EVAP Canister (LS400)
Visually inspect EVAP canister and hoses for cracks and damage. Check for clogged filter, and stuck check valve and diaphragm. Disconnect hoses from EVAP canister ports. See Fig 1. Replace EVAP canister if it does not function as follows:
- Hold port "B" closed and apply .26 psi of compressed air to port "A" on top of canister. Air should flow from port "D".
- Plug port "B" and "D" and apply .26 psi of compressed air to port "A". Air should not flow from port "C".
- Connect a vacuum pump to port "B". Apply .62 in. Hg vacuum. With port "C" plugged, vacuum should hold. With port "C" unplugged, vacuum should release.
- Connect a vacuum pump to port "A". Apply .39 in. Hg vacuum. With port "C" plugged, air should flow into port "B".