TM-9-2350-311-10
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; OPERATOR’S MANUAL
NOVEMBER 1994
TM-9-2350-311-10 - Page 401 of 775
TM 9--2350--311--10
Change 6
3--3
3--3
MALFUNCTION INDEX — CONTINUED
Troubleshooting
Procedures
Page
PERSONNEL HEATER
Personnel heater fails to operate; personnel heater smokes or bangs upon starting
3--7
..........
Heat output is too low
3--7
...............................................................
PERSONNEL HEATER (GLOBAL A20)
NOTE
The operator can troubleshoot the codes listed below when displayed in the
diagnostic display window. If any other codes are displayed, notify unit
maintenance.
No personnel heater operation, no fault lamp operation, no diagnostic code display
3--8
..........
C3, Vent fan fault
3--8
...................................................................
E1, Low voltage
3--8
....................................................................
E3, Low burner air flow
3--8
..............................................................
F1, Ignition overtime
3--8
................................................................
F2, Burner flameout
3--8.1
.................................................................
F3, Heat limit
3--8.1
.......................................................................
F4, Vent air overheat
3--8.1
................................................................
F6, Inlet overheat, Vehicle ambient temperature is above 131
_
F(56
_
C)
3--8.1
....................
F7, Exhaust overheat
3--8.1
...............................................................
BILGE PUMP
Bilge pump fails to operate
3--8.2
...........................................................
BREECH
Breech does not close completely
3--8.2
.....................................................
CANNON
Jerky recoil; excessive recoil force; excessive recoil travel at high angle of fire
3--9
..............
Primer does not fire
3--9
.................................................................
Primer not ejected properly
3--10
..........................................................
Cab fills with smoke or gases after firing
3--10
...............................................
Bore evacuator or muzzle brake thrust collar becomes loose
3--10
.............................
CAB TRAVERSING SYSTEM
Cab will not traverse freely in manual mode
3--11
............................................
Cab will not traverse freely in power mode
3--11
.............................................
Cab creeps
3--12
........................................................................
Traversing mechanism assembly overheats
3--12
............................................
ELEVATING SYSTEM
Cannon does not elevate or depress under power or manually, but hydraulic pressure is
normal
3--12
...........................................................................
Effort required to elevate cannon is greater or less than effort required to depress cannon
3--12
....
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