Mack Granite GU Series, Operator'S Handbook Manual

Page: 176 / 317

OPERATION 165
Enhanced Stability Program
Enhanced Stability Program (ESP) is an optional system that uses existing
ABS and ATC components with the addition of electronic sensors and brake
valves. The system will automatically apply and release individual brakes
to improve vehicle control when extreme conditions are detected. In the
event a pending rollover situation is sensed, the system applies all brakes to
reduce vehicle speed to lessen the possibility of rollover. Please refer to the
applicable vendor manual for more information.
Precautions When Installing Electrical Equipment
Connecting electrically powered or electrically controlled equipment to the
vehicle may cause interference with other vehicle components (e.g., the ABS
system). The amount of interference will depend on the operating frequency
of any new signals and the degree to which transient signals are coupled
into the vehicle system.
Note:
Whenever new electrical equipment is installed, it is the obligation of the
installer to ensure that the new equipment does not interfere with the proper operation
of all other electrical systems on the vehicle.
If new electrical equipment is installed, a vehicle checkout procedure should
be performed.
1. Perform the checkout procedure under the following conditions:
• Engine running
• Brake system air pressure in operating range
• Vehicle stationary
• Brake pedal fully depressed
2. Operate the new equipment under all starting, running and shutdown
conditions.
3. Listen for signs of air exhausting from ABS modulator valves (which is an
indication of an interference condition).
4. Correct all interference conditions before operating the vehicle.
Note: The center pin of the standard seven-pin trailer electrical connector has been
standardized as the dedicated connection for uninterrupted power for trailer ABS. This
pin is always hot when the tractor ignition is turned on.