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Home >> Toyota >> 1991 >> 4Runner 2D Utility, 3.0 V, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> A/C Switch

A/C Switch

When the air conditioner is turned on, the ECU monitors the signal that turns on the compressor clutch. ECU uses this signal for controlling idle speed during A/C operation.