Idle

This is a CLOSED LOOP mode.

With engine idling at operating temperature, the 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 sensor 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).