System Operational Test

Evaporative Emission Control System Inspection:

1. Disconnect the red striped vacuum hose from the throttle body, connect a hand vacuum pump to the hose and plug the nipple.
2. While the engine is cold (coolant temperature less than 60 degrees C or 140 degrees F) allow the engine to idle and apply 400 mm Hg or 15.7 in. Hg of vacuum and verify that vacuum holds.
3. Increase engine speed to 3,000 rpm, apply 400 Hg or 15.7 in. Hg of vacuum and verify that vacuum holds.
4. Allow the engine to warm up (engine coolant temperature greater than 70 degrees C or 158 degrees F).
5. With the engine operating at idle apply 400 mm Hg or 15.7 in. Hg of vacuum and verify that vacuum holds.
6. Within three minutes of engine start increase engine speed to 3,000 rpm. Attempt to apply vacuum and verify that vacuum leaks.
7. After more than three minutes have elapsed since engine start increase engine speed to 3,000 rpm and apply 53 kPa Hg or 15.3 in. Hg and verify that vacuum is held momentarily and then leaks. Note that vacuum will leak continuously if altitude is greater than 2,200 m or 7,200 ft. or if intake air temperature is greater than 50 degrees C or 122 degrees F.