lights up, check activation.
Checking activation of Evaporative Emission (EVAP) Canister Purge Regulator Valve
- Connect VAG 1527 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, Output Diagnostic Test Mode (DTM) (Function 03)
The diode test lamp should blink.
If the diode test lamp does not blink or lights up continuously:
- Connect VAG 1598/31 test box to multi-pin harness connector for engine control module. DO NOT connect to engine control module itself, Connecting VAG 1598/31 Test Box
If the diode test lamp lights up continuously:
- Check for short circuit to Ground (GND) in the following wiring connection:
2-pin connector on VAG 1598/31
wiring harness, test box socket
socket
2 64
If the diode test lamp does not flash:
- Check for short to B+ or open circuit in following wiring connection:
2-pin connector on VAG 1598/31
wiring harness, test box socket
socket
2 64
Resistance in wiring: max. 1.5 ohm
- If necessary, correct 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, Readiness Code Reading . Readiness code must be generated if DTC memory was erased, Readiness Code, Generating