13E-16
2.6 Warm-up acceleration function
• The warm-up acceleration function increases engine warm-up by varying the engine’s idling speed in accordance
with the engine’s coolant temperature. It can operate either automatically or manually. Selection is made using the
idling speed adjustment potentiometer.
2.7 Starter continuous energizing preventing function
• This function is provided to prevent starter over-run.
• If the starter operates for longer than a predetermined period following engine startup, the Engine electronic con-
trol unit deems that it has been energized continuously for too long. The Engine electronic control unit then stops
the flow of current to the starter and starter relay, thereby preventing the starter from seizing.
• If the engine electronic control unit determines, based on the engine speed signal it receives, that the engine has
run at or above the specified speed for longer than the specified time period after start-up, the unit trips the safety
relay open.
(1) Operation mode
2.8 Preheating function
• This preheating function aims to enhance the engine start up when the engine coolant is low in cold weather or
temperature.
(1) Pre-glow and After-glow
The preheating is operated with a pre-
glow before the engine starts and an af-
ter-glow after the engine starts. They are
controlled by the starter switch (S termi-
nal) signal, engine water temperature
signal and the engine rotation signal.
Water temperature sensor
Accelerator pedal position sensor
Idling speed adjustment potentiometer
Engine electronic control unitInput signals
Comparison operations
Target injection quantity
Idling speed control
Output signals
STRUCTURE AND OPERATION
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