TM-9-2320-342-10-1
TRUCK, WRECKER, 8X8 M984A4
TECHNICAL MANUAL; OPERATOR'S MANUAL
OCTOBER 2008
TM-9-2320-342-10-1 - Page 191 of 1428
OPERATOR MAINTENANCE
ENGINE SYSTEMS
ENGINE
NOTE
The Caterpillar C15 (on-highway) engine and is controlled electronically.
The primary components of electronic control system are electronic unit injector (EUI),
electronic control module (ECM), and engine sensors.
The ECM (1) contains:
1
Figure 1.
1.
A microprocessor that continuously monitors and analyzes the engine and
accompanying systems with electronic sensors during engine operation.
2.
A programmable read only memory (PROM) provides basic engine control function
instructions.
3.
An electronically erasable, programmable, read only memory (EEPROM) stores
engine calibration values.
4.
A backup EEPROM and microprocessor monitors and analyzes engine operation
should the main microprocessor fail and a throttle position sensor (2) input, which
is activated by the accelerator pedal.
TM 9-2320-342-10-1
0013
0013-1
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