TM-9-2320-343-10

TRUCK, CARGO, 8X8 M985A4 W/WINCH AND M985A4 W/O WINCH

TECHNICAL MANUAL; OPERATOR'S MANUAL

OCTOBER 2008
TM-9-2320-343-10

  TM-9-2320-343-10 - Page 127 of 1128

OPERATOR MAINTENANCE
POWER TRAIN
POWER TRAIN
The drivetrain control system consists of the engine and transmission systems.
The vehicle drivetrain is enhanced through the use of an engine electrical control system
and 4500SP electronic transmission controller.
The engine electrical control and 4500SP transmission systems perform self-diagnostics,
engine/transmission system diagnostics, and vehicle performance diagnostics.
Self-diagnostics includes personnel-initiated checks of main electronic components such
as solenoids, wiring, sensor, and control modules.
System-diagnostics monitor critical engine and transmission parameters such as oil
temperature, oil pressure, coolant temperature, voltage, and gear range attained.
Vehicle performance diagnostic capabilities aid the mechanic in isolating problems outside
of the electronic control system.
Operating data is stored in the engine electrical control system and 4500SP electronic
transmission controller memory for display at a later time.
Power Train
Power for the vehicle is provided by a diesel engine (1), which is coupled directly to an
automatic transmission (2).


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