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CONTROLLER ALARM LIST WITH DESCRIPTION (CONTINUED)
Shutdown
Alarm Display
or Alarm
Sd StartFail
Shut Down
Wrn ECU Comm
Alarm
G ph opposed
Alarm
Gen L1 neg
Alarm
Gen L2 neg
Alarm
Gen L3 neg
Alarm
Gph + L1 Neg
Alarm
Gph + L2 Neg
Alarm
Gph + L3 Neg
Alarm
ECU Com Fail
ECU alarm
Alarm/SD
TROUBLESHOOTING AUTOMATIC SHUTDOWN CONDITIONS
LOW OIL PRESSURE SHUTDOWN
1. Check the level of the engine oil with the dipstick. The EZ-1 will shut the engine down when the oil
pressure is less than 20 psi. Add oil if required.
2. Visually inspect the engine for oil leaks.
3. If the oil level is good, restart the unit and verify the loss of oil pressure. Shut the engine down
immediately if the oil pressure value does not read 5 PSI within five (5) seconds.
4. Check the oil pressure sender on the engine block and the connecting wiring for damage. To
check for continuity between the sender and the EZ-1, remove the bolts at the top and center of the
control panel and open the panel like a door. Consult the DC wiring diagrams in this manual for the
proper path between the EZ-1 and the pressure sender.
5. If the oil level, pressure sender and wiring are good, the oil loss may be caused by engine failure.
Consult the engine OPERATION AND MAINTENANCE MANUAL for additional information on
excessive oil consumption.
HIGH COOLANT TEMPERATURE SHUTDOWN
1. Check the coolant level in the overflow jug.
2. Restart the engine and read the coolant temperature to verify High Coolant Temperature Shut-
down. Stop the engine immediately if the coolant temperature is 230°F or more.
3. Allow the engine to cool! Add coolant to the overflow jug if it is low and then check the level of
coolant in the radiator. To access the radiator cap, you must remove a small panel on top of the
generator housing directly above the radiator. Add coolant until it is 3/4" below the filler neck. Re
place the radiator cap and access panel.
4. Check the radiator shroud and ducting for blockage and remove any foreign matter.
5. Inspect coolant hoses, engine block and water pump for visible leaks.
6. Check the tension of the serpentine drive belt for the water pump.
7. Check the coolant temperature sender on the engine block and the connecting wiring for damage.
To check for continuity between the sender and the EZ-1, remove the bolts around the control panel
and slowly drop panel down. Consult the DC wiring diagrams in this manual for the proper path
between the EZ-1 and the pressure sender.
8. If the sender and wiring are good and no other problems are found, restart the engine. Observe the
coolant temperature and shut the engine down immediately if it starts to overheat.
9. Reduce the load on the generator and restart the engine. Observe the coolant temperature and
shut the engine down immediately if it starts to overheat. Consult the engine OPERATION AND
MAINTENANCE MANUAL for additional information on engine overheating.
Description
Engine failed to start after 3 attempts
J1939 Communication failure to the
engine ECU
Wrong Generator phase sequence (L1,
L2, L3)
Generator phase L1 is inverted
Generator phase L2 is inverted
Generator phase L3 is inverted
Wrong generator sequence (L1, L2, L3)
and is inverted
Wrong generator sequence (L1, L2, L3)
and is inverted
Wrong generator sequence (L1, L2, L3)
and is inverted
Controller failed to communicate with
engine computer
See ECU alarm list John Deere Book for
correct series engine
22
Possible Cause
Fuel, air, engine, battery issue
Com bus wiring issue, Engine ECU issue,
Battery disconnect switch off, blown fuse on
John Deere harness
Generator phases L1, L2, L3, COM are not
terminated in proper location on controller
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