Circuit Description

Evaporative (EVAP) emission system includes following components: fuel tank, EVAP vent solenoid, fuel tank pressure sensor, fuel pipes and hoses, vapor lines, fuel cap, EVAP emission canister, purge lines, and EVAP purge solenoid.

Conditions required to set DTC are:

• No IAT, MAP, ODM, or TP sensor DTCs set.
• Start-up ECT is 40-86°F (4-30°C).
• Start-up ECT is not greater than 14°F (8°C), but greater than start-up IAT.
• Start-up IAT is 40-86°F (4-30°C).
• Start-up IAT is not greater than 4°F (2°C), but greater than start-up ECT.
• Fuel tank level 15-85 percent.
• BARO is greater than 75 kPa.
• Fuel tank pressure NOT -1.5 to 1.5 in. H2O when ignition is turned on.

Or

• No IAT, MAP, ODM, or TP sensor DTCs set.
• DTC P0442 test passed.
• Normal EVAP system operation is commanded (EVAP vent solenoid open, EVAP purge solenoid normal).
• Fuel tank pressure less than -10 in. H2O.
• Listed conditions present for 30 seconds.