Engine Warm-Up Mode

ENGINE WARM-UP MODE

This is an OPEN LOOP mode. The following inputs are received by the PCM:
- Engine coolant temperature
- Manifold Absolute Pressure (MAP)
- Intake air temperature (IAT)
- Crankshaft position (engine speed)
- Camshaft position
- Knock sensor
- Throttle position
- A/C switch
- Battery voltage
- Vehicle speed
- Speed control
- 4-O2 sensors
- All diagnostics

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.