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

Special tools, testers and auxiliary items required 

• Multimeter.
• Wiring diagram.

Test requirements 

• The Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 fuse OK.
• The ignition switched off.

Test procedure 

• Perform a preliminary check to verify the customers complaint. Refer to → General Diagnosis .

Start diagnosis 

Fig 1: Removing/Installing Rear Engine Cover

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Remove the rear engine cover - arrows  -.

Fig 2: Identifying Electrical Harness Connectors

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

Checking internal resistance 

Fig 3: Identifying 2-Pin Electrical Harness Connector

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Using a Multimeter , check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 terminals 1 and 2 for resistance.

Specified value: 22,0 to 30,0 Ω.

Engine Component Power Supply Relay J757

• Replace the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.

If the specification is obtained:

Checking voltage supply 

Fig 4: Identifying 2-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Using a Multimeter , check the electrical harness connector terminal 1 to 2 for voltage.
• Operate the starter briefly.

Specified value: battery voltage.

If the specified value was not obtained:

Fig 5: Identifying 2-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Using a Multimeter , check the electrical harness connector terminal 1 to Ground (GND) for voltage.

• Operate the starter briefly.

Specified value: battery voltage.

If the specified value is not obtained:

• Check the wiring connection from the electrical harness connector terminal 1 to the Engine Component Power Supply Relay J757 terminal 2/87 for an open circuit or short to Ground (GND).
• Check the electrical harness connector for damage, corrosion, lose or broken terminals.
• If necessary, repair the wiring connection.

If the specified value was obtained:

Check Ground (GND) activation 

If the manufacturers test box is being used. Perform the following step.

• Install the test box. Refer to → 24 - FUEL INJECTION SYSTEM .

If the manufacturers test box is not being used. Perform the following step.

• Remove the Engine Control Module (ECM) J623. Refer to → Engine Control Module (ECM) J623 , Removing and Installing .

Fig 6: Identifying 2-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Using a Multimeter , check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical connector terminal 2 to Engine Control Module (ECM) J623 electrical connector T94 terminal 49 for an open circuit.

Specified value: 1.5 Ω max.

If the specification is not obtained:

• Check the wiring for a short circuit to Battery positive (+), Ground (GND) or an open circuit.
• Check the electrical harness connector for damage, corrosion, lose or broken terminals.
• If necessary, repair the wiring connection.

If the specification was obtained:

• Replace the Engine Control Module (ECM) J623. Refer to → Engine Control Module (ECM) J623 , Removing and Installing .

Fig 7: Removing/Installing Rear Engine Cover

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Install the rear engine cover - arrows  -.

Final procedures 

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to Diagnostic Mode 04: Reset/delete Diagnostic Data .
3. If the DTC memory was erased, generate readiness code. Refer to Readiness Code .

• End of diagnosis.