Operation and maintenance manual

QSB4.5 and QSB6.7 Electronic Controlled Fuel System
Section 1 - Operating Instructions Page 1-9
Engine Protection System
The engines are equipped with an engine protection
system. The system monitors critical engine temperatures
and pressures and will log diagnostic faults when an over
or under normal operation condition occurs. If an out-of-
range condition exists and engine derate action is to be
initiated, the operator will be alerted by an in-cab
WARNING lamp. The WARNING lamp will blink or flash
when out-of-range conditions continue to worsen. When
the red STOP lamp is illuminated, the driver must pull to
the side of the work area, when it is safe to do so, to
reduce the possibility of engine damage.
NOTE: Engine power and speed will be gradually
reduced, depending on the level of severity of the
observed condition. The engine protection system will not
shutdown the engine unless the engine protection shut
down feature has been enabled.
Engine Protection Shutdown
This feature automatically shuts off the engine when the
temperature, pressure, and coolant level sensors indicate
the engine is operating over or under normal operating
conditions.
The red STOP lamp in the cab will flash for 30 seconds
prior to shut down to alert the driver.
Engine Protection Shutdown Manual Override
This feature allows the operator to override a pending
engine shutdown. Prior to engine shutdown, the red
STOP lamp will flash for 30 seconds to notify the operator
that the engine is about to shut down. The operator can
override the engine shut down through use of an OEM
switch, such as the clutch switch.
If the vehicle is not equipped with a clutch switch, then
the OEM will provide a dash-mounted switch marked as
the ENGINE PROTECTION SHUTDOWN OVERRIDE
switch. When the operator triggers this switch while the
red lamp is flashing, a timer within the ECM will reset and
allow the engine to operate for an additional 30 seconds
before engine shutdown occurs. Each time the operator
triggers the override switch, the timer within the ECM is
reset, allowing the engine to operate for an additional 30
seconds.