Idle

This is a CLOSED LOOP mode.

With engine idling at operating temperature, the Powertrain Control Module (PCM) receives inputs from:
^ Air Conditioning Control Position
^ Battery voltage
^ Camshaft position (CMP) sensor
^ Engine coolant temperature (ECT) sensor
^ Manifold Absolute Pressure (MAP) sensor
^ Intake air temperature (IAT) sensor
^ Crankshaft position (CKP) sensor
^ Throttle Position Sensor (TPS)
^ Heated oxygen sensor (HO2S)

Based on these inputs the PCM will:
^ Apply voltage to the injectors. The PCM then controls injection sequence and pulse width by switching individual injector ground paths on and off.
^ Monitor oxygen sensors and fine tune air/fuel ratio by varying injector pulse width.
^ Adjust engine idle speed through the IAC motor.
^ Adjust ignition timing.
^ Operate A/C Compressor Clutch relay (if selected).