Circuit Description
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic monitors the evaporative emission (EVAP) system for faults in the EVAP vent solenoid electrical circuit. Battery positive voltage is supplied directly to the 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 low voltage on the control circuit when the driver is commanded OFF, 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.
DTC P0498
| Control Module Command | EVAP Canister Vent Valve Position |
|---|---|
| ON | CLOSED |
| OFF | OPEN |