EVAP Canister Purge Regulator Valve N80, Checking

EVAP Canister Purge Regulator Valve N80, Checking

Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.

Test requirements
- Fuse SB6 OK.
- The ignition switched off.

Test procedure
- Perform a preliminary check to verify the customers complaint. Preliminary Check

Start diagnosis

NOTE: The voltage for the Leak Detection Pump (LDP) -V144- is supplied by the Motronic Engine Control Module (ECM) Power Supply Relay 2 J670.

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

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.
- Turn the key on.
- Operate the starter briefly.

Specified value: 12.5 V 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) 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 was not obtained:
- Check the wiring connection from the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay 2 J670 terminal 2/87 for an open circuit or a short circuit to Ground (GND).
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the wiring connection.

If the specified value was obtained:

Check Ground (GND)

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 Motronic Engine Control Module (ECM) J623 electrical connector T60 terminal 5 for resistance.

Evaporative Emission (EVAP) Motronic Engine Control
Canister Purge Regulator Module (ECM) J623 or Test
Valve N80 Electrical harness box socket T60
connector terminal
2 5

Specified value: 1.5 Ohms.

If the specification was not obtained:
- Check the wiring for a short circuit to Battery positive (+), Ground (GND) or an open circuit.
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the wiring connection.
- Erase the DTC memory. Diagnostic Modes 01 - 09.
- Perform a road test to verify repair.

If the DTC does not return:
Repair complete, Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
- 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) J623.
- Assembly is performed in the reverse of the removal.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:

1. Check the DTC memory. Diagnostic Modes 01 - 09
2. If necessary, erase the DTC memory. Diagnostic Modes 01 - 09
3. If the DTC memory was erased, generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

End of Diagnosis