American Expedition Vehicles ProCal Module User Guide - Manual (Page 3)

2/5/2009 Page 3 of 10 AEV30200AA
Tire Size Mode
Description: This mode allows the user to adjust the tire size setting on the vehicle. This will ensure
proper speedometer reading, odometer function, and automatic transmission shift points. In order to
program the proper tire size, a measurement of the front tire will need to be taken on the vehicle under
normal load and air pressure rounded to the nearest quarter inch (1/4”). Do not use the manufacturers
listed tire size.
Notes: There are two tire size modes, the first mode is for tires that are 24.00 inches to 38.75 inches in
diameter and the second is for tires that are 39.00 inches to 53.75 inches in diameter. Begin by setting
the first three switches to select the proper mode.
Procedure: Consult the Quick Reference Guide and set the DIP switches accordingly. With the engine off
and ignition on, plug the module into the OBD port and wait for the horn to sound. If the horn does not
sound, consult the troubleshooting section of these instructions. Do not attempt to program tire size
while the engine is running. It is important to cycle the key OFF after any successful programming
before starting/running the vehicle.
If the vehicle’s speedometer does not seem to function after a successful programming an error has
occurred in the vehicle network. If at any time the vehicle modules do not agree on a tire size coefficient
the speedometer will cease to operate, the Sway Bar light may come on, and the DTC U1412
(Implausible Vehicle Speed Signal Received) will be set along with the Check Engine Lamp / MIL. If this
occurs there are some easy solutions (choose any one of these):
1. Cycle the key off then on to ignition, then Clear DTC codes using the AEV ProCal
2. Program a new tire size (at least .25” different then last programmed) then cycle the key off
3. Use the Restore feature, then reprogram desired settings (cycle the key between each feature)
4. Pull the Positive (+) battery terminal away from the battery for a few minutes to reset the vehicle
5. The problem will eventually resolve itself, but use this as a last resort.
Axle Ratio Mode
Description: This mode allows the user to modify the gear ratio setting in the vehicle’s computer. This
will ensure proper automatic transmission shift points.
Notes: There is a common decimal discrepancy in certain ratios, ignore minor conflicts in ratio value and
select the closest ratio possible.
Procedure: Consult the Quick Reference Guide and set the DIP switches accordingly. With the engine off
and ignition on, plug the module into the OBD port and wait for the horn to sound. If the horn does not
sound, consult the troubleshooting section of these instructions.