OPERATION OF CENTRAL TIRE INFLATION SYSTEM (CTIS)

TM 9-2320-386-10

2-19. OPERATION OF CENTRAL TIRE INFLATION SYSTEM (CTIS)

a. Normal Operation.

NOTE

When the accessory/battery switch is turned to the ON position,

CTIS will resume its previously selected mode of operation. It should

not be necessary to press the ON button to activate the CTIS.

The CTIS activates a pressure check cycle every 30 minutes to

ensure proper tire pressure.

The Electronic Control Unit (ECU) will remember the last terrain

setting used.

When tire pressure is at correct level, PSI SETPOINT will be dis-

played on the Liquid Crystal Display (LCD) in capital letters. If the

system is inflating or deflating, TIRE PRESSURE will be shown in

lower case letters with the selected terrain name flashing.

NOTE

If tire pressure falls below 10 psi, CTIS will not inflate tire.

(1) Start engine (para. 2-12) and allow vehicle air pressure to reach normal operat-

ing pressure of 90-120 psi (621-827 kPa).

(2) Drive the vehicle 3-5 miles (5-8 km) to allow seals to seat properly, especially in

cold environments.

NOTE

The terrain buttons correspond to a predetermined tire pressure for the

selected terrain (table 2-3).

Terrain selection may be aborted by pressing the same button again or

a different terrain button. PRESSURE ADJUST ABORT will be shown

on the LCD, followed by the normal display for a particular terrain set-

ting after the set point is reached.

During blackout operation, the backlighting of the LCD display can be

turned off by momentarily pressing the OFF button. To switch the

backlighting ON, the CTI system must first be turned OFF, by press-

ing and holding the OFF button for two seconds, and then press the

ON button which activates the CTI system and backlighting operation.

(3) Turn CTIS on with the ON button and select the desired terrain setting by

pressing the appropriate terrain button on the ECU (table 2-3).

(4) When the accessories/battery switch is turned off, the CTIS ECU will also be

turned off. Turn off ECU separately.

(5) Turn off CTIS/ECU by pressing and holding the OFF button until display

clears (2 seconds or more) prior to engine shutdown.

b. Overspeed Conditions.

NOTE

The maximum speed shown on the LCD will flash for approximately

one minute prior to switching to next highest terrain setting.

The ECU will not automatically switch settings if highway mode has

been selected.

If an overspeed condition occurs, the ECU (para. 2-3) will automatically switch to the

next highest terrain setting if the overspeed condition persists for longer than one minute.