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Engine Retarder Mode
OEM
Description:
When the driver is operating an engine retarder with
the cruise control switch “On” and steps on the service
brake, two customer selectable modes of operation are
available, Coast and Latch. One additional Manual mode
is available, which does not require the cruise switch to
be in the “On” position and operates like a retarder on a
mechanically governed engine.
Coast Mode:
On
Applied
Off
Released
Service
Brake
Engine
Retarder
Coast Mode engages the engine retarder when the
driver presses (applies) the service brake pedal. When
the pedal is released, the retarder disengages.
Latch Mode:
On
Applied
Released
Service
Brake
Engine
Retarder
Latch Mode engages the retarder when the driver
presses (applies) the service brake. The driver can then
release the service brake and the retarder will remain
engaged until another input, such as depressing the
throttle or clutch, engine RPM drops below 800 RPM, or
the retarder is turned off, is supplied.
Manual Mode does not require the Cruise Control
Switch to be in the “On” position. In Manual Mode
the engine retarder will activate anytime the Retarder
Switch is “On”, engine RPM is above 800 RPM and the
engine is not being fueled.
Available:
All electronically controlled on-highway engines
covered in this handbook
Cruise Control Parameters