Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 8)

5
Operator Instructions
Flange or Panel—Operator Controls
The integrated push button/display is the primary interface for
display of system information and for push button entry of
system instructions. The following sections explain the
purpose and operation of the ECU controls and display.
Terrain Selection
These keys select pressures appropriate for different surface
conditions. Any mode may be selected at any time (within
built in speed limitations). Depressing the button for the
current mode will result in a pressure check.
HWY (Highway)—For operation on improved paved surfaces.
XC (Cross Country)—For operation on non-paved secondary
roads.
SAND (Sand)—For operation on trails and other unimproved
surfaces.
EMER (Emergency)—For selection of extremely low tire
pressures to help free a stuck vehicle, or to traverse a short
distance over a terrain known to require very low tire
pressures. Since this is an extremely low pressure, the
warning lamp will flash whenever this pressure is utilized.
The EMER key is for extreme conditions only and should not
be used for normal driving.
Load Selection (Optional)
This feature allows selection of pressures appropriate for
different vehicle load conditions (full load, partial-load,
empty). Switching the load setting will result in a pressure
check and subsequent changing of the pressures as
determined by the system.
Mode Annunciator Lights
The associated annunciator lights indicate the selected mode
and signal one of two states:
If the light is flashing:
The system is in the process of checking or changing pres-
sures to attain the pressure(s) associated with that mode
light.
Some clicking may be heard from the PCU as the system
cycles to achieve the new pressure(s). A deflate will be
periodically interrupted as the system checks tire pressures to
determine how much further deflation is necessary.
Note: Adequate supply system pressure is required to begin
or continue any pressure changing sequence.
If the light is on steady:
The selected pressure has been achieved, the tires have been
isolated and the system is depressurized. The system will
cycle periodically to assure that tire pressure is maintained.
Note: The system is designed to allow tire pressure increase
due to heat buildup during vehicle use. This system will
not automatically deflate these pressure buildups—a
lower pressure mode must be selected to initiate a
deflate.
RUN
FLAT EMER
EMPTY
MUD
SAND
SNOW
PARTIAL
LOAD
CROSS
COUNTRY
FULL
LOAD H GHWAY
OVER SPEED
CHECK TIRES
WARNING
RUN
FLAT EMER
MUD
SAND
SNOW
CROSS
COUNTRY
HIGHWAY
OVER SPEED
CHECK TIRES
EMPTY
PART AL
LOAD
FULL
LOAD