Engine Protection—Warning
and Shutdown
NOTE: The engine warning and shutdown sys-
tem is present on EPA07-compliant and newer
vehicles.
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 after-
treatment system (ATS) reach preset levels. On
some engines, the warning process will begin when
the engine oil temperature, engine coolant tempera-
ture, or the intake air temperature reach preset lev-
els. 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
Chapter 12 for
the warning and shutdown modes associated with
the ATS.
Electronic engine protection can be specified as ei-
ther 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. 11.1. 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 sec-
onds, then restart the engine. Repeat this action until
the vehicle is safely off the road.
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 shut-
down 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. 11.2.
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 pro-
cess if water is detected in the fuel, or for high en-
gine coolant temperature. In WARNING and DER-
ATE mode, the CHECK engine, STOP engine, or MIL
07/09/2009 f611036
123
CHECK
STOP
1. Malfunction Indicator Lamp (MIL)
2. CHECK Engine Lamp
3. STOP Engine Lamp
Fig. 11.1, Engine Warning Lamps
ENG
SHDN
f61090002/26/2007
OVRD
Fig. 11.2, Shutdown Override Switch
Optional Engine Systems
11.1
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