TROUBLESHOOTING SYMPTOMS.

TM 9-2330-385-14

5-7. TROUBLESHOOTING SYMPTOMS.

Table 5-1 lists the most common malfunctions found during operation of the trailer. Tests or inspections and

corrective actions should be performed in the order listed. This symptom index lists corrective actions that can be

performed by Direct Support.

5-8. INTRODUCTION TO LOGIC TREE TROUBLESHOOTING.

a. Page Layout. Troubleshooting is divided into symptoms peculiar to a trailer system or component, for

example, air system or inversion valve.

(1)

Determine the symptom or condition that indicated a problem or failure. Refer to the System Symptom

(2)

Go to the referenced page to begin troubleshooting. Open the manual flat so both the right and left pages

are displayed before you. The information on all facing pages is important.

(3)

All diagnostic logic and flowcharts are on the left-hand page, with supporting information, warnings,

cautions, notes and test instructions on the right-hand page. Pages are setup so you do not need anymore

than the necessary information, warnings, cautions and notes about a particular question. The experienced

technician generally read just the left-hand page and refer to information on the right-hand page when

needed: all critical information for decision making is on the left-hand page.

How to Begin Troubleshooting.

(1)

Identify the symptom or fault.

(2)

Follow the diagnostic procedure. Answer question no. 1 on the left-hand page and follow the YES or NO

path to either the remedy or the next page. Helpful information about the problem is also on the left-hand

page. Look on the right-hand page for additional specific instructions.

(3)

Observe WARNINGS, CAUTIONS and NOTES. If you see the WARNING symbol on the left-hand

page, look on the right-hand page for the test of the warning. The warning message on the right-hand page

will also have the symbol above it. If you see the CAUTION symbol on the left-hand page, look on the

right-hand page for the text of the caution. The caution message on the right-hand page will also have the

symbol above it. If you see the NOTE symbol on the left-hand page, look on the right-hand page for the

text of the caution. The note message on the right-hand page will also have the symbol above it.

Measurements Required for Troubleshooting.

(1)

Resistance Measurements.

(a)

Connect red test lead to Volt-Ohm input connector and black lead to COM input connector

on meter.

(b)

Set the function/range switch to the desired ohm position. If the magnitude of the resistance is not

known, set the switch to the highest range, then reduce until a satisfactory reading is obtained.

5-3