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TM 9-2320-360-34-1
2-5. INTRODUCTION TO LOGIC TREE TROUBLESHOOTING (CONT)
(26)
SEL - CHECK GAUGES Indicator: mounted on the dash, it lights to warn the driver when a potential engine
damaging condition has been detected (low oil pressure, low coolant, or engine over-temperature). As a
light bulb check and system check, the CHECK GAUGES indicator will come on for about five seconds
when ignition takes place.
(27)
SRS - Synchronous Reference Sensor: detects when the first cylinder in the firing order is about to be fired.
(28)
STE/ICE-R - Simplified Test Equipment for Internal Combustion Engines -Reprogrammable: A testing
system used for performing tests and measurements on the vehicle. In addition to acting as a conventional
digital multimeter to measure voltage, current and resistance, it is also capable of measuring pressure,
speed, compression unbalance, engine power, and some specialized battery and starter evaluations. It is
powered from the vehicle batteries. The complete system includes a vehicle test meter (VTM), a
transducer kit (TK), cables, transit case, and technical publications. STE/ICE tests are referenced.
(29)
System: A collection of devices which are all related to each other because they depend on each other to
do some function or job. For example, the function of the fuel system is to inject fuel into the cylinders at
the correct time in the correct amount and with the correct quantity. The collection of devices that are
required to do this include the fuel pump, fuel lines, lift pump, fuel filter, injection pump, and injectors.
(30)
TBS - Turbo Boost Sensor: used to monitor turbo boost pressure. The sensor generates a voltage (from 0
to 5 volts) which is proportional to pressure.
(31)
Test Chain: A series of tests to be followed in a particular order or sequence(numbered).
(32)
TPS - Throttle Position Sensor: used to detect throttle request.
(33)
TPS - Throttle Position Sensor: used to detect throttle request.
(34)
Troubleshooting: The process of making measurements and observing the operation of the vehicle to find
out if and where any problems exist.
(35)
TRS - Timing Reference Sensor: detects whenever any cylinder is about to be fired.
(36)
VIN - Vehicle Identification Number
(37)
VTM - Vehicle Test Meter: A box which performs the measurement and analysis functions of the STE/ICE-
R systems.
f.
Contact Test Set (CTS).
The troubleshooting for the HET M1070 Tractor was developed utilizing the Digital Data Reader (DDR) and
Simplified Test Equipment for Internal Combustion Engines (STE/ICE-R). Since the initial publication of this
manual, the Contact Test Set (CTS) has been developed for use as the primary Test, Measurement, and
Diagnostic Equipment (TMDE) for the HET M1070, in place of the DDR and STE/ICE-R.
The CTS J1708 programming performs the same function as the DDR and the CTS/ICE programming
performs the same tests as the STE/ICE-R unit. The procedural steps contained within this manual still
reflect the original test equipment, however, the CTS can be used to troubleshoot the vehicle. The same test
results will be obtained using either piece of test equipment.
Some of the detailed test procedures shown on the right-hand pages of the troubleshooting will deviate
slightly from the steps required to operate the CTS. For additional information on CTS operating procedures
and individual test instructions, refer to the information provided with the CTS unit.
2-14 Change 1
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