Circuit Description

An ignition voltage is supplied to the Evaporative Emission (EVAP) canister vent valve. The Powertrain Control Module (PCM) 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 PCM monitors the status of the driver. If the PCM 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 PCM TO EVAP CANISTER VENT VALVE RELATIONSHIP  table.