Engine Protection—Warning and Shutdown
The driver should be familiar with the vehicle warning system in order to bring the vehicle to a safe stop if the engine malfunctions. If the driver doesn't understand how the warning system works, an engine shutdown could occur.
The engine will begin a warning and shutdown process if the engine coolant temperature, coolant level, engine oil pressure, or exhaust aftertreatment system (ATS) reach preset levels. On some engines, the engine will also begin the warning and shutdown process when the engine oil temperature or the intake air temperature reach preset levels. Detroit Diesel engines will also begin the warning and shutdown process if water is detected in the fuel.
See the engine manufacturer's operation manual for specific details for your vehicle.
See Greenhouse Gas Emissions and Fuel Consumption Standards in this manual for the warning and shutdown modes associated with the ATS.
Electronic engine protection is programmable as an option, and can be specified as the following: DERATE and SHUTDOWN mode (factory default), WARNING mode, or OFF mode.
Warning: When the red STOP engine or engine protection light illuminates, most engines are programmed to shut down automatically within 30 seconds. The driver must immediately move the vehicle to a safe location at the side of the road to prevent causing a hazardous situation that could cause bodily injury, property damage, or severe damage to the engine.
In the DERATE and SHUTDOWN mode, the red STOP engine lamp will illuminate when the problem is serious enough to reduce power or speed. See Fig.. Engine power will ramp down, then the engine will shut down if the problem continues. The driver has 30 seconds or 60 seconds (depending on the critical fault type) after the STOP engine lamp illuminates to move the vehicle safely off the road. If the vehicle cannot be moved to a safe location within that time, the engine can be restarted by turning the ignition switch to the OFF position for at least five seconds, then back ON. Repeat this action until the vehicle is safely off the road.
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Malfunction Indicator Lamp (MIL)
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CHECK Engine Lamp
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STOP Engine Lamp
Fig. 1, Engine Warning Lights
Some vehicles may have a shutdown-override switch, which may be used to momentarily override the shutdown sequence. See Fig.. This switch resets the shutdown timer, restoring power to the level before the derate for another 30 or 60 seconds (depending on the critical fault type). The switch must be pressed again after 5 seconds to obtain a subsequent override. It can be used to move the vehicle to a safe stopping area. Do not operate the vehicle further until the problem has been corrected.
If the engine protection parameters are set to WARNING mode, the amber CHECK engine lamp will flash and a buzzer will sound. The engine electronics log the event for diagnostic purposes. The CHECK engine lamp will go out if the problem stops.
If the engine protection parameters are set to OFF mode, the individual sensor indicator lamps will illuminate if a problem exists, but no shutdown action will be started and the event will not be recorded.
