WIRING HARNESS - Troubleshooting
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WIRING HARNESS
TROUBLESHOOTING
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The most important point in troubleshooting is to determine “Probable Causes”. Once the probable causes are
determined, parts to be checked can be limited to those associated with such probable causes. Therefore, unnec-
essary checks can be eliminated. The determination of the probable causes must be based on a theory and be
supported by facts and must not be based on intuition only.
TROUBLESHOOTING STEPS
If an attempt is made to solve a problem without going through correct steps for troubleshooting, the problem
symptoms could become more complicated, resulting in failure to determine the causes correctly and making
incorrect repairs. The four steps below should be followed in troubleshooting.
1 1
Observe the
1 problems.
symptom carefully. Check if there are also other
1 Observation of Problem Symptoms
b
0,
2 Determination of Probable Causes
\
In determining the probable causes, it is necessary to check the
wiring diagram to understand the circuit as a system. Knowledge
of switches, relays and other parts is necessary for accurate de-
termination. The causes of similar problems in the past must be
taken into account.
Checking of Parts Associated with
Troubleshooting is carried out by making step by step checks until
the true cause is found. Always go through the procedures con-
sidering what check is to be made where for the best results.
14 1 Repair and Confirmation
After the problems are corrected, be sure to check that the sys-
1 been caused by the repair,
tem operates correctly Also check that new problems have not
1 STB Revision
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