Tracker 4WD L4-1.6L VIN 6 (1998)
A/C Signal: Description and Operation
A/C Idle-Up Signal
The A/C amplifier provides an A/C idle-up signal to the Powertrain Control Module (PCM) when the A/C compressor clutch is in operation. The
PCM uses the A/C idle-up signal in order to modify the engine idle speed. The PCM will signal the Idle Air Control (IAC) valve to open the air
passage in the throttle body. Opening the IAC air passage slightly will increase the engine speed in order to prevent a rough idle or a stalling
condition.
