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.
during operation or inspection of the vehicle. When one of the malfunctions listed occurs, the mechanic
proceeds to the associated STE/ICE Chain Index.
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
VTM Connections and Checkout
DCA
TK
First Peak Test - Starter Current
GO2
TK
Engine Start - Lubrication Check
GO3
Charging Circuit and Battery Voltage Test
DCA
GO4
Engine Warmup/Coolant Check/Oil Pressure Test
DCA
GO5
DCA
Governor Check/Power Test
GO6
Idle Speed/Governor Check
DCA
GO7
Compression Unbalance Test
DCA
GO8
--
--
DC Voltage Test
Table 2-6. No-Go-Chain Test Index, Combined Mode Chain.
NO-GO
PAGE
MODE
TEST TITLE
TEST
NUMBER
NUMBER
NG05
TK
Low Oil Pressure Check
NG20
DCA
No Crank - No Start
NG30
Engine Crank - No Start
DCA
NG31
DCA
Gauge Test
NG50
DCA
Charging Circuit Tests
NG80
DCA-TK
Starter Circuit Tests
NG81
DCA
Battery Tests
NG90
Governor/Power Test Fault Isolation
DCA
NG130
Engine Tightness Test
DCA
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