EVAP Canister Purge Regulator Valve, 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 fuse OK.
- The Fuel Pump (FP) Relay J17 OK.
- The ignition switched off.

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

Test procedure
- Perform a preliminary check to verify the customers complaint. Service and Repair

Start diagnosis

- Remove the engine cover with air filter.






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

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 voltage.






- Operate the starter briefly.

Specified value: battery voltage.

If the specified value is not obtained:

- Check the wiring connection from the electrical harness connector terminal 1 to the Fuel Pump (FP) Relay J17 terminal 23/87 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 voltage.






- 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 Test Box 105 Pin VAG1598/31.

If the manufacturers test box is not being used. Perform the following step.

- Remove the Motronic Engine Control Module (ECM) J220. Service and Repair






- 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 T121 terminal 5 for an open circuit.






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 electrical harness connector for damage, corrosion, lose or broken terminals.

- If necessary, repair the wiring connection.

If the specification was obtained:

- Erase the DTC memory. Diagnostic Mode 4: Reset/Erase Diagnostic Data

- 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) J220. Service and Repair

- Assembly is performed in the reverse of the removal.

Final procedures

After the repair work, the following work steps must be performed in the following 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