Mack TerraPro LEU 2010, Operator'S Handbook Manual

Page: 140 / 225

OPERATION 129
• Changes to steer axle and/or drive axle track width
• Changing the front and/or rear brake drums to drums having a different
flange thickness
Tire Size Calibration
The ECU requires a precise rolling circumference ratio between the front steer
axle and the rear drive axles for optimum performance of the system. For
this reason, the system continuously calculates the precise ratio and stores
the information in the ECU memory.
CAUTION
Effectiveness of the RSA system relies on the accuracy of the reported vehicle
speed. If major changes to tire sizes are made, such that changes to the vehicle
speedometer/odometer settings are required, the Advanced EC-60™ ECU must be
reprogrammed with the new values by a qualified technician.
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.