Paccar PX 8 Operator's Manual - page 39
of
94
Operating Instructions
PACCAR
Y53-1030A 12/09
– 33 –
The ECM then electronically enables or disables the engine
brakes.
Engine brakes cannot be enabled:
• When cruise control is active and the Engine
brakes in Cruise Control feature is turned off.
• When engine speed goes below 850 rpm.
• When the Engine Computer recognizes a system
problem.
The throttle sensor is part of the accelerator pedal assembly
located in the cab and will deactivate the engine brakes when
the acceleration pedal is depressed.