Troubleshooting Steps

HOW TO DIAGNOSE
The most important point in troubleshooting is to determine "Probable Cause." Once the probable causes are determined, parts to be checked can be limited to those associated with such probable causes. 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 symptoms could become more complicated, resulting in failure to determine the causes correctly and making incorrect repairs. The four steps shown should be followed in troubleshooting.







Observe the symptom carefully. Check if there are also other problems.

In determining the probable causes, it is necessary to study the wiring diagram to understand the circuit as a system. Knowledge of switches, relays and other parts is necessary for accurate analysis. The causes of similar problems in the past must be taken into account.

Troubleshooting is carried out by making step-by-step checks until the cause is found.

After the problems are corrected, be sure to check that the system operates correctly. Also check that new problems have not been caused by the repair.