Abbreviations and Commonly Used Terms. (Cont)

TM 9-2320-364-34-1

2-9. INTRODUCTION TO LOGIC TREE TROUBLESHOOTING (CONT).

(21)

EUI - Electronic Unit Injector.

(22)

Historical Codes - All codes kept in DDEC ECM memory (may not trip the CEL). These codes can be

cleared by using the Diagnostic Data Reader.

(23)

OPS - Oil Pressure Sensor: Monitors oil pressure at the main oil gallery.

(24)

OTS - Oil Temperature Sensor: Monitors oil temperature in the turbo oil supply line.

(25)

PW - Pulse width: The amount of time in crank degrees that the DDEC ECM is requesting the injectors

to be turned on.

(26)

SRS - Synchronous Reference Sensor: Detects when the first cylinder in the firing order is about to be

fired.

(27)

STE/ICE-R - Simplified Test Equipment for Internal Combustion Engines - Reprogrammable: A testing

system used for performing tests and measurements on the truck. 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

(TK), cables, transit case and technical publications. STE/ICE tests are referenced.

(28)

System - A collection of devices which all are 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 and injectors.

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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.

(30)

Test Chain: A series of tests to be followed in a particular order or sequence (numbered).

(31)

TPS - Throttle Position Sensor: Used to detect throttle position (percent of throttle).

(32)

Troubleshooting - The process of making measurements and observing the operation of the truck to find

out if and where any problems exist.

(33)

TRS - Timing Reference Sensor: Detects whenever any cylinder is about to be fired.

(34)

VIN - Vehicle Identification Number.

(35)

VTM - Truck Test Meter: A box which performs the measurement and analysis functions of the

STE/ICE-R system.

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