P0440-General EVAP System Failure: Notes

Fig 1: Fuel Tank Pressure Sensor Circuit Schematic

Courtesy of CHRYSLER LLC

1. When Monitored  : Engine Running. Cold start test. Fuel Level greater than 12%. Ambient Temperature between 4°C and 32°C (39°F and 89°F) Close Loop fuel system. Test runs when small leak test is maturing.
2. Set Condition  : The PCM activates the EVAP Purge Solenoid to pull the EVAP system into a vacuum. The PCM turns the EVAP Purge solenoid off to seal the EVAP system. If the Fuel Tank Pressure Sensor reads between -1.5 to +1.0 hPa before the calibrated amount of time for a Medium leak/Small leak an error is detected. Two Trip Fault.

For a complete Powertrain Control Module Circuit Diagram, refer to SCHEMATICS AND DIAGRAMS .