TM-9-2320-272-24-1

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

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4

JUNE 1998

TM-9-2320-272-24-1 - Page 356 of 1015

TM 9-2320-272-24-1

CENTRAL TIRE INFLATION SYSTEM (CTIS) TROUBLESHOOTING SYMPTOM INDEX

MALFUNCTION

NO.

MALFUNCTION

TROUBLESHOOTING

PROCEDURE

PAGE

1.

Two pressure modes indicated with steady mode lights. . . . . . . . . . . . . .

2-269

2.

Four pressure mode lights flashing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-270

3.

Five indicator lights flashing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-271

4.

System repeatedly resumes cycling 30 seconds after mode

light stops flashing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-273

5.

6.

System shuts off during inflation, single mode light continues to flash .

2-273

System fails to deflate, partially deflates, or tire pressures are

imbalanced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-273

7.

8.

Control panel lights work, system fails to inflate or deflate . . . . . . . . . .

2-274

9.

Loss of amber warning light and/or overspeed pressure change . . . . . . .

2-275

System over-inflates tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-276

10.

Slow air recovery or occasional low air warning during braking . . . . . . .

2-276

Figure 2-1. Functional Troubleshooting Diagram - Central Tire Inflation System (CTIS).

2-268