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

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







Recommended special tools and equipment
- VAG1526A multimeter
- VAG1594A connector test kit
- VAG1598/31 test box

Test requirements:
- Fuse for Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- OK
- Fuel Pump (FP) Relay OK; checking. Testing and Inspection
- Ignition switched off.

NOTE: Voltage for Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- is supplied via the fuel pump relay.

Work procedure
- Disconnect electrical harness connector from Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-.

Checking internal resistance







- Connect multimeter at valve for resistance measurement.
- Specified value: 22 to 30 Ohms

If specified value is not obtained.
- Replace Evaporative Emission (EVAP) canister purge regulator valve -N80-.

If specified value is obtained:

Checking voltage supply







- Connect multimeter between terminal 1 and 2 for voltage measurement.
- Operate starter briefly.
- Specified value: approx. battery voltage

If there is no voltage:
- Connect multimeter for voltage measurement as follows:

Harness connector Terminal Measure to
1 Engine Ground (GND)

- Operate starter briefly.
- Specified value: approx. battery voltage

If there is no voltage again:
- Check wire connection from harness connector terminal 1 to Fuel Pump (FP) Relay - J17- via fuse for open circuit according to wiring diagram.
- Specified value: Wire resistance max 1.5 Ohms
- If necessary, repair wire connection.

If voltage supply is OK:

Check Ground (GND) activation







- Connect multimeter for voltage measurement as follows:

Harness connector Terminal Measure to
2 B+

- Operate starter briefly.
- Specified value: approx. battery voltage
- Switch ignition off.

If specified value is not obtained:
- Connect test box to wiring harness of Engine Control Module (ECM); ECM is not connected.







- Check the following wire connection for open circuit according to wiring diagram:
Harness connector Terminal Test box Socket
2 64

- Specified value: Wire resistance max 1.5 Ohms
- Check wire for short circuit to B+ and to Ground (GND).
- Specified value: Infinity ohm (no continuity)
- If necessary, repair wire connection.

If no malfunctions are found in wires:
- Replace Engine Control Module (ECM).

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If DTC memory was erased, generate readiness code.

- End diagnosis and switch ignition off.