Modified Ford LSG-875-6005A Engine

• 9. LO ENG TEMP lamp lights. Set is in standby mode but is not operating.
  Cause: Lamp lights when engine water jacket temperature is 70°F (21°C) or lower. Since the lamp goes out after the engine warms up, there should be no cause for alarm even during initial generator set operation.
• 8. SWITCH OFF lamp flashes.
  Fix: Indicates Start/Stop/Remote switch is in the Stop position which will prevent automatic starting if an automatic transfer switch is used. Move the Start/Stop/Remote switch to the Remote position for automatic starting.
• 2. PRE Hi ENGINE TEMP lamp lights. Engine continues to operate. PRE Hi ENGINE TEMP
  Fix: Indicates engine has begun to overheat and engine temperature has risen to approximately 205°F (97°C). If engine can be stopped, follow procedures in step 3. Use the following procedures if generator is powering critical loads and cannot be shutdown. a. Check air inlets and outlets and remove any obstructions to airflow. b. Open doors or windows in generator area to increase ventilation. c. Reduce load if possible by turning off non-critical loads.
• 10. 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. FAULT 1 or FAULT 2
  Fix: The standard undesignated fauit functions are programmed to shutdown the set when a fault is sensed. Fault 1 is timed delay 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.
• *7. Engine runs and then shuts down, OVERSPEED lamp lights.
  Fix: Indicates engine has exceeded normal operating speed. Contact an Onan Dealer or Distributor for service.
• *6. OVERCRANK lamp lights and engine stops cranking.
  Cause: Indicates possible fuel or ignition system problem.
  Fix: A. Check fuel leaks, or plugged fuel lines and correct as required. b. Check for dirty fuel filter and replace if necessary (see MAINTENANCE section). c. Check for dirty or plugged air filter and replace if necessary (see MAINTENANCE section). d. Check for loose connections in the ignition primary, igntion secondary, or solenoid valve circuits and correct as required. e. Reset the control and restart after correcting the problem. Contact an Onan Dealer or Distributor for service if none of the above.
• *5. LO OIL PRES lamp lights. Engine shuts down NOTE: See also step 6. LO OIL PRES
  Fix: Indicates engine oil pressure has dropped to 25 psi (172 kPa). Check oil level and replenish if low. Reset control and restart. Contact an Onan Dealer or Distributor if oil pressure is not in the range of 40-65 psi (275 to 448 kPa).
• *4. PRE:LO OIL PRES lamp lights. Engine continues to operate. PRE:LO OIL PRES
  Fix: Indicates engine oil pressure has dropped to 30 psi (207 kPa). If engine can be stopped, follow procedures in step 5. If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 9 procedure.
• *3. HI ENG TEMP lamp lights. Engine shuts down. HI ENG TEMP
  Fix: Indicates engine has overheated (engine temperature has risen above 215°F/102°C or coolant level is low (sets with coolant level sensor). Allow engine to cool down completely before proceeding with the following checks: a. Check coolant level and replenish if low. b. Check for obstructions to cooling airflow and correct as necessary. c. Check for a slipping fan belt and tighten if loose. d. Reset control and restart after locating and correcting problem. Contact an Onan Dealer or Distributor if none of the above.
• *14. No AC output voltage.
  Cause: Field breaker is tripped.
  Fix: Reset breaker. Contact an Onan Dealer or Distributor if voltage build up causes breaker to trip.
• *13. Engine will not crank.
  Cause: Indicates possible fault with control or starting system.
  Fix: A. Fault lamp on. Correct fault and reset control. b. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. c. Discharged or defective battery. Recharge or replace the battery. d. Contact an Onan Dealer or Distributor for assistance if none of the above.
• *12. Engine Starts from generator control panel but will not automatically or from a remote panel (Note: The Start/Stop/Remote switch must be in the Remote position for automatic or remote starting).
  Fix: Remote circuit breaker is tripped. Reset breaker and restart. Contact an Onan Dealer or Distributor if breaker trips after resetting.
• *11. Fault lamp fights but n no fault exists, Engine gauges show oil pressure, engine temperature, and frequency (speed) are within normal limits.
  Fix: Reset control. if control will not reset, the monitor board or a sensor may be at fault. Contact an Onan Dealer or Distributor for service.
• *1. Green RUN lamp lights following engine start-up.
  Fix: 1. Indicates all engine systems are normal. No corrective action required.

Compiled from service & troubleshooting documentation across every generator set that uses the Modified Ford LSG-875-6005A.

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