DTC P0449: EVAP Canister Vent Solenoid Control Circuit: Description
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
An ignition voltage is supplied to the evaporative emission (EVAP) canister vent valve. The control module grounds the EVAP canister vent valve control circuit to close the valve by means of an internal switch called a driver. The scan tool displays the commanded state of the EVAP canister vent valve as ON or OFF. The control module monitors the status of the driver. If the control module detects an incorrect voltage for the commanded state of the driver, this DTC sets.
The following table illustrates the relationship between the ON and OFF states, and the OPEN or CLOSED states of the EVAP canister vent valve. See EVAP CANISTER VENT VALVE STATES .
EVAP CANISTER VENT VALVE STATES
| Control Module Command | EVAP Canister Vent Valve Position |
|---|---|
| ON | CLOSED |
| OFF | OPEN |