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TM 9-2320-360-34-1
Section II. TROUBLESHOOTING
2-4. INTRODUCTION TO LOGIC TREE TROUBLESHOOTING
a. Page Layout The troubleshooting is divided into symptoms peculiar to a vehicle system or component (for example,
winch system or engine).
First, determine the symptom or condition that indicates a problem or failure. Refer to page 2-16 to begin Engine
Electronic Controls (DDEC) troubleshooting or page 2-64 to begin vehicle troubleshooting
Go to the referenced page to begin troubleshooting. Open the manual flat so that both the right and left hand pages are
displayed before you. The information on all facing pages is important.
All diagnostic logic and flowcharts are on the left hand page, with supporting information, warnings, cautions, notes, and
test instructions on the right. (See figure on next page.) Pages are set up so you do not need any more than the
necessary information, notes, warnings and cautions about a particular question. The experienced technician can
generally read just left hand pages and refer to information on the right page when needed. All critical information for
decisions is on the left page.
b.
How To Begin Troubleshooting
(1)
Identify the symptom or fault. Select the applicable symptom (grouped by systems). Follow DDEC
Troubleshooting BEFORE going to Engine Troubleshooting.
(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 question. Helpful information about the problem is also on the left
page. Look on the right page for additional specific instructions and help.
(3)
Observe warnings, cautions, and notes. WARNING is the symbol for a warning statement. If you see this
block above a question on the left page, look on the right page for the text of the message. The WARNING
message on the right page will also have the symbol above it. CAUTION is the symbol for a caution
statement. If you see this block above a question on the left page, look on the right hand page for the text
of the message. The CAUTION message on the right hand page will also have the symbol above it.
Examples:
WARNING
Do not start engine with air Intake duct or exhaust pipe removed from
turbocharger. Failure to comply may result in Injury.
CAUTION
If OIL PRESS gage does not show engine oil pressure within 10-15 seconds after
starting engine, shut down engine immediately. Lack of lubrication may damage
engine.
NOTE
Left and right exhaust manifolds are checked in the same manner.
c.
Measurements Required for Troubleshooting
(1)
Resistance Measurements
(a)
Connect the red test lead to the volt-ohm input connector and black lead to the Common (COM) input
connector on the meter.
2-2
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