Circuit Description
The EVAP control system checks for conditions that cause the EVAP system to
purge continuously by commanding the canister vent solenoid ON and the EVAP canister
purge OFF, or the canister vent solenoid closed and the purge valve to 0 percent
duty cycle. If the fuel tank vacuum level increases during the Service Bay Test, a
continuous purge flow condition is indicated. A stuck open or leaking purge solenoid
will cause the DTC P1441 to set.
Conditions for Setting the DTC
A continuous purge flow condition is detected when the Service Bay Test is run
using the scan tool.
| • | DTCs P0105, P0107, P0108, P0112, P0113, P0117, P0118, P0125, P0452, P0453,
and P0500 are not set. |
| • | Start-up ECT and IAT are both between 5-32°C (41-90°F). |
| • | The IAT and ECT are within 10 degrees of each other at start-up. |
| • | The barometric pressure is greater than 80.8 kPa. |
| • | The fuel tank level is between 15-85 percent. |
| • | A continuous purge flow condition is detected during the diagnostic test,
or there is greater than 3 inches H2O vacuum. |
