DME 7.8 DME 7.8 0 · 0-65P0441

DME 7.8 DME 7.8 0 0-65P0441 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 Affected terminals - 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. Work instruction Display OK If not OK 1 Check installation position Flow through the EVAP canister of EVAP canister purge purge valve is possible in one direc- valve tion only. The flow direction is indi- cated by an arrow on the EVAP canister purge valve. The arrow must point towards the intake mani- fold. 2 Check triggering of EVAP ♦Connect Porsche System Tester The EVAP canister canister purge valve. 2 purge valve must switch audibly. ♦In the "Drive links" menu, select EVAP canister purge valve. 2023 P0441 0-65 page 1 Printed in Germany – 1, 2000 p0441