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:
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:
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
Range:
Advantages:
The Coast and Latch settings of the Engine Retarder Mode can offer increased driver comfort and reduce driver fatigue.
Disadvantages:
None
Recommendations:
This is a driver preference feature. Program to the setting the driver prefers.