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2007 Saturn Ion secondary air injection system pressure switch?
Wiki User
∙ 12y ago
the secondary air injection pressure sensor is built into the air injection control valve located at the rear of the engine compartment just above the exhuast manifold, it reports the air pressure in the air injection line to the ecm, the ecm compares this pressure to barometric pressure to test the air injection system, the test has 3 phases, 1st the pump is turned on with the control valve off and the ecm should see approx +20 kpa above baro sensor, phase 2 pump on, valve open, the ecm should see roughly +10kpa above baro, and phase 3 the pump and valve are both off and should show the same pressure as baro.the air inhection should only operate on a cold engine for roughly 60 seconds.
Wiki User
∙ 12y ago
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