TM 9-2350-256-20
SECTION V: TROUBLESHOOTING
c. ELECTRICAL TROUBLESHOOTING
Electrical troubleshooting in this chapter includes
schematic diagrams to give insight to the harnesses
involved.
When troubleshooting any electrical system or component, exercise care to prevent electrical shock.
W A R N I N G
Ensure MASTER switch is OFF between every step unless otherwise directed throughout
troubleshooting of the electrical stem or electrical components.
Remove all jewelry and metal
objects when working on electrical systems to prevent injury due to electrical shock.
The multimeter is used throughout electrical troubleshooting.
STE/ICE-R can also perform as a multimeter and
instruction on its use is in TM 9-4910-571-12&P.
2 - 1 6 Q U I C K G U I D E T O T R O U B L E S H O O T I N G
a. MECHANICAL
Item
Engine
Fuel, Air
Intake, and
Exhaust Systems
Oil Cooling
System
Ventilation
Blower
Assembly
Problem
1
2
3
4
1
2
3
4
5
6
1
2
3
4
1
2
3
Engine fails to crank when start switch is pressed.
Engine cranks at normal speed but will not start after two
attempts to start.
Engine cranks at normal speed but will not start during extreme
cold weather.
Engine cranks slowly and will not start.
Engine start running but fails to stay running.
Engine fails to shut off when the engine fuel shutoff switch is
activated.
Engine fails to stop when fuel shutoff handle is pulled.
Engine stalls at low rpm, does not develop full power, and has
excessive smoke from one or both banks of cylinders.
Engine stalls at low rpm and does not develop full power, but
exhaust smoke is normal.
Engine runs rough or misfires, knocks, and/or fuel consumption is
excessive.
Low engine oil pressure, engine oil temperature normal.
High engine oil pressure, engine oil temperature normal.
Engine oil consumption excessive.
High engine oil temperature.
Blower motor does not run
Blower rum but does not come up to speed.
Blower unusually noisy.
Solution or
Reference
See page 2-30
See page 2-30
See page 2-40
See page 2-40
See page 2-40.4
See page 2-40.4
See page 2-40.4
See page 2-40.3
See page 2-40.4
See page 2-40.4
See page 2-40.7
See page 2-40.7
See page 2-40.7
See page 2-40.7
See page 2-40.9
See page 2-40.9
See page 2-40.9
Change 1 2-35