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Home >> Isuzu >> 1989 >> I-Mark LS >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Theory/Operation - CARBURETED >> Computerized Engine Control >> Input Devices >> Altitude Sensing Switch (I-Mark)

Altitude Sensing Switch (I-Mark)

Is a bellows and microswitch combination which moves in response to atmospheric pressure changes. At an atmospheric pressure lower than specified, bellows expand to turn on microswitch, supplying current to Idle-Up Solenoid Valve and ECM.

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