DTC Parameters
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- EVAP purge solenoid is commanded to a 12 percent duty cycle.
- EVAP vent solenoid is commanded on.
- Engine is at idle.
- Vehicle speed is zero MPH.
- Volumetric efficiency is less than 35 percent.
- Main relay voltage is more than 10 volts.
- ECT at engine start up is 40-131°F (4-55°C).
- IAT is 40-140°F (4-60°C).
- Fuel tank pressure must be -7.23-3.61 in. H2O to enable test.
- Long term fuel cells learned (if not learned, engine must run longer than 16 minutes and 45 seconds).
- Fuel level is 2.4-13.4 gallons.
- No ECT, EVAP purge solenoid, EVAP vent solenoid, fuel tank pressure, idle speed, HO2S, throttle actuator, TP sensor or vehicle speed DTCs have been set.
DTC sets if fuel tank pressure cannot be pulled less than 2.02 FTP sensor volts (less than -2.61 in. H20) during phase D of the EVAP diagnostic system test indicating a large EVAP leak. Condition exists for 8 seconds or no change is detected for 4 seconds.
The entire EVAP diagnostic test will take about 16 seconds to complete when no errors have been detected. If the P0440 diagnostic fails, the rest of the EVAP diagnostic test is aborted and not run again in the ignition cycle.
If an EVAP diagnostic test is aborted due to changing enable criteria, the ECM will run the EVAP diagnostic test up to 10 times per ignition cycle.