Ford CSG 875-6005A Engine Engine

• 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.
• 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.
• OVERCRANK lamp lights and engine stops cranking.
  Cause: Possible fuel or ignition system problem.
  Fix: A. Check fuel leaks, or plugged fuel lines b. Check for dirty fuel filter and replace if necessary c. Check for dirty or plugged air filter and replace if necessary d. Check for loose connections in the ignition primary, ignition 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.
• No AC output voltage.
  Fix: Field breaker is tripped. Reset breaker. Contact an Onan Dealer or Distributor if voltage build up causes breaker to trip.
• LO ENG TEMP lamp lights.
  Fix: Indicates engine coolant heater is not operating or is not circulating coolant. (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.) a. Coolant heater not connected to power supply. Check for blown fuse or disconnected heater cord and correct as required. b. Check for low coolant level and replenish if required. Look for possible coolant leakage points and repair as required. c. Contact an Onan Dealer or Distributor if none of the above.
• Leaks at exhaust system connections, welds, gaskets, and joints
  Fix: Inspect visually and audibly for leaks; correct immediately. If detected, shut down generator set and repair any leaks immediately.
• Leaking fuel supply lines, filters, or fittings
  Fix: Shut down generator set and have them corrected immediately
• Green RUN lamp does not light following engine start-up.
  Fix: Indicates possible Start/Disconnect relay failure. Contact an Onan Dealer or Distributor for assistance.
• Fault lamp lights but no fault exists.
  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: 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.
• Engine Starts from generator control panel but will not automatically or remote panel.
  Fix: Remote circuit breaker is tripped. Reset breaker and restart. Contact an Onan Dealer or Distributor if breaker trips after resetting.
• Engine runs and then shuts down, OVERSPEED lamp lights.
  Cause: Engine has exceeded normal operating speed.
  Fix: Contact an Onan Dealer or Distributor for service.
• Engine fails to start or starts, runs and then stops
  Fix: Refer to Troubleshooting charts in the Operator’s Manual
• 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 5 procedure.
• 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.

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

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