Engine Protection—Warning and Shutdown
|
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. |
If the engine coolant temperature, the coolant level, the engine oil pressure, or exhaust aftertreatment system (on some engines, the engine oil temperature, or the intake air temperature) reach preset levels, the engine will begin a warning and shutdown process. See the engine manufacturer's operation manual for specific details for your vehicle. See Chapter 11 in this manual, for the warning and shutdown modes associated with the exhaust aftertreatment system.
Electronic engine protection is programable as an option, and can be specified as the following; DERATE, and SHUTDOWN mode (factory default), WARNING mode, or OFF mode.
In the DERATE and SHUTDOWN mode, the red stop-engine light will illuminate when the problem is serious enough to reduce the power or speed. The engine power will ramp down, then shut down, if the problem continues. The driver has 30 seconds after the stop-engine light 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 5 seconds, then back ON. This action can be repeated until the vehicle is safely off the road. See Fig..
-
Malfunction Indicator Lamp (MIL)
-
CHECK Engine Lamp
-
STOP Engine Lamp
Fig. 1, Engine Warning Lamps
Some vehicles may have a shutdown-override switch, which may be used to override the shutdown sequence. This switch resets the shutdown timer, restoring power to the the level before the derate was initiated. 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 until the problem has been corrected. See Fig..
Fig. 2, Shutdown Override Switch
If the engine protection parameters are set to WARNING, it warns the driver; the amber, check-engine light will flash, and a buzzer will sound. The engine electronics log the event for diagnostic purposes. The check-engine light will go out if the problem stops.
If the engine protection parameters are set to OFF mode, the individual sensor indicator lights will illuminate if a problem exists, but no shutdown action will be started, and the event will not be recorded.