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

  TM-9-2320-272-23-1 - Page 928 of 1313

LOW AIR PRESSURE WARNING BUZZER WILL NOT SHUT OFF (AIR PRESSURE GAUGES AT NORMAL
SYSTEM PRESSURE) - Continued
c.
Disconnect wires 578 and 578A from primary low air pressure switch.
d.
Set up multimeter to measure resistance.
e.
Connect multimeter red lead to contact end of pressure switch. Refer to point to point schematics.
f.
Connect multimeter black lead to other contact end of pressure switch.
g.
Meter reading should be less than 300 ohms.
CONDITION/INDICATION
IS PRIMARY LOW AIR PRESSURE SWITCH WORKING PROPERLY?
DECISION
NO - Replace primary low air pressure switch (Volume 2, WP
0342). Go to Step (6) to verify problem is solved.
YES - Go to Step (2).
TM 9-2320-272-23-1
0110
0110-3


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