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

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

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.

NOTE: Voltage for the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 is supplied via the Engine Component Power Supply Relay J757.

Procedure







- Remove the engine cover with air filter.







- Disconnect the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical harness connector - 1 - .

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 Ohms.

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 Measure to
Regulator Valve N80 electrical harness
connector terminal
1 Engine Ground GND)

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

If the specified value is not obtained:
- Check the wiring connection from terminal 2 of Fuel Pump Relay J17 to pin 1 of N80 connector 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 Measure to
Regulator Valve N80 electrical
harness connector terminal
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.

If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J220.







- 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 terminal 64 for an open circuit.

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

Specified value: 1.5 Ohms max.

If the specification is not obtained:
- Check the wiring for a short circuit to Battery positive (+) or an open circuit.
- Check the wiring for a short circuit to Battery positive (+) or an open circuit.
- If necessary, repair the wiring connection.

If the specification was obtained:
- Replace the Motronic Engine Control Module (ECM) J220.
- Install the engine cover with air filter.

Final procedures
After the repair work, the following work steps must be performed in the following 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.

- End of diagnosis.