Chapter 7. SAMPLE TROUBLESHOOTING PROCEDURE

TM 9-2815-214-34-1

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 procedure given is the starter 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 1 gives general instructions on getting the truck ready before you start to troubleshoot.

b. Box number 2 gives fault isolation test instructions. In this case you are told to check 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 2. If the starter system is not okay, the answer to the question is NO, so you go to the next box.

c. Box number 3 gives you a corrective action. In this case the fault is burned or broken leads or connectors. The

corrective action is what you do to fix the fault, which is to replace any burned or broke 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 4 is an example of this.

7-1