Installation Manual

8-4 Troubleshooting
Troubleshooting Process
The fault isolation process is presented in a descending order of functional verifications. Yes-or-no gate
symbols are used to emphasize the elimination and isolation decision process. Typical examples are
shown below.
Example 1
4. Is the Cable malfunctioning?
Go to Step 5
Cable has failed. See Parts Replacement section.
No means the process has eliminated the Cable from being faulty and the fault isolation process is
continued in Step 5. Yes means the process has isolated the Cable as being faulty. After replacement,
proceed with the next consecutive Step unless otherwise noted.
Example 2
22. Did the Sensor pass the test?
Go to Step 23
Stop here. Sensor is not the root cause of fault.
No means the process isolated the Sensor as being faulty and that the necessary correction begins with
Step 23. Yes means the process has eliminated the Sensor from being faulty. Unless otherwise noted,
proceed with the next Verification process listed in the Fault Isolation Procedure.
? NOTE In many cases, replacing the first failed part isolated in the process is all that is necessary
to restore the system. In other cases, multiple causes may exist requiring the process
to continue.
TIP To quickly identify problems, look for obvious signs, such as burnt, discolored, missing,
damaged, or loose parts, obstructions, and foreign objects. Obvious uncharacteristic heat,
noise, vibration, odor, or movement can also be used to isolate problems. If a problem
frequently reoccurs, there may be other root causes to the problem.
No
Yes
No
Yes