EVAP Canister Purge Regulator Valve, Checking
Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.
Test requirements
- Fuses SA15 and SA18 OK.
- Engine Component Power Supply Relay J757 OK.
- The ignition switched off.
- Voltage for the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 is supplied through the Engine Component Power Supply Relay J757.
Test procedure
- Perform a preliminary check to verify the customers complaint. Refer to → Preliminary Check .
- Remove the rear engine cover - arrows -.
- Disconnect the electrical harness connector - 3 - from the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.
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 to 30 Ω
If the specified value is not obtained:
- Replace the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80. → Refer to the appropriate service information
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 Engine Ground (GND) for voltage.
| Harness connector Terminal | Measure to |
|---|---|
| 1 | Engine Ground (GND) |
- Operate the starter briefly.
Specified value: battery voltage.
If the specified value was not obtained again:
- Check the wiring connection from the electrical harness connector terminal 1 to the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 for an open circuit according to wiring diagram.
Specified value: 1.5 Ω
- If necessary, repair the wiring connection.
If the voltage supply is OK:
Check Ground (GND) activation
- Using a Multimeter , check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical connector terminal 2 to B+
| Harness connector Terminal | Measure to |
|---|---|
| 2 | B+ |
- Operate the starter briefly.
Specified value: battery voltage
- Switch the ignition off.
If the specified value is not obtained:
If the manufacturers test box is being used, perform the following step.
- Install the test box VAG1598/42. Refer to 24 - FUEL INJECTION SYSTEM .
If the manufacturers test box is not being used, perform the following step.
- Remove the Engine Control Module (ECM) J623. Refer to → Engine Control Module, Replacing .
- 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 harness connector terminal 49 for resistance.
| Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 Electrical harness connector terminal | Engine Control Module (ECM) J623 electrical harness connector terminal |
|---|---|
| 2 | 49 |
Specified value: Wire resistance max 1.5 Ω
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.
- If the wiring is OK, replace the Engine Control Module (ECM) J623. Refer to → Engine Control Module, Replacing .
If the specification was obtained:
- Erase the DTC memory. Refer to → Diagnostic Mode 04 - Reset/Delete Diagnostic Data .
- Perform a road test to verify repair.
If the DTC does not return:
Repair complete, Generate readiness code. Refer to → Readiness Code .
- End diagnosis.
- Assembly is performed in the reverse of the removal.
After repair work, the following work steps must be performed in the mentioned sequence:
- Check the DTC memory.
- If necessary, erase the DTC memory. Refer to Diagnostic Mode 04 - Reset/Delete Diagnostic Data .
- If the DTC memory was erased, generate readiness code. Refer to Readiness Code .