TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 307 of 1015
TM 9-2320-272-24-1
2-24. STE/ICE TROUBLESHOOTING (SIMPLIFIED TEST EQUIPMENT FOR INTERNAL
COMBUSTION ENGINES)
a. General.
This section is applicable only if STE/ICE is available. This section contains information
and tests which may be used with STE/ICE to locate malfunctions that may develop in the vehicle. The tests
can be used during troubleshooting, Preventive Maintenance Checks and Service (PMCS), or after replacing
parts to isolate malfunctions, anticipate failures, and ensure that proper repairs have been made.
STE/ICE is used primarily with the vehicle electrical system. These tests cannot cover all possible
troubles which may occur. If a particular malfunction is not covered, refer to Electrical Troubleshooting,
para. 2-22, and locate the troubleshooting procedure for the malfunction observed. To obtain the maximum
number of observed symptoms of the malfunction, question the operator.
b. STE/ICE Chain Index.
PMCS (para. 2-12) contains a list of various troubles which may occur
during operation or inspection of the vehicle. When one of the malfunctions listed occurs, the mechanic
proceeds to the associated STE/ICE Chain Index.
c. Engine Chain Indexes.
Tables 2-5 and 2-6 provide indexes for GO and NO-GO test chains for
M939/A1/A2 series vehicles. The test chains are presented on the pages which follow.
NOTE
Use vehicle entry 06 on test select switches for M939/A1 series
vehicles; 31 for M939A2 series vehicles.
Table 2-5. Go-Chain Test Index, Combined Mode Chain.
GO
TEST
NUMBER
GO1
GO2
GO3
GO4
GO5
GO6
GO7
GO8
—
NO-GO
TEST
NUMBER
MODE
TEST TITLE
DCA
VTM Connections and Checkout
2-220
TK
First Peak Test - Starter Current
2-225
TK
Engine Start - Lubrication Check
2-227
DCA
Charging Circuit and Battery Voltage Test
2-230
DCA
Engine Warmup/Coolant Check/Oil Pressure Test
2-232
DCA
Governor Check/Power Test
2-234
DCA
Idle Speed/Governor Check
2-236
DCA
Compression Unbalance Test
2-237
—
DC Voltage Test
2-239
Table 2-6. No-Go-Chain Test Index, Combined Mode Chain.
PAGE
NUMBER
MODE
TEST TITLE
NG05
NG20
NG30
NG31
NG50
NG80
NG81
NG90
NG130
TK
DCA
DCA
DCA
DCA
DCA-TK
DCA
DCA
DCA
Low Oil Pressure Check
No Crank - No Start
Engine Crank - No Start
Gauge Test
Charging Circuit Tests
Starter Circuit Tests
Battery Tests
Governor/Power Test Fault Isolation
Engine Tightness Test
PAGE
NUMBER
2-241
2-243
2-244
2-247
2-249
2-250
2-255
2-261
2-266
2-219
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