Vehicle System Testing and Adjusting 44
Delayed Engine Shutdown System
Operation
The delayed engine shutdown system will shut the
engine down if no proper action is taken by the
operator. This system makes use of the engine oil
pressure switch, transmission oil temperature switch
and water (coolant) temperature sensor to get
the required truck condition.
If an engine damaging condition arises, such as too
much oil pressure drop, this system will alert the
operator by warning MIL Lamp.
If the operator ignores this warning and does not
shutdown the engine within thirty seconds, this
delayed engine shutdown system will interrupt the
fuel supply to the engine, thereby saving the engine
from the critical damage.
1. Low engine oil pressure
The warning MIL lamp will turn on when the oil
pressure drops to approximately 28KPa
(4 psi) and the delayed engine shutdown
System will interrupt the fuel supply to the engine
after thirty seconds.
2. Hot engine coolant
The warning MIL lamp will turn on when the
coolant temperature reaches approximately
115℃(239℉) and the delayed engine
shutdown system will interrupt the fuel supply to the
engine after thirty seconds.
3. Hot transmission oil
The warning MIL lamp will turn on
when the transmission oil temperature
reaches approximately 125℃(257℉) and the
delayed engine shutdown system will
interrupt the fuel supply to the engine after thirty
seconds.
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