TM-9-2320-346-10

TRUCK, COMMON BRIDGE TRANSPORT (CBT), 8X8 M1977A4 W/WINCH AND M1977A4 W/O WINCH

TECHNICAL MANUAL; OPERATOR'S MANUAL

OCTOBER 2008

TM-9-2320-346-10 - Page 137 of 1184

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.

TM 9-2320-346-10

0013

0013-1