Basic advancement of the PCM power control selects the basic angle of ignition advance from his memory, based on speed of engine, load, position the throat papalote and antifreeze in the engine temperature. Relevant signals: a) flow/pressure (Sensor MAF, VAF or MAP) intake manifold or air mass b) speed of motor (Sensor of position of the crankshaft Crankshaft Position Sensor) c) throat in the throttle body (Sensor TPS) position d) antifreeze (Coolant Sensor) Motor temperature (on some vehicles Ford is the temperature of the cylinder head or head) setting made the Control corrective of advance ignition advance Control corrective end to the current time of ignition. The following correction factors do not found in all vehicles. Initial engine warm-up phase correction the tempo of ignition is advanced to improve driveability when the antifreeze temperature is low. On some models of engines, this correction changes the angle of advance in accordance with the mass flow of air (intake manifold pressure) and can advance is approximately 15 weather extremely cold.
Correction for high temperatures to prevent detonation, cascabeleos and overheating, the ignition time is slowed when the antifreeze temperature is too high. The on time can be delayed approximately 5 due to this correction. Correction for run minimum stable when the speed of the engine during the idling has fluctuated away from the target speed, the PCM adjusts the ignition time to stabilize the engine speed. The PCM is constantly calculating the average speed of the motor. If the engine speed falls below the target speed, the PCM advances the time of on to a default angle. If the engine speed rises above the speed goal, the PCM retards the ignition to a default angle time. This correction does not run when the engine exceeds a predetermined speed. On some models of engines, the advance angle changes depending on whether the air conditioner is turned on.