Emission Control Systems: Specifications
Canister purge control valve opening vacuum 90±20 mmHg (3.7 inHg)
Evaporative emission check and relief valve:
Opening pressure from fuel tank to canister 40 mmHg (1.6 inHg)
Opening vacuum from air cleaner to fuel tank 20 mmHg (0.6 inHg)
EGR thermal vacuum valve opening temperature 50~C (122~F)
Back pressure transducer control pressure:
Off less than or equal to 53.5 mmAq (2.1 inAq) [1]
On more than or equal to 81.5 mmAq (3.2 inAq) [1]
[1] mmAq (inAq) is used to represent pressure or vacuum measured by the height of a column of water which it supports. This convention is used when pressure differentials are too small to accurately measure using millimeters or inches of Mercury (Hg).