TM 5-3805-281-24-1
Sub-System Diagnostics
1 ENGINE AND PUMP CONTROLLER CIRCUIT DIAGNOSTIC PROCEDURES
IMPORTANT: Do not disconnect electrical connectors while the engine is running. Damage to Engine and
Pump Controller or other components may result. Disconnect connectors only when instructed during a
test or check.
NOTE: Before troubleshooting the circuits, clean all pins in the engine and pump controller, and harness connectors
using a non-conductive lubricating contact cleaner, then try the circuit operation again before proceeding. TY16324
Contact Cleaner can be used.
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Turn key switch OFF.
ENGINE AND PUMP
YES: Fuse is OK. Check
CONTROLLER 10 AMP
wiring harness.
9015
FUSE (F2) CHECK
Remove fuse block cover.
15
NO: Replace Fuse. If
72
Remove fuse from fuse block.
fuse blows again, check
for short.
Using ohmmeter, check fuse for continuity.
Is continuity measured?
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POWER ON 10 AMP
Turn key switch OFF.
YES: Fuse is OK. Check
FUSE (F5) CHECK
wiring harness.
Remove fuse block cover.
NO: Replace Fuse. If
Remove fuse from fuse block.
fuse blows again, check
for short.
Using ohmmeter, check fuse for continuity.
Is continuity measured?
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Turn key switch OFF.
ENGINE CONTROL (EC)
YES: Fuse is OK. Check
MOTOR 10 AMP FUSE
wire from fuse to monitor
(F3) CHECK
Remove fuse block cover.
controller connector D,
pins 1 and 2. If OK, go to
next check.
Remove fuse from fuse block.
NO: Replace Fuse. If
Using ohmmeter, check fuse for continuity.
fuse blows again, check
for short.
Is continuity measured?
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