DTC Parameters
WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.
- EVAP vent solenoid commanded on (closed).
- EVAP purge solenoid commanded to a fixed duty cycle (pulses valve).
- Engine is running.
- Fuel tank level 15-85 percent.
- BARO more than 75 kPa.
- ECT and IAT between 39-86°F (4-30°C) at engine start-up.
- ECT and IAT are within 14°F (8°C) of each other.
- TP angle 7-35 percent.
- Vehicle speed less than 70 MPH.
- No ECT, fuel tank pressure, IAT, MAP, HO2S1, PCM internal fault, TP or VSS DTCs are set.
DTC sets when fuel tank pressure voltage is more than one volt during P0440 diagnostic test indicating a vacuum cannot be pulled on EVAP system. Condition must exist for more than 6 minutes and 40 seconds.
DTC P0440 diagnostic runs once per ignition cycle (usually for 30 seconds when no faults exist) once the above conditions have been met. If this test fails, a warm test will be performed and can only PASS a diagnostic test, not fail it. The purpose of this test is to keep the MIL Off during the initial test if the customer starts the vehicle with the fuel cap off.