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Section 5: Troubleshooting
General Troubleshooting
This information is intended to be a check or verification
for simple causes that can be located and fixed. It does
not cover all types of problems. See the OEM engine
manual for additional troubleshooting information.
Procedures that require in-depth knowledge or skills
should be performed by a GMASD.
Problem
Low fuel level shut-
down
Low oil pressure shut-
down
Low coolant level
shutdown
High coolant tem-
perature shutdown
Overcrank shutdown
Owner's Manual for Mobile Generator
Possible Causes
Low fuel level
Unit not level
Leaking fuel tank
Damaged fuel sender or
wiring
Low oil level
Leaking oil from engine
Oil pressure sender
Low coolant level
Leaking coolant hoses
Leaking engine block or
water pump
Low coolant level
Blockage in radiator
Leakage in coolant
hoses, engine block, or
water pump
Fuel level low
Check fuel level on controller.
Verify unit is sitting level to ensure an accurate reading.
Check tank for leaks.
Check for continuity between sender and engine controller.
Check oil level on dipstick. Add oil if necessary.
Visually inspect the engine for leaks. Restart unit and verify loss
of pressure. Immediately stop engine if pressure does not reach
5 psi (34.5 kPa) within five seconds.
See the OEM engine manual to identify corrective action.
Allow engine to cool, then check coolant level in radiator. Add
coolant if necessary.
Inspect hoses for leaks. Repair or replace as necessary.
Visually inspect for leaks. Verify no coolant has mixed with the
engine oil (oil will appear milky). See the OEM engine manual
for additional information.
Add coolant if necessary. Allow engine to cool, then check cool-
ant level in radiator. Restart engine and check coolant tempera-
ture (on controller). Immediately stop engine if coolant
temperature is 210 °F (99 °C) or higher.
Check radiator shroud and ducting for blockage and remove
any foreign matter.
• Inspect for visible leaks. Check tension of water pump
serpentine drive belt.
• Remove load on generator and restart engine. Check
coolant temperature and immediately stop engine if it
starts to overheat. See the OEM engine manual for addi-
tional information on engine overheating.
• Check fuel level in tank.
• Check fuel pump operation.
• Check air filter for blockage.
• See the OEM engine manual for additional information.
Solution
55
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