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 TM 9-2320-279-20-1
Troubleshooting Instructions (Cont)
Figure 2-2 shows location of all circuit breakers to be checked during troubleshooting. Refer to it often. Each circuit
breaker is numbered on this illustration.
Troubleshooting Index
Troubleshooting
Procedure
Page
AIR SYSTEM
1.
Air pressure buildup slow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.
Moisture in air system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.
Compressor fails to unload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.
Noisy compressor operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.
Compressor cycles constantly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.
Air pressure drops rapidly after engine shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.
Compressor leaks oil or coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.
Safety valve fails to release system pressure at 150 psi (1034 kPa) . . . . . . . . . . . . . . . . . . . .
9.
Air system pressure builds up to more than 130 psi (896 kPa) . . . . . . . . . . . . . . . . . . . . . . . .
10.
Left or right windshield wiper does not work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.
Windshield washer does not work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.
Airhorn does not work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.
Axles will not lock up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.
Transfer case will not lock up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15.
Throttle treadle accelerates engine but no air pressure in remainder of air system . . . . .
16.
Seats (Air-ride) do not operate (A2 and A2R1 model vehicles only) . . . . . . . . . . . . . . . . . . . .
ARCTIC HEATER KIT
1.
Coolant pump fails to operate (indicator light does not come on) (Model A) . . . . . . . . . . . . .
2.
Coolant pump fails to operate (indicator light comes on) (Model A) . . . . . . . . . . . . . . . . . . . .
3.
Heat output to battery box too low (Model A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.
Heater fails to sufficiently warm engine (coolant pump operating) (Model A) . . . . . . . . . . .
5.
Circuit breaker opens (Model A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.
Arctic heater Fault Code Retrieval Device (FCRD) operation (Model B) . . . . . . . . . . . . . . . .
7.
Arctic heater does not operate (Model B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.
Arctic heater indicator light does not illuminate (Model B) . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.
Arctic heater diagnostic troubleshooting (Organizational Level) (Model B) . . . . . . . . . . . . .
DUAL AIR BRAKE SYSTEM
1.
Brakes will not respond properly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.
Uneven braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.
Service brakes fail to release or release slowly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.
Brakes grab when applied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.
Pressure drops over 25 psi (172 kPa) at gage when brakes are applied . . . . . . . . . . . . . . . . .
6.
Spring brakes will not apply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.
Spring brakes will not release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change 7
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