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 940 of 1313
LOW AIR PRESSURE WARNING BUZZER WILL NOT SHUT OFF AND PARKING BRAKE WARNING LIGHT
FLASHES WITH HAND/PARKING BRAKE IN ANY POSITION (AIR PRESSURE NORMAL) - Continued
PARKING BRAKE VALVE
T1005DAA
PARKING BRAKE SWITCH
Figure 2.
Pressure Switch.
b.
Visually inspect wire 584 for frayed or damaged condition.
c.
Disconnect wiring harness at failsafe warning control module.
d.
Make sure parking brakes are released.
e.
Connect multimeter red lead to pin I on wiring harness connector. Refer to point to point schematics.
f.
Connect multimeter black lead to good ground.
g.
Meter reading should be less than 200 ohms.
CONDITION/INDICATION
IS WIRE 584 IN GOOD CONDITION?
DECISION
NO - Replace failsafe module (Volume 2, WP
0336). Go to Step (3) to verify problem is solved.
YES - Notify supervisor. Action may not be possible at this level of maintenance.
STEP
3.
IS YOUR ORIGINAL WARNING BUZZER PROBLEM STILL PRESENT?
a.
Ensure vehicle is returned to normal operating condition.
b.
Check to see if your original warning buzzer problem still exists.
CONDITION/INDICATION
IS YOUR ORIGINAL WARNING BUZZER PROBLEM STILL PRESENT?
DECISION
YES - Notify supervisor.
NO - Problem fixed.
END OF WORK PACKAGE
TM 9-2320-272-23-1
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