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 Fuel Pump (FP) Relay J17 OK.
• The ignition switched off.

Test procedure 

• Perform a preliminary check to verify the customers complaint. Refer to → Motronic Engine Control Module (ECM) J220 , replacing 

Start diagnosis 

• Remove the engine cover with air filter. Refer to 24 MULTIPORT FUEL INJECTION (MFI) for Engine Code AWD and 24 MULTIPORT FUEL INJECTION (MFI) for Engine Codes AWP and AWW .

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

Checking internal resistance 

• 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.

If the specified value is not obtained:

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

If the specification is obtained:

Checking voltage supply 

• 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:

• Using a Multimeter , check the electrical harness connector terminal 1 for voltage.

Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical harness connector terminal	Measure to
1	Engine Ground (GND)

• 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 Fuel Pump (FP) Relay J17 terminal 23/87 for an open circuit.
• 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 

• Using a Multimeter , check the electrical harness connector for voltage.

Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical harness connector terminal	Measure to
2	Battery positive (+)

• Operate the starter briefly.

Specified value: battery voltage.

• Switch the ignition off.

If the specified value was not obtained:

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

• Install the test box Test Box 105 Pin VAG1598/31. Refer to 24 MULTIPORT FUEL INJECTION (MFI) for Engine Code AWD and 24 MULTIPORT FUEL INJECTION (MFI) for Engine Codes AWP and AWW .

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

• Remove the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220 , replacing  .

• Using a Multimeter , check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical connector terminal 2 to Motronic Engine Control Module (ECM) J220 electrical connector T121 terminal 5 for an open circuit.

Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical harness connector terminal	Motronic Engine Control Module (ECM) J220 electrical harness connector T121 terminal test box socket
2	64

Specified value: 1.5 Ω max.

If the specification is not obtained:

• Check the wiring for a short circuit to Battery positive (+) 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:

• Erase the DTC memory. Refer to → Diagnostic Mode 04: Reset/delete diagnostic data 
• Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to →Readiness Code  .

• End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:

• Replace the Motronic Engine Control Module (ECM) J220. Refer to 24 MULTIPORT FUEL INJECTION (MFI) for Engine Code AWD and 24 MULTIPORT FUEL INJECTION (MFI) for Engine Codes AWP and AWW .
• Assembly is performed in the reverse of the removal.

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.
3. If the DTC memory was erased, generate readiness code.

End diagnosis