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.
- Wiring diagram.

Test requirements
- The Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 Engine Electronics Fuse S282 OK.
- The ignition switched off.

NOTE: Voltage for the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 is supplied via the Fuel Pump (FP) Relay J17.

Procedure







- Remove the right side engine compartment cover - 1 -.







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

Checking internal resistance







- Using a Multimeter , check the resistance between terminals 1 and 2 of the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.
Specified value: 22,0 to 30,0 Ohms.

If the specified value was 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 to Ground (GND) for voltage.

Evaporative Emission (EVAP) Measure to
Canister Purge Regulator Valve
N80 Electrical Harness
connector Terminal
1 Engine Ground GND)

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

If the specified value was not obtained:
- Check the wiring connection from the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical harness connector terminal 1 to the Fuel Pump (FP) Relay J17 terminal 2 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:

Checking wiring
If the manufacturers test box is being used. Perform the following step.
- Install the test box.

If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J623.







- Using a Multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical connector terminal 2 to the Engine Control Module (ECM) J623 electrical connector T121 terminal 64 for an open circuit.

Evaporative Emission (EVAP) Engine Control Module
Canister Purge Regulator Valve (ECM) J623 or Test box
N80 Electrical harness socket
connector terminal
2 64

Specified value: 1.5 Ohms.

If the specification was 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:
- 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.