2 Check triggering of EVAP canister purge valve.
1. Connect Porsche System Tester 2.
2. In the "Drive links" menu, select EVAP canister purge valve. The EVAP canister purge valve must switch audibly.
3 Check voltage supply and wiring.
1. Remove connector of EVAP canister purge valve.
2. Connect voltmeter (positive) to pin 1 of the connector and to ground.
3. Switch on the ignition.
Display: battery voltage
4. Connect special tool 9637 to wiring harness.
5. Connect ohmmeter to pin III/3 and EVAP canister purge valve connector, pin 2.
Display: 0 - 5 ohms
4 Check EVAP canister purge valve.
1. Disconnect hose from EVAP canister purge valve to intake system at EVAP canister purge valve.
2. Remove connector of EVAP canister purge valve.
3. Connect special tool 9160/1 to EVAP canister purge valve.
4. Generate vacuum of approx. 0.7 bar.
The vacuum must not fall below 0.5 bar after 10 minutes.
5 Check hose line between EVAP canister purge valve and air intake system.
1. Undo hose at intake system.
2. Remove connector of EVAP canister purge valve.
3. Connect special tool 9160/1 to hose and generate a vacuum of approx. 0.7 bar.
The vacuum must not fall below 0.5 bar after 10 minutes.
P0441
P0441
93 Fuel Tank Ventilation System - Above Limit
Diagnosis conditions
- Engine idling
- Vehicle speed = 0 km/h
- Oxygen sensing system active
- No secondary air diagnosis
- No other faults in memory
Possible fault cause
- EVAP canister purge valve incorrectly installed
- EVAP canister purge valve faulty
- Blocked purge air line
- EVAP canister purge valve leaking
- Leaking line between EVAP canister and air intake system
Diagnosis/troubleshooting
NOTE: Fuel tank ventilation diagnosis is initiated with the Porsche System Tester 2 in the "Short test" menu. This reduces the time elapsed after
engine start-up to 30 seconds.