TM 5-3805-291-23-1
THEORY OF OPERATION - CONTINUED
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ENGINE - CONTINUED
10.
Electronic Control System Components.
a.
Electronic control system consists of these components:
Electronic Control Module (ECM)
Pressure sensors
Temperature sensors
Speed/Timing sensors
b.
ECM functions as an engine "throttle," modulating fuel quantity and injection timing to regulate engine perfor-
mance. ECM can activate ether injection and injector solenoid cycling to aid in starting. ECM will provide opera-
tors with an illuminated warning light if engine senses a problem. Operator may also experience an automated
engine derate. Warning light or engine derate could turn off during engine operation. Diagnostic codes will be
logged in ECM for diagnosis at later time.
c.
ECM is password-protected to secure ECM calibration and user-programmed information. Calibration can be
adjusted with flash files by authorized dealers. Flash files are programmed into personality module.
11.
Fuel Injector System.
a.
General. Electronic Fuel Injector (EFI) system consists of a mechanical and electronic system. Mechanical com-
ponents include a low pressure fuel supply system and electronic fuel injectors. Electrical system provides com-
plete electronic control of all engine functions using three types of signal: input, control, and output. Five major
components make up an EFI fuel system:
EFIs
Fuel transfer pump
ECM
Sensors
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