234
UnclassifiedSpeed
What This Code Means
Overspeed - Shutdown; Excitation Fault - Shutdown; Speed Signal Lost - Shutdown
Possible Causes
- •Governor fault
- •Cold engine
- •Single step large block load removal
- •Fuel shut-off coil fault
- •Misadjusted speed adjustment device
- •Fuel Injection Pump fault
- •Voltage sense lead fault
- •Excitation circuit fault
- •Field wiring (X1 and X2) fault
- •Genset not setup to reach required speed
- •Incorrect settings and configurations for genset
- •Damaged magnetic pickup (MPU)
- •Harness / base board fault
Suggested Actions
- 1Refer to PCC1302 troubleshooting guidelines
- 2Perform fault simulation with InPower
- 3Reset / adjust threshold
- 4Adjust speed adjustment device
- 5Monitor engine rpm / Hz with InPower
- 6Reset Control & restart
- 7Check voltage sense lead
- 8Check excitation circuit
- 9Check field wiring (X1 and X2)
- 10Ensure Genset setup to reach required speed manually
- 11Confirm settings and configurations for genset
- 12Inspect/replace damaged magnetic pickup (MPU)
- 13Inspect harness / base board
ASK RUDY ABOUT THIS FAULT
Get a diagnosis walkthrough for 234 on your specific Onan unit — cited to the OEM manual, not a forum guess.
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