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EVAP Canister Purge Regulator Valve, Checking



EVAP Canister Purge Regulator Valve, 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 (ECM)
Canister Purge Regulator J623 or Test box socket
Valve N80 Electrical harness
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. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

- Switch the ignition off.