Cummins/Onan 350 IDIFIN troubleshooting: 12 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan 350 IDIFIN — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Symptom | Cause | Remedy |
|---|---|---|
| Engine stops cranking and fault lamp lights, after cranking approximately 75 seconds. | Check for empty fuel tank, fuel system leaks, or plugged fuel filters and/or supply lines. Correct as required. | |
| Fault lamp lights immediately after engine starts and unit shuts down. | Indicates possible overspeed condition. Check the governor and throttle linkage for binding and freedom of movement. Check electronic governor connections. Contact an Onan Distributor or the engine manufacturer if linkage is not at fault. | |
| Fault lamp lights and engine shuts down after running for a period. | . Check oil level and replenish if necessary. Check coolant level of radiator and heat exchanger sets and replenish if necessary. Check for slipping drive belts or for obstructions to the airflow. Check water flow valve on city water cooled seis and adjust if necessary. Contact an Onan Distributor or the engine manufacturer if none of the above. | |
| Engine runs, shuts down and cranks for 75-seconds. Cranking cycle stops; fault lamp lights. | . Check for dirty fuel filters and replace if necessary. (See MAINTENANCE section). Check for dirty or plugged air filters and replace if necessary. (See MAINTENANCE section) | |
| Fault lamp lights, no fault exists. | Engine monitor board or sensor malfunction. Contact an Onan Distributor. | |
| Overcrank fault lamp lights and engine stops cranking after approximately 75-seconds. | Check for empty fuel tank, fuel system leaks, or plugged fuel filters and/or supply lines. Correct as required. | |
| Engine runs, shuts down, cranks for 75-seconds, cranking cycle stops, overcrank light ON. | Check for dirty fuel filters and replace if necessary. (See MAINTENANCE section). Check for dirty or plugged air filters and replace if necessary. (See MAINTENANCE section) | |
| Low oil pressure shutdown. | Check oil level and replenish if necessary. Contact an Onan Distributor if oil level is correct. | |
| High engine temperature shutdown. | Check coolant level of radiator and heat exchanger sets and replenish if necessary. Check for slipping drive belts or for obstructions to the airflow. Check water flow valve on city water cooled sets and adjust if necessary. Contact an Onan Distributor or the engine manufacturer if none of the above. | |
| Overspeed shutdown. | Check the governor and throttle linkage for binding and freedom of movement. Check wire connections on electronic governor. Contact an Onan Distributor or the engine manufacturer if linkage is not at fault. | |
| Overspeed light on, no shutdown. | Engine monitor board or sensor malfunction. Contact an Onan Distributor. | |
| The generator set has stopped under load. | Move the Run-Stop-Remote Switch or the remote starting switch to the Stop position. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Indicates possible overspeed condition. Check the governor and throttle linkage for binding and freedom of movement. Check electronic governor connections. Contact an Onan Distributor or the engine manufacturer if linkage is not at fault.. See the table for the matching fixes.
Documented causes: . Check oil level and replenish if necessary. Check coolant level of radiator and heat exchanger sets and replenish if necessary. Check for slipping drive belts or for obstructions to the airflow. Check water flow valve on city water cooled seis and adjust if necessary. Contact an Onan Distributor or the engine manufacturer if none of the above.. See the table for the matching fixes.
Documented causes: . Check for dirty fuel filters and replace if necessary. (See MAINTENANCE section). Check for dirty or plugged air filters and replace if necessary. (See MAINTENANCE section). See the table for the matching fixes.