Pickup 4WD L4-2559cc 2.6L SOHC (4ZE1) (1988)
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A/C Signal: Description and Operation
On models equipped with air conditioning, the A/C signal informs the ECM that the A/C switch is turned "ON" and the A/C pressure cycling switch is
closed. With this input, the ECM adjusts engine idle speed as needed to maintain a smooth idle.
