M2/M3 BFV: FIRE SUPPRESSION SYST - OD1607 - LESSON 2/TASK 1
as general as "the fire suppression system does not work" does not
point directly to the specific malfunctioning component so that the
problem can be fixed. Knowing how to isolate the faulty component is
an essential part of materiel maintenance.
This process of
systematic isolation of defective components by analyzing trouble
symptoms and testing for defective components so that corrective
action can be taken is known as troubleshooting. Troubleshooting, in
the general sense, is a logical thought process.
When applied
methodically, this thought process leads to the identification of
defective parts so that the malfunctioning equipment can be repaired.
The general description of troubleshooting methods can be outlined in
four steps. First, it must be verified that the reported problem is
present in the vehicle.
The symptoms of the problem must be
identified, verified, and analyzed.
Second, the fault must be
isolated. This is done by applying the knowledge gained in step one
to identify the system in which the malfunction is occurring and then
to methodically test components in that system which could be causing
the problem.
Third, once the fault has been isolated, it will be
necessary to correct the fault by repairing, adjusting, or replacing
defective components.
Finally, it is necessary to verify that the
problem no longer exists and that there are no other problems.
a. Symptom
Analysis.
The
first
step
in
the
general
troubleshooting method may be called symptom analysis.
It consists
of getting as much information as possible to help identify the
specific nature of the symptoms causing the malfunction and analyzing
those symptoms.
The information needed to analyze the trouble
symptoms can be obtained by reading the DA Form 2404, interviewing
the vehicle crew, and test operating the malfunctioning equipment.
Then it would be necessary to look up the vehicle system where the
problem is located in the task index beginning on page 3-15 of TM 9-
2350-252-20-1-1.
This index will locate the troubleshooting
procedure in the TM. In the case of the fire suppression system, the
troubleshooting procedure begins on page 3-638 of TM 9-2350-252-20-1-
1.
b. Performing
the
Troubleshooting
Procedure.
Once
the
appropriate troubleshooting procedure has been located in the TM, it
is necessary to work through
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