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 935 of 1313
LOW AIR PRESSURE WARNING BUZZER WILL NOT SHUT OFF (AIR PRESSURE GAUGES AT NORMAL
SYSTEM PRESSURE) - Continued
STEP
5.
IS WIRE 578 IN GOOD CONDITION?
a.
Place battery switch to OFF position.
b.
Install wire 578A to primary and secondary low air pressure switch.
T0108DAA
Figure 5.
Failsafe Warning Control Module.
c.
Visually inspect wire 578 for frayed or damaged condition.
d.
Disconnect wiring harness at failsafe warning control module.
e.
Make sure air gauges read at least 90 psi.
f.
Connect multimeter red lead to pin F on wiring harness connector. Refer to point to point schematics.
g.
Connect multimeter black lead to good ground.
h.
Meter reading should be less than 600 ohms.
TM 9-2320-272-23-1
0110
0110-10
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