Ford LSG 875-6005 Engine

• The FAULT 2 fault lamp lights. Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run FAULT 2
  Cause: The standard undesignated fault functions are programmed to shut down the set when a fault is sensed. 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 FAULT 1 or FAULT 2 fault lamp lights. FAULT 1 or FAULT 2
  Fix: Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run. The standard undesignated fault functions are programmed to shut down 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. Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run.
• The FAULT 1 fault lamp lights. Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run FAULT 1
  Cause: The standard undesignated fault functions are programmed to shut down the set when a fault is sensed. Fault 1 is timed delay. 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.
• SWITCH OFF lamp flashes
  Cause: Start/Stop/Remote switch is in the Stop position which will prevent automatic starting if an automatic transfer switch is used
  Fix: Move the Start/Stop/Remote switch to the Remote position for automatic starting.
• PRE LO OIL PRES lamp lights. Engine continues to operate
  Cause: Engine oil pressure has dropped to 30 psi (207 kPa)
  Fix: 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 5 procedure.
• PRE HI ENGINE TEMP lamp lights. Engine continues to operate
  Cause: Engine has begun to overheat and engine temperature has risen to approximately 205°F (97°C)
  Fix: If engine can be stopped, follow procedures in step 3. Use the following procedures if generator is powering critical loads and cannot be shutdown: Check air inlets and outlets and remove any obstructions to airflow; Open doors or windows in generator area to increase ventilation; Reduce load if possible by turning off non-critical loads.
• OVERCRANK lamp lights and engine stops cranking
  Cause: Possible fuel or ignition system problem
  Fix: Check fuel leaks, or plugged fuel lines and correct as required; Check for dirty fuel filter and replace if necessary (see MAINTENANCE section); Check for dirty or plugged air filter and replace if necessary (see MAINTENANCE section); Check for loose connections in the ignition primary, ignition secondary, or solenoid valve circuits and correct as required; Reset the control and restart after correcting the problem. Contact an Onan Dealer or Distributor for service if none of the above.
• 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.
• LO OIL PRES lamp lights. Engine shuts down
  Cause: Engine oil pressure has dropped to 25 psi (172 kPa)
  Fix: 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 30-55 psi (207 to 380 kPa).
• LO ENG TEMP lamp lights. Set is in standby mode but is not operating. (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.)
  Cause: Engine coolant heater is not operating or is not circulating coolant
  Fix: Check for the following conditions: Coolant heater not connected to power supply. Check for blown fuse or disconnected heater cord and correct as required; Check for low coolant level and replenish if required. Look for possible coolant leakage points and repair as required; Contact an Onan Dealer or Distributor if none of the above.
• HI ENG TEMP lamp lights. Engine shuts down
  Cause: Engine has overheated (engine temperature has risen above 215°F/102°C) or coolant level is low (sets with coolant level sensor)
  Fix: Allow engine to cool down completely before proceeding with the following checks: Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary; Check for obstructions to cooling airflow and correct as necessary; Check for a slipping fan belt and tighten if loose; Reset control and restart after locating and correcting problem. Contact an Onan Dealer or Distributor if none of the above.
• Green RUN lamp lights following engine start-up
  Fix: Indicates all engine systems are normal. No corrective action required.
• Green RUN lamp does not light following engine start-up
  Cause: Possible Start/Disconnect relay failure
  Fix: Contact an Onan Dealer or Distributor for assistance.
• Fault lamp lights but no fault exists, Engine gauges show oil pressure, engine temperature, and frequency (speed) are within normal limits
  Cause: The monitor board or a sensor may be at fault
  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.
• Engine will not crank
  Cause: Possible fault with control or starting system
  Fix: Check for the following conditions: Fault lamp on. Correct fault and reset control; Poor battery cable connections. Clean the battery cable terminals and tighten all connections; Discharged or defective battery. Recharge or replace the battery; Contact an Onan Dealer or Distributor for assistance if none of the above.

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

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.