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HORN DOES NOT WORK
Table 2-5. STE/ICE GO-Chain Tests

TM-9-2320-272-24-1 Truck 5-Ton 6x6 M939 M939A1 M939A2 Series Trucks (Diesel) Manual
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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
PAGE
TEST
MODE
TEST TITLE
NUMBER
NUMBER
GO1
2-220
VTM Connections and Checkout
DCA
2-225
TK
First Peak Test - Starter Current
GO2
2-227
TK
Engine Start - Lubrication Check
GO3
2-230
Charging Circuit and Battery Voltage Test
DCA
GO4
2-232
Engine Warmup/Coolant Check/Oil Pressure Test
DCA
GO5
2-234
DCA
Governor Check/Power Test
GO6
2-236
Idle Speed/Governor Check
DCA
GO7
2-237
Compression Unbalance Test
DCA
GO8
--
--
2-239
DC Voltage Test
Table 2-6. No-Go-Chain Test Index, Combined Mode Chain.
NO-GO
PAGE
MODE
TEST TITLE
TEST
NUMBER
NUMBER
NG05
2-241
TK
Low Oil Pressure Check
NG20
2-243
DCA
No Crank - No Start
NG30
2-244
Engine Crank - No Start
DCA
NG31
2-247
DCA
Gauge Test
NG50
2-249
DCA
Charging Circuit Tests
NG80
2-250
DCA-TK
Starter Circuit Tests
NG81
2-255
DCA
Battery Tests
NG90
2-261
Governor/Power Test Fault Isolation
DCA
NG130
2-266
Engine Tightness Test
DCA
2-219






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