Emission Control Systems: Specifications

Canister purge control valve opening vacuum 180-220 mmHg (7.1-8.7 in.Hg)
Evaporative emission check and relief valve:
Opening pressure from fuel tank to canister 20-40 mmHg (0.8-1.6 in.Hg)
Opening vacuum from air cleaner to fuel tank 5-20 mmHg (0.2-0.8 in.Hg)
EGR thermal vacuum valve opening temperature 46~-54~C (115~-129~F)
EGR valve operating vacuum:
Starting 40 mmHg (1.6 in.Hg)
Fully open 100 mmHg (3.9 in.Hg)
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]
Air pump relief valve operating pressure (at 7 L/min air flow) 202±55 mmHg (8.0±2)
Thermo sensor operating temperature (air cleaner):
Starting 38~C (100~F)
Fully open 44~C (111~F)
Vacuum motor (air cleaner):
Opening vacuum 60±20 mmHg (2.4±0.8 in.Hg)
Full open vacuum 100±20 mmHg (3.9±0.8 in.Hg)
Idle compensator operating temperature (air cleaner):
Starting 46~C (115~F)
Fully opened 52~C (126~F)

[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).