Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 531
DME 7.8 DME 7.8 0 · 0-64P0440
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DME 7.8 DME 7.8 0
0-64P0440
93 Fuel Tank Ventilation System (DTESK) - Above Limit
Diagnosis conditions
• Oxygen sensing system active
• Engine running
• Vehicle speed = 0 km/h
• Intake air temperature between 5 °C and 60 °C
• Altitude correction factor greater than 0.75
• Battery positive voltage greater than 11 V
• Engine load less than 30%
• EVAP canister burden less than 3
• Time elapsed after engine start-up greater than 990 seconds or
mixture adaptation completed
• No other faults in memory
Possible fault cause
♦Tank cap seal
♦One or several leaks in fuel tank ventilation system
Affected terminals
-
Diagnosis/troubleshooting
2023 P0440 0-64 page 1
Printed in Germany – 1, 2000 p0440
This is a source reference. Confirm exact model applicability in the original material.