TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 455 of 926
TM 9-2320-283-20-1
STE/ICE TROUBLESHOOTING.
2-14.
VEHICLE TEST METER TROUBLESHOOTING (Continued).
b.
The STE/ICE VTM operator may follow either of two test procedures when using STE/ICE as follows:
(1)
Diagnostic Test Procedures.
The GO/NO-GO diagnostic test procedures are used for troubleshooting malfunctioning vehicles where the
primary fault is unknown.
In the GO logic chain, the satisfactory result (yes) from each test leads to a GO to the
next test.
If the truck fails the test in the GO chain, the unsatisfactory result leads to a corrective action, higher
level of maintenance, or to the NO-GO chain.
The NO-GO
logic chain contains procedures to
determine the
cause of failure and is arranged in steps detailing fault isolation and corrective action.
When using a GO or NO-
GO diagnostic procedure, the VTM operator must start at the beginning of the logic chain because the limits and
steps for each test depend on previous steps.
(2)
General Purpose Test Procedures.
The general purpose test procedures are used for making individual measurements when primary fault diagnosis
has been done through the use of a troubleshooting table and verification of a malfunctioning part or system is
desireable
before parts
replacement.
Refer
to
this test
procedure method when performing one specific
STE/ICE test or when you do not want to follow the diagnostic GO/NO-GO logic chains.
All VTM general purpose
test procedures applicable to the M915A1 truck are found in TM 9-4910-571-12&P. General purpose test
procedures may also be done using the M915A1 Truck Test Card found at the back of this TM.
c.
The GO chain index, paragraph 2-17, contains a list of GO test numbers and titles.
Refer to this paragraph
for locating a specific GO chain test.
d.
The NO-GO chain index, paragraph 2-18, contains a list of NO-GO test numbers and
titles.
Refer to
this
paragraph
for locating a
specific NO-GO chain test.
e.
The M915A1 Truck
Test Cards are found at the back
of this TM.
Use the sheet for reference purposes
when
doing general purpose test procedures.
As you become more experienced you can rely solely on the Test Cards
for doing GO/NO-GO chain and general purpose test procedures.
2-330
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