New (To Me) Information For 2001 Only Camry And Solara Vehicles.
Read a copy of Toyota TSB (technical service bulletin) #EG010-01 (engine group). The TSBs are for Toyota technicians and not written for DIYers.
You’ll need to see if you’ve got the old part number ECM (Engine Control Module) or the new one. I guess you can start by checking your VIN as their was a production (assembly line) change-over. Try checking the ECM part number.
If it’s your ECM then working on the EVAP system isn’t going to fix it.
Good Luck,
CSA