Chapter 7. SAMPLE TROUBLESHOOTING PROCEDURE

TM 9-2320-209-34-1

CHAPTER 7

SAMPLE TROUBLESHOOTING PROCEDURE

7-1. GENERAL. This chapter gives a sample troubleshooting procedure. The purpose

of the sample procedure is to help you see how detailed troubleshooting procedures,

test equipment procedures, and summary troubleshooting procedures are used to find

faults in a system.

7.2. SAMPLE DETAILED PROCEDURE. (See figure 7-1.) The sample detailed pro-

cedure given is the fuel system troubleshooting procedure for the symptom, STARTER

MOTOR WILL NOT CRANK ENGINE. This symptom is one you will have when you try

to start your truck and certain parts on the truck are not working correctly. In each

numbered box, instructions are given which tell you what to do, and how to do it.

A large dot is placed next to the "what-to-do" instructions, and small dots next to

the "how-to-do-it" instructions.

a. Box number

gives general instructions on getting the truck ready before you

start to troubleshoot.

b. Box number

gives fault isolation test instructions. In this case you are told

to check the starting system circuit for loose, burned, or broken leads and connections.

These tests or checks, are often referred to in detailed troubleshooting procedures to

help you find the problem and fix it. After you do the tests or checks you read the

question at the bottom of box number

If the starter system is not okay, the

answer to the question is

so you go to the next box.

gives you a corrective action. In this case the fault is burned

Box number

or broken leads or connectors. The corrective action is what you do to fix the fault,

which is to replace any burned or broken leads or connectors. If the engine still

doesn't start after you do this, it could mean that there are other faults in the system.

When this happens, go back to the beginning of the procedure and do each step again

until you find the other faults.

d. Sometimes the corrective actions given for a fault will tell you what to do to fix

the fault, but will not give you detailed instructions on how to fix it. Instead, you

will be told to refer to another volume in this manual for these instructions. Box

number

is an example of this.

7-1