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A/C Signal: Description and Operation
The fuel
control unit is signaled by the A/C control unit whenever the A/C is turned on. The fuel control unit then responds by modifying the duty cycle to the idle stabilizer valve, increasing the
idle speed by approximately 100 rpm. This is to ensure a smooth idle with the additional load of the A/C compressor, as well as to ensure more efficient A/C operation when the engine is idling.