Engine Warm Up

This is an OPEN LOOP mode. The following inputs are received by the PCM:
- Engine coolant temperature
- Manifold absolute pressure
- Engine speed (crankshaft position sensor)
- Throttle position
- A/C switch
- Battery voltage

The PCM adjusts injector pulse width and controls injector synchronization by turning the individual ground paths to the injectors On and Off.

The PCM adjusts ignition timing and engine idle speed. Engine idle speed is adjusted through the idle air control motor.