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 off.
- 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 greater than 10 volts.
- Start-up ECT is 40-131°F (4-55°C).
- IAT is between 40-140°F (4-60°C).
- Fuel tank pressure must be -7.23-3.61 in. H20 to enable test.
- Long term fuel trim 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, MAF, system voltage, throttle actuator, TP sensor or vehicle speed DTCs have been set.
DTC sets if fuel tank pressure indicates greater than 1.54 volts (less than -0.19 in. H20) during phase B of the EVAP diagnostic system test indicating continuous purge flow. Condition exists anytime during phase B (3 seconds).
The entire EVAP diagnostic test will take about 16 seconds to complete when no errors have been detected. If the P0496 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.