DME 7.8 DME 7.80 · ♦Fuel tank ventilation diagnosis is initiated with the Porsche System Tester 2 in t

DME 7.8 DME 7.80 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. ♦A frozen EVAP canister shutoff valve can lead to this fault. Work instruction Display OK If not OK 1 Check tank cap and seal ♦ Check whether the tank cap is present. ♦Check whether the tank cap is correctly screwed on. ♦Check whether the seal is dam- aged. 2 Check ventilation lines on ♦Remove front right-hand wheel EVAP canister housing liner. ♦Check whether ventilation lines are attached to the EVAP canis- ter. 3 Check ventilation line on ♦Remove battery. tank ♦Remove battery cover. ♦Check whether ventilation line is attached to the fuel tank sender unit. 4 Check ventilation line on ♦Check whether ventilation line is tank vent attached to the EVAP canister purge valve. 5 Check ventilation lines ♦Check whether ventilation lines are: ♦cracked ♦broken ♦interrupted 6 Check EVAP canister ♦Remove front right-hand wheel purge valve housing liner. ♦Clean EVAP canister in the vicin- ity of the ventilation lines. ♦Detach the ventilation line to the EVAP canister purge valve at the EVAP canister (connection with protective cap). ♦With special tool 9160/1, gener- ate a vacuum of 200 mbar (0.2 bar). If no vacuum can be built up, replace the EVAP canister purge valve. 0-75 page 2 2023 P0455 p0455 Printed in Germany – 1, 2000