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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Self Diagnostics - 4.7L) >> Diagnostic Tests >> DTC P0440: General EVAP System Failure >> Monitored & Set Conditions

Monitored & Set Conditions

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

This code is monitored with the engine running. Fuel level greater than 12 percent. Ambient temperature between 39-89°F (4-32°C). The code is set when the PCM does not see the Natural Vacuum Leak Detection (NVLD) switch close during the medium/large leak test. The PCM will then increase the vacuum supply to the EVAP system by increasing flow through the EVAP Purge valve. If the switch does not close with an increase in vacuum, an error is detected. This is a two trip fault.

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