Cummins/Onan KT-1150-G Engine Engine

• Overspeed shutdown. Overspeed
  Fix: Check governor and throttle linkages for freedom of movement.
• Fault lamp lights and engine shuts down after running for a period.
  Fix: Check oil level and replenish if necessary. Check coolant level of radiator and heat exchanger sets and repienish if necessary. Check for slipping drive belts or for obstructions to the air flow. 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.
• Engine stops cranking and fault lamp lights, after cranking approximately 75 seconds.
  Fix: Check for empty fuel tank, fuel system leaks, or plugged fuel supply lines. Correct as required.
• Engine runs, shuts down, cranks for 75-seconds, cranking cycle stops, overcrank light ON.
  Fix: 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)
• Overcrank fault lamp, lights and engine stops cranking after approximately 75-sec'onds.
  Fix: See engine service manual for troubleshooting fuel system. After correcting fault, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset position, depressing Reset button, then to the required running position.
• Low oil pressure shutdown.
  Fix: A. Oil level. Replenish if necessary. b. Sensor. Faulty sensor will shut down engine. c. Refer to engine service manual for troubleshooting guide for oil system.
• High engine temperature shutdown.
  Fix: A. Coolant level. Replenish if necessary. b. City water cooled sets. Check water flow, valves, etc. c. Check sensor; check thermostat. d. Radiator model, check fan belts, radiator for obstructions, etc.
• Fault lamp lights immediately after engine starts.
  Fix: Check for: Overspeed condition as engine starts.
• Voltage regulation poor
  Fix: Check continuity from the junction of Control Rectifiers 3 and 4 to the junction of Control Rectifiers 1 and 2
• The FAULT 1 or FAULT 2 fault lamp lights. Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run.
  Cause: Engine standard undesignated fault functions are programmed to shut down the set when a fault is sensed. Fault 1 is timed delayed while Fault 2 is immediate. The nature of the fault is an optional selection that is determined when the set installation is designed. The undesignated fault functions may also be programmed for non-shutdown or non-time delay.
• The external alarm is activated
  Fix: Check the conditions that may have caused the fault
• The engine does not start.
  Cause: The starter will disengage after a specified period of time and the control will indicate an overcrank fault.
  Fix: Place the Run-Stop-Remote switch in the STOP position and momentarily depress the Reset switch. Wait two minutes for the starter motor to cool and then repeat the starting procedure.
• The engine does not run after a second attempt at starting.
  Fix: Refer to the Troubleshooting section.
• SWITCH OFF lamp flashes. 8
  Fix: Position which will prevent automatic starting if an automatic transfer switch is used. Move the Run/Stop/Remote switch to the Remote position for automatic starting.
• PRE LO OIL PRES lamp lights. Engine continues to operate. 4
  Fix: 4. Indicates engine oil pressure has dropped to 20 psi (138 kPa). If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure. If engine can be stopped, follow procedures in step 5.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan KT-1150-G.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.