PEC 013
Page
38
of
71
12/20/13
inactive. It behaves the same way as the Manual M
ode described in “Standard
Features.
”
Coast Mode allows the engine to provide braking when the PACCAR Engine
Brake ON/OFF switch is ON, the Cruise Control is ON and inactive, and the
service brake is applied. The PACCAR Engine Brake will de-activate in Coast
Mode when the service brake pedal is released or cruise control is activated.
Latch Mode allows the engine to provide braking when the PACCAR Engine
Brake ON/OFF switch is ON, cruise control is ON and inactive, and the service
brake pedal is applied. Latch Mode will continue to provide braking after the
service brake pedal is released and will de-activate when the accelerator pedal
is applied or cruise control is active.
Auto-Retard allows the engine to provide braking when the PACCAR Engine Brake
ON/OFF switch is ON, cruise control is ON and active and the vehicle speed
exceeds the cruise control set speed plus the Downhill Speed Control (DSC) offset
speed. Auto-Retard can be programmed independently of all other PACCAR Engine
Brake parameters. Auto-Retard will de-activate when the vehicle speed just above or
equal to the cruise control set speed or when cruise control is inactive. A large offset
will reduce engine brake usage, while a lower offset will increase engine brake
usage. A lower offset is suggested for steep terrain.
The Downhill Speed Limiter allows the engine to provide braking when the PACCAR
Engine Brake ON/OFF switch is ON and the vehicle speed exceeds the maximum
vehicle speed plus the “DSL target vehicle speed offset.” The Downhill Speed Limiter
will function independently of all other PACCAR Engine Brake parameters. In Manual
Mode the Downhill Speed Limiter will activate if the accelerat
or pedal is “dead” (over
set vehicle speed) and the vehicle speed is over the DSL plus set vehicle speed. If
while in Manual Mode the PACCAR Engine Brake is already active and the operator
has an event where the vehicle speed > max vehicle speed + DSL offset speed, then
the PACCAR Engine Brake power will be increased. In the case that the PACCAR
Engine Brake power is already on high, the Downhill Speed Limiter will have no
effect on the PACCAR Engine Brake. Downhill Speed Limiter will de-activate when
the vehicle speed is reduced to the maximum vehicle speed.
Orderable Feature & Options
Feature
Sales Code
Description
Enable MX Retarder
2092075
Auto Retard
Enable MX Retarder
2092077
Enable Retarder Downhill Speed
Limiter
Disable MX Retarder
2092078
Disable Retarder
MX Retarder State Cruise Control On
2092027
Manual Mode Engine Parameter
MX Retarder State Cruise Control On
2092028
Coast Mode Engine Parameter
MX Retarder State Cruise Control On
2092029
Latch Mode Engine Parameter