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

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

Special tools, testers and auxiliary items required
- Multimeter V.A.G 1526 or equivalent.
- Test Box 105 Pin VAG1598/42.
- Adapter Lead Vag1598/39 VAG1598/39.
- Adapter cable V.A.G 1598/39-1.

Test requirements
- The fuse for the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 OK.
- The ignition switched off.

NOTE Voltage for the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 is supplied via the Engine Component Power Supply Relay J757.

Procedure
- Disconnect the electrical harness connector - 3 - from the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.

Checking internal resistance
- Using the Multimeter V.A.G. 1526 A or equivalent, check the resistance between the terminals of the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 .
Specified value: 22,0 to 30,0 Ohms.

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

Checking voltage supply

If the specification is obtained:







- Using the Multimeter V.A.G. 1526 A or equivalent, check the electrical harness connector terminal 1 to 2 for voltage.
- Operate the starter briefly.
Specified value: approx. battery voltage

If there is no voltage:
- Using the Multimeter V.A.G. 1526 A or equivalent, check the electrical harness connector terminal for voltage.

Harness connector Terminal Measure to
1 Engine Ground (GND)

- Operate the starter briefly.
Specified value: aprox. battery voltage

If there is no voltage again:
- Check the wiring connection from the electrical harness connector terminal 1 to the Leak Detection Pump (LDP) -V144- terminal 3 for an open circuit according to wiring diagram.
Specified value: Wire resistance max 1.5 Ohms.
- If necessary, repair the wiring connection.

If the voltage supply is OK:

Check Ground (GND) activation







- Using the Multimeter V.A.G. 1526 A or equivalent, check the electrical harness connector for voltage.

Harness connector Terminal Measure to
2 Battery positive (+)

- Operate the starter briefly.
Specified value: aprox. battery voltage.

- Switch the ignition off.

If the specified value is not obtained:
- Connect the test box 1598/42 to the wiring harness of the Engine Control Module (ECM) J623. The ECM is not connected.







- Using the Multimeter V.A.G. 1526 A or equivalent, the following wire connection for open circuit.

Harness connector Terminal Test box Socket
2 49

Specified value: Wire resistance max 1.5 Ohms.
Specification: 0 Ohms.

If the specification is not obtained:
- Check the wiring for a short circuit to Battery positive (+) or an open circuit.
- If necessary, repair the wiring connection.

If the specification is obtained:
- Replace the Engine Control Module (ECM) J623

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check the DTC memory.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code.

- End diagnosis and switch the ignition off.