TM-9-2320-272-23-1

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

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-1 - Page 1254 of 1313

FIELD MAINTENANCE

CONTROL PANEL LIGHTS WORK, SYSTEM FAILS TO INFLATE OR DEFLATE

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Goggles, Industrial

(Volume 5, WP

0826, Table 1, Item 20)

Multimeter

(Volume 5, WP

0826, Table 1, Item 34)

Soap Solution

Test Set, Electronic Systems

(Volume 5, WP

0826, Table 1, Item 51)

Personnel Required

(2)

References

Point to Point Schematics

References (cont.)

WP

0128

Volume 2, WP

0322

Volume 2, WP

0324

Volume 5, WP

0805

Volume 5, WP

0810

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

CONTROL PANEL LIGHTS WORK, SYSTEM FAILS TO INFLATE OR DEFLATE

NOTE

Conduct these malfunction tests if control panel lights work, but the system fails to inflate or

deflate. This procedure will check for a problem with air lines between pneumatic controller

and wet tank. It will also check for a faulty air supply from the vehicle air compressor, CTIS

wiring harness, pneumatic controller, electrical lead at wet tank pressure switch, and pressure

switch.

TM 9-2320-272-23-1

0149

0149-1