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).