TM-9-2320-338-10
TRUCK, CARGO, 8X8, M977A4
TECHNICAL MANUAL; OPERATOR'S MANUAL
OCTOBER 2008
TM-9-2320-338-10 - Page 136 of 1120
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.
TRAILER
AIR SUPPLY
PARKING
BRAKE
TRAILER
AIR SUPPLY
PARKING
BRAKE
AIR BRAKE
M
M
2
3
4
Figure 2.
The EUI allows precise metering and injection timing.
The engine sensors monitor key parts of the engine for performance and environmental
variables.
The ECM (1) features diagnostics which can sense electronic system malfunctions and
identify them by displaying a code.
A check engine indicator (3) on instrument panel will illuminate when a noncritical fault
occurs, but the vehicle can still be operated.
Diagnostic codes can be accessed by a PC based software program or a diagnostic data
reader connected to the vehicle at the electronic diagnostic receptacle (4).
TM 9-2320-338-10
0013
0013-2
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