Idle/Cruise

This is a CLOSED LOOP mode.

With engine at idle or cruise, 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 (O2S)

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.

- Under certain conditions, enter a variable idle speed strategy.