TM 9-4940-568-20
2-53
Table 2-7. Engine Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. THE ENGINE RUNS UNTIL FAULT SHUTDOWN.
The OVERSPEED lamp comes on and the engine shuts down.
a. Reset the Engine Control Monitor (ECM) (A11 card) by pushing the Run-Stop-Remote
switch to Stop. Push the Reset switch to Reset, and restart engine, monitoring engine
speed. Readjust the cutout speed if it is lower than specified. Replace the overspeed
module (Para 8-16) or the magnetic speed pickup sensor if it cannot be readjusted (Para
8-17).
b. If the set still shuts down due to overspeed, reinstall the magnetic speed pickup sensor
to make sure the clearance with the flywheel gear teeth is correct. Replace the speed
pickup sensor if output voltage at cranking speed is less than 2.4 VDC as measured at
terminals 10 (-) and 11 (-) on the governor.
c. Replace the governor controller if the set still shuts down due to overspeed.
The LO OIL PRESS lamp comes on and the engine shuts down.
a. Check the engine oil level, repair any oil leaks and fill to the proper level. Then reset the
ECM by pushing the Run-Stop-Remote switch to Stop, reset switch to Reset and restart the
engine.
b. If the engine still shuts down due to low oil pressure, restart the engine and observe oil
pressure while cranking the engine. Perform engine oil service (Para 8-2) if oil pressure is
less than 14 psi (97 kPa). Replace the low oil pressure cutout switch if oil pressure is
greater than 14 psi (97 kPa) (Para 8-39).
