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 necessary. If the driver doesn't understand how the warning system works, the driver may not be able to utilize the advantage of the advance warning system to pull over appropriately.
The engine will begin a warning and derate and/or shutdown process if the engine coolant temperature, coolant level, engine oil pressure, or exhaust aftertreatment system (ATS) reach preset levels. On some engines, the warning process will begin when the engine oil temperature, engine coolant temperature, or the intake air temperature reach preset levels. Detroit™ engines may 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 for the warning and shutdown modes associated with the ATS.
Electronic engine protection can be specified as either SHUTDOWN or WARNING and DERATE.
Warning: When the STOP engine or CHECK engine lamp 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 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 while in derate mode. The driver has 30 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, turn the ignition switch to OFF for at least five seconds, then restart the engine. 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 Lamps
Do not operate the vehicle further until the problem causing the shutdown has been corrected.
Some vehicles may have a shutdown override switch, which can be used to momentarily override the shutdown sequence. This switch resets the shutdown timer, restoring power to the level before the derate. The switch must be pressed again after five seconds to obtain a subsequent override. See Fig..
Fig. 2, Shutdown Override Switch
Notice: When the derate process begins, immediately get the vehicle serviced in order to prevent severe damage to the engine.
Detroit engines may begin a warning and derate process if water is detected in the fuel, or if engine coolant temperature is high. In WARNING and DERATE mode, the CHECK engine, STOP engine, or MIL lamp will illuminate to indicate an engine problem that requires service and the engine controls will begin a derate of engine output. Continuing to run the engine while it is in derate mode could cause severe damage to the engine.