TM-9-2320-272-10

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; OPERATOR'S MANUAL

SEPTEMBER 2004

CHANGE 2

TM-9-2320-272-10 - Page 370 of 481

TM 9-2320-272-10

3-21

CTIS STATUS INDICATION

SYSTEM MALFUNCTION

ACTION REQUIRED

Table 3-2. CTIS Indications

1. SINGLE MODE LIGHT: STEADY.

None. Air pressure achieved, wheel valves closed, and system stable.

None.

2. SINGLE MODE LIGHT: FLASHING.

None. System working to achieve new air pressure.

None.

3. TWO MODE LIGHTS ON: STEADY.

System has shut off with tire pressure between two settings, but vehicle and

CTIS are still operational.

Monitor and, if indication is repeated frequently, notify supervisor.

4. FOUR MODE LIGHTS FLASHING.

System has shut off due to air leak or possible tire damage and is waiting

for operator instruction.

a. Select RUN FLAT, if tire damage is minimal (vehicle is still

operational).

b. Change tire if tire damage is not minimal (para. 3-11).

c. Check for air leaks (para. 3-3).

5. FIVE LIGHTS FLASHING.

NOTE

If CTIS is not operational, disconnect electrical connector

from Electronic Control Unit (ECU) and complete mission

(para. 3-16).

System has shut off due to fault detection of CTIS component or system has

major air leak.

a. Check for air leaks (para. 3-3) and reset CTIS (para. 3-16).

b. Disable CTIS (para. 3-16) and notify unit maintenance.

6. RUN FLAT SELECTOR FLASHING (WITH A STEADY OR FLASHING MODE LIGHT).

None. RUN FLAT has been selected, and tire pressure is being checked at

frequent intervals (every 15 seconds).

May be turned off by depressing run flat mode.