Group 28 Design and Function
Power Take-Off (PTO)
PTO functions are controlled by the VECU through the
cruise control switch. Basic or optional PTO parameters
can be programmed with the VCADS Pro tool.
Ignition Switch
Ignition switch positions are recognized by the VECU,
which transfers the ignition switch position information to
the EECU.
Idle Shut-Down
Timed engine shut-off can be controlled by the VECU as
a customer option. Idle shut-down time can be pro-
grammed with the VCADS Pro tool.
Engine Brake
The control for the engine brake (including the exhaust
pressure governor [EPG] and compression brake [VCB],
if installed) are monitored by the VECU. At the request
of the ABS ECU, the VECU can de-activate the engine
brake.
Windshield Wipers
Windshield wiper function on the VN and VHD (with
Volvo engine) is controlled by the VECU using signals
received from the wiper switch.
Calibration Number
The calibration number (K factor) is a measurement of
“Drivetrain Constant Pulses per Mile” and is used by the
VECU to determine vehicle speed and distance traveled.
The calibration number is calculated by multiplying “tire
revolutions per mile” x “rear axle ratio” x “number of
teeth on the transmission output shaft chopper wheel.”
The calibration number is programmed into the VECU
using the VCADS Pro tool.
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