Ignition Timing Control: Notes
NOTE:
For other inputs, see INPUT DEVICES
under COMPUTERIZED ENGINE CONTROLS.
A microcomputer in the PCM controls ignition timing according to engine speed and vacuum within the intake manifold. Engine speed and vacuum are transmitted to PCM by signals from a crank sensor, cylinder (CYL) sensor, TDC sensor, throttle position sensor, coolant temperature sensor, knock sensor(s), MAF sensor, and MAP sensor.
The PCM calculates ignition timing for each engine speed, manifold pressure, and coolant temperature. When these conditions have been processed, the PCM sends signals to the igniter unit to control ignition timing.