•  The PCM controls fuel injection timing by moving the position of the control sleeve that drives the electronic governor mounted to the injection pump and determines the end of fuel injection.

•  The PCM calculates the target fuel injection amount based on input signals, and determines the target control sleeve position according to this calculation.

•  The PCM drives the electronic governor with the CS sensor so that the actual detected control sleeve position approaches the target control sleeve position.

•  The basic fuel injection amount is pre‐programmed into the PCM and is determined by engine speed and the amount that the accelerator pedal is depressed.

•  The fuel injection amount at engine start is pre‐programmed into the PCM and is determined by engine speed and engine coolant temperature.

•  The basic fuel injection amount at idle is determined by performing feedback correction of the actual engine speed to approach the target idle speed programmed into the PCM for the injection amount required based on the basic fuel injection amount, cylinder and differential learning, and idle load learning.

•  By accounting for correction values of various loads, such as A/C operation at idle, idle load learning maintains idle speed stability that accompanies load modifies.

•  Because there is mechanical variation in the injection pump and the engine, with only a uniform injection amount programmed into the PCM, there will be differences in engine speed in each vehicle.

•  Differential learning maintains stable idle speed by pre‐learning corrected fuel amounts according to the variation of each vehicle and accounting for this in the basic fuel injection amount.

•  Cylinder learning stabilizes idle speed by detecting the variation in fuel injection amount of each cylinder that results from combinations of injection pumps and injection nozzles from the change in gear speed of the crankshaft and correcting the injection amount suitable to each cylinder.

•  Maximum fuel injection amount is the maximum value for the basic fuel injection amount at idle and the basic fuel injection amount at normal operation, and is determined by intake air temperature, atmospheric pressure, and engine speed.

•  The target control sleeve position is calculated from the fuel injection amount calculated in the PCM.

•  Performs feedback control of the duty signal so that the actual control sleeve position inputted from the CS sensor approaches the target control sleeve position.