October 7, 200322 yr PO446 EVAP System Vent Control Low Input The Evap valve gets 12v thru a relay to the solenoid. The ECM provides ground to the other side of the coil to control purge vapors. This sounds like you either have No 12v from the relay, open coil on the valve, or an open wire. On the 2000 up it's in the rear under the gas filler tube. I don't know where the '98 is. Hope this helps you find the problem.
October 7, 200322 yr P0441 or more commonly P0442 is for a loose gas cap. This is a running 'algorythm' test for pressure/vacuum changes in the tank to ensure they CAN be measured, If they can't then the above is posted. P0446 is an electrical check at the ECM to detect for 12v present thru the vent valve coil. Without the 12v, the ecm can 'ground' this side of the coil to activate the vent, but without 12v on the other side, the vent will not open. I would 1st check for 12v present at the vent coil connector with the car running, then take my further diagnosis from there.
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