Cummins/Onan E140 troubleshooting: 10 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan E140 — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Symptom | Remedy |
|---|---|
| The engine fails to crank (electric start engines). | A. Release the clutch (if so equipped). b. Clean and tighten the positive (+) and negative (–) battery cable connections at the battery and the engine. c. Recharge the battery. Refer to the equipment or battery manufacturer’s recommendations. |
| The engine cranks slowly (electric start), or the recoil starter is hard to pull. | A. Release the clutch (if so equipped). b. If electric start, clean and tighten the positive (+) and negative (–) battery cable connections at the battery and the engine. c. If electric start, recharge the battery. Refer to the equipment or battery manufacturer’s recommendations. d. Change engine oil to oil having the proper viscosity for the ambient temperature. See Table 1. |
| The engine cranks but fails to start. | A. Check the fuel tank and fill if necessary. b. Open any closed fuel shut off valve. c. Check engine oil level and add oil as necessary. d. Reconnect and reclamp the choke and throttle cables, if necessary. See Adjustments. e. Service the air cleaner. f. Replace the fuel filter(if provided). g. Inspect and clean or replace the spark plug and re-gap it. |
| The engine runs and then stops. | A. Check the fuel tank and fill if necessary. b. Check the engine oil level and add oil as necessary. Drain excess oil if the level is above the dipstick Full mark. c. Reconnect and reclamp the choke and throttle cables, if necessary. See Adjustments. |
| The engine exhausts black smoke. | A. Service the air cleaner. b. Reconnect and reclamp the choke and throttle cables, if necessary. See Adjustments. |
| Dizziness | Get out into fresh air immediately, shut down the unit and do not use it until it has been inspected. |
| Vomiting | Get out into fresh air immediately, shut down the unit and do not use it until it has been inspected. |
| Muscular Twitching | Get out into fresh air immediately, shut down the unit and do not use it until it has been inspected. |
| Weakness and Sleepiness | Get out into fresh air immediately, shut down the unit and do not use it until it has been inspected. |
| Inability to Think Coherently | IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the engine and do not operate it until it has been inspected and repaired. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.