TM-9-2320-272-23-2

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5

SEPTEMBER 2012
TM-9-2320-272-23-2

  TM-9-2320-272-23-2 - Page 246 of 1417

FIELD MAINTENANCE
STE/ICE TROUBLESHOOTING
INTRODUCTION
1.
This chapter is applicable only if STE/ICE is available. This section contains information and tests which
may be used with STE/ICE to locate malfunctions that may develop in the vehicle. The tests can be used
during troubleshooting, Preventive Maintenance Checks and Service (PMCS), or after replacing parts to
isolate malfunctions, anticipate failures, and ensure that proper repairs have been made.
2.
STE/ICE is used primarily with the vehicle electrical system. These tests cannot cover all possible troubles
which may occur. If a particular malfunction is not covered, refer to Electrical Troubleshooting (Volume 1,
WP
0004), and locate the troubleshooting procedure for the malfunction observed.
3.
These procedures are a step-by-step approach to a problem that directs tests and inspections toward the
source of a problem and a successful solution.
4.
Each malfunction symptom given for an individual component or system is followed by step(s) to determine
the cause and corrective action you must take to remedy the problem.
5.
Before taking any corrective action for a possible malfunction, the following rules should be followed:
a.
Question operator to obtain any additional information that might help you to determine the cause
of the problem.
b.
Never overlook the chance the problem could be of a simple origin. The problem could require only
a minor adjustment.
c.
Use all senses to observe and locate troubles.
d.
Use test instruments and gauges to help you determine and isolate problems.
e.
Always isolate the system where the malfunction occurs and locate the defective component.
f.
Use standard automotive theories and principles when troubleshooting the vehicles covered in this
manual.
g.
Operate the vehicle yourself to ensure the operator’s description of the problem is correct.
6.
This chapter cannot list all malfunctions that may occur. If a malfunction occurs that is not listed in the tables,
notify supervisor.
7.
If malfunction corrective action does not correct malfunction, notify supervisor.
CHAIN INDEXES
Use vehicle entry 06 on test select switches for M939/A1 series vehicles; 31 for M939A2 series vehicles.
TM 9-2320-272-23-2
0186
0186-1


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