DME 7.8 DME 7.8 0 · 0-72.1P0450

DME 7.8 DME 7.8 0 0-72.1P0450 Fuel Tank Ventilation System (Major Leak) – Signal Implausible Diagnosis conditions • Oxygen sensing system active • No secondary air diagnosis • Engine running • Vehicle speed = 0 km/h • Intake air temperature between 4.5 °C and 60 °C • Battery positive voltage greater than 11 V • Engine load less than 30% • EVAP canister burden less than 3 • Altitude correction factor greater than 0.75 • Time elapsed after engine start-up > 990 seconds or mixture adaptation completed • No faults in memory Possible fault cause ♦Pressure sensor 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 Replace pressure sensor. 2023 P0450 0-72.1 page 1 Printed in Germany – 6, 2002 p0450a