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 932 of 1313

LOW AIR PRESSURE WARNING BUZZER WILL NOT SHUT OFF (AIR PRESSURE GAUGES AT NORMAL
SYSTEM PRESSURE) - Continued
b.
Visually inspect wire 57 for frayed or damaged condition. Refer to point to point schematic.
c.
Disconnect wire 57 from secondary low air pressure switch.
d.
Place battery switch to ON position.
e.
Place start switch to RUN position.
f.
Make sure air gauges read at least 90 psi.
NOTE
If alarm is silenced when jumper wire is installed, wire 57 is faulty.
g.
Connect jumper wire from open contact on secondary low air pressure switch to good ground.
CONDITION/INDICATION
IS WIRE 57 IN GOOD CONDITION?
DECISION
NO - Repair or replace wire 57 (Volume 3, WP
0352). Go to Step (6) to verify problem is solved.
YES - Go to Step (4).
TM 9-2320-272-23-1
0110
0110-7


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