PEC017
5/3/2018 Page 22 of 105
Fast Idle Control (FIC)
Overview
The Fast Idle Control (FIC) functionality allows adjustment of engine idle speed
within preprogrammable limits. This allows the driver to adapt to changing engine
speed requirements. For example, the driver can raise engine speed for faster
engine warm-up on a cold day. Raising the idle can improve HVAC performance in
extreme conditions while parked, and may be helpful for other service operations
such as charging the batteries or air system. Fleet managers may find that altering
some of the FIC settings may yield better fuel economy when the application
requires extended idle operations. The FIC module allows a fleet owner to set limits
in order to enhance overall operating economy. FIC is a standard feature of the
engine, but can be disabled to ensure that engine idle speed cannot be altered.
The default FIC settings are useful for the majority of applications, so modifications
of the default settings typically are not necessary. Before changing the default
parameters, it is strongly recommended to consult the customer and/or body builder
to determine the specific vehicle application.
Standard Feature
FIC
FIC becomes active and allows the driver to control the engine speed with the
Set/Accel and Resume/Decel switches when all of the following conditions are met:
The Cruise Control switch is in the ON position
The vehicle is stationary
The transmission is in neutral
The parking brake is set
FIC may be enabled or disabled with Enable Fast Idle Control (N071) and the
maximum FIC engine speed can be limited by Maximum Engine Speed in Fast Idle
Control (N072).
FIC will be overruled if the accelerator pedal request exceeds the FIC request, at
which point the accelerator pedal will control engine speed. FIC will automatically
deactivate if the clutch pedal or the service brake pedal are depressed.
The Set/Accel switch allows the driver to increase the engine speed. When FIC is
active and the Set/Accel switch is pressed, the engine speed will increase by Engine
Speed Ramp-Up w/ Set/Accel (N107). When FIC is active and the Set/Accel switch
is pressed and held, the engine speed will increase at Engine Speed Increase w/
Set/Accel (N103).
The Resume/Decel switch allows the driver to decrease the engine speed. When FIC
is active and the Resume/Decel switch is pressed, the engine speed will decrease by
Engine Speed Ramp-down w/ Res/Decel (N105). When FIC is active and the
Resume/Decel switch is pressed and held, the engine speed will decrease at Engine
Speed Decrease w/ Res/Decel (N104).
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