TM-9-2320-209-20-2-1 Troubleshooting Part 1 for M44A1 and M44A2 Series Trucks
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TM 9 2320-209-20-2-1 a. The first box tells you the kind of gives you the name of the test equipment procedure. It also troubleshooting for which this procedure is used. In this case, the test equipment procedure is the DC VOLTAGE TEST. This test will be used to — troubleshoot faults in the battery system, the charging system, and voltage drops in the electrical system. b. Box gives you detailed test instructions. Next to the large dot are instructions telling you what to do. In this example you are told to set up the multi- meter test leads. Next to the small dots are instructions telling you how to set up the test leads. c. The multimeter jack table tells you which jack to plug the red (+) test lead into. d. The multimeter function table tells you how to set the function/range switch. 7-4. SAMPLE SUMMARY TROUBLESHOOTING PROCEDURE. The sample summary troubleshooting procedure given is the electrical system summary for the problem “CHARGING SYSTEM CHARGING TOO HIGH OR LOW. “ a. The first box tells you what kinds of problems the summary covers. In this example, the summary covers charging system problems. b. The charging system problems you will see on the truck are the fault symptoms “CHARGING SYSTEM (25 AMP) GENERATOR HAS TOO HIGH OR LOW CHARGING RATE” , and “CHARGING SYSTEM (60 AMP) ALTERNATOR HAS TOO HIGH OR LOW CHARGING RATE . “ c. To do the summary procedure for each fault symptom given, you follow the GO chains to each box. Any notes, cautions, or warnings that are given in the detailed troubleshooting procedures are also given in the summary. d. General instructions telling you what to do are given in box . Detailed instructions on how to do checks or tests are not given in the summary. If the answer to the question at the bottom of box A is , then you do the corrective action given in box .If the answer is YES , follow the GO chains to box and box and check the parts of the truck given in those boxes. You then repair or replace the parts that are bad. e. The note given under the last box in the GO chain means that you should look at the electrical system fault symptom index. This index will tell you where you can find the detailed troubleshooting procedure for the symptom “CHARGING SYSTEM (25 AMP) GENERATOR HAS TOO HIGH OR LOW CHARGING RATE. “ 7-2