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Cummins/Onan MDDC Troubleshooting

Cummins/Onan MDDC troubleshooting: 26 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.

Cummins/Onan MDDC — full specs, parts & maintenance.

Code	Meaning	Cause
No. 16	Engine Pre-Alarms
Code No. 3	Service Check
Code No. 16	Engine Fault	Above Normal
SPN: 97, FMI: 0	Water In Fuel Indicator, Above Normal
SPN: 100, FMI: 1	Engine Oil Pressure, Below Normal
SPN: 110, FMI: 0	Engine Coolant Temperature, Above Normal
SPN: 190, FMI: 0	Engine Speed, Above Normal
SPN: 629, FMI: 13	Controller #1, Out of Calib
SPN: 970, FMI: 31	Auxiliary Engine Shutdown Switch
SPN: 1076, FMI: 3	Fuel Injection Pump Valve, Volt. Out/Range
SPN: 1076, FMI: 5	Fuel Injection Pump Valve, Cur. Out/Range
SPN: 1076, FMI: 10	Fuel Injection Pump Valve, Abnormal Rt/Chg
SPN: 1076, FMI: 13	Fuel Injection Pump Valve, Out of Calib.
SPN: 1109, FMI: 31	Approaching Shutdown
SPN: 1110, FMI: 31	Engine Has Shut Down
SPN: 1569, FMI: 31	Engine Torque Derate
SPN: 2000, FMI: 06	ECU Failure, Cur. Out/Range
SPN: 100, FMI: 3	Engine Oil Pressure, Voltage Out of Range
SPN: 100, FMI: 4	Engine Oil Pressure, Volt. Out/Range
SPN: 105, FMI: 3	Intake Manifold Temperature, Volt. Out/Range
SPN: 105, FMI: 16	Intake Manifold Temperature, Above Normal
SPN: 110, FMI: 3	Engine Coolant Temperature, Volt. Out/Range
SPN: 158, FMI: 17	Battery Potential, Below Normal
SPN: 174, FMI: 3	Fuel Temperature, Volt. Out/Range
SPN: 174, FMI: 16	Fuel Temperature, Above Normal

Symptom	Remedy
Exhaust leaks	Inspect for exhaust leaks at every startup and after every eight hours of operation.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.

Cummins/Onan MDDC: Engine Fault — what causes it?

Documented causes: Above Normal. See the table for the matching fixes.