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 274 of 1313
GENERAL TROUBLESHOOTING INDEX - Continued
Malfunction/Symptom
Troubleshooting Procedure
4.
All Gauges Inoperative.
.....................................................................................................................
WP
0104
5.
Transmission Temperature Gauge Inoperative.
................................................................................
WP
0105
6.
Temperature Gauge Inoperative (Coolant).
......................................................................................
WP
0106
7.
Fuel Gauge Inoperative.
....................................................................................................................
WP
0107
8.
Battery/Alternator Gauge Inoperative.
...............................................................................................
WP
0108
9.
Horn Inoperative.
...............................................................................................................................
WP
0109
10.
Low Air Pressure Warning Buzzer Will Not Shut Off (Air
Pressure Gauges At Normal System Pressure).
...............................................................................
WP
0110
11.
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).
.........................................................................................................
WP
0111
12.
Spring Brake Warning Light Inoperative With Spring Brake
Override Engaged.
............................................................................................................................
WP
0112
TRAILER CONNECTION
1.
One Or More Trailer Lights Inoperative.
............................................................................................
WP
0113
CAB HEATER
1.
Heater Will Not Operate With Switch In LOW Position (HIGH
Position Operation Normal).
..............................................................................................................
WP
0114
2.
Heater will Not Operate With Switch In HIGH position (LOW
Position Operation Normal).
..............................................................................................................
WP
0115
3.
Heater Will Not Operate In LOW Or HIGH Position.
.........................................................................
WP
0116
4.
No Cab Heat (Coolant Temperature Gauge Reads Normal).
...........................................................
WP
0117
COMPRESSED AIR AND BRAKE SYSTEM
1.
Parking Brake Does Hot Hold Vehicle On Grade.
.............................................................................
WP
0118
2.
Parking Brake Drags, As Indicated By Smoking Or Burning
Smell.
................................................................................................................................................
WP
0119
3.
Insufficient Brakes (Vehicle Stopping Distance Too Long, No
Apparent Air System Failure With Gauges At Normal Operating
Pressure, Warning Buzzer Not Sounding).
.......................................................................................
WP
0120
4.
Vehicle Pulls Right Or Left When Applying Brakes.
..........................................................................
WP
0121
5.
Vehicle Rear Brakes Grab Or Drag.
..................................................................................................
WP
0122
6.
Vehicle Vibrates, Chatters, Or Bounces When Brakes Are
Applied.
.............................................................................................................................................
WP
0123
7.
Brakes Squeal.
..................................................................................................................................
WP
0124
TM 9-2320-272-23-1
0005
0005-5
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