Run Flat Mode

TM 9-2320-386-10

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

c. Run Flat Mode.

CAUTION

If tire condition deteriorates and cannot maintain at least fifty

percent of its lowest set point, run flat mode should be aborted to

prevent equipment damage.

NOTE

By pressing a terrain switch on the control panel, a vehicle operator

can start a pressure check cycle, beginning with the initial test

pressure sequence. After the initial test pressure sequence has

started, if air feeder lines and tires cannot hold at least 6 psi

(41 kPa), the system will sense a failure and the control panel dis-

play will read FLAT. With the presence of a flat tire indicated, the

vehicle operator may elect to call for assistance, or he may try

to drive to a repair center using the vehicle's run flat mode.

Run flat mode supplies pressure to the air lines and to all wheel valves

and allows maximum possible air pressure to the damaged tire.

RUN FLAT ACTIVE will be displayed on the LCD and the tire

pressure will be indicated in flashing lower case PSI.

(1) Run flat mode is engaged by pressing and holding for three seconds the

terrain button that the tire failure occurred in.

NOTE

PRESSURE ADJ. ABORT will be shown on the LCD, followed by

the normal display for the selected terrain when the set point is

reached.

By aborting any setting, the ECU will be in a stand by mode.

Ensure the correct terrain button is pressed and the CTIS is

allowed to complete a cycle to start the auto timer in the ECU.

(2) Run flat mode can be aborted by pressing any terrain switch.

CAUTION

In the event of CTIS failure, pressure/speed limitations displayed on

data plate must be observed when manually inflating/deflating tires.

(3) In the event of system failure, tires may be inflated manually (para. 3-9).

Table 2-3. Required CTIS Limits.

TIRE

ALLOWABLE DRIVING

SET

CONDITION

POINTS

PRESSURE RANGE

SPEED RANGE

Highway

45 psi

43-47 psi (296-324 kPa)

0-56 All Speeds

Cross-Country

33 psi

31-35 psi (214-241 kPa)

0-36 mph

Sand/Mud/Snow

20 psi

18-22 psi (124-152 kPa)

0-16 mph

Emergency

13 psi

11-15 psi (76-103 kPa)

0-5 mph

d. Operation in Extreme Cold.

Turn OFF the CTIS during operation in extreme cold, -0 to -65F (-18 to -54C).

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