Onan

DS2

UnclassifiedCooling

What This Code Means

Engine stops cranking after approximately 75 seconds; Fault lamp lights after cranking; Overcrank diagnostic LED (DS2) is lit; Fault lamp lights immediately after engine starts; No diagnostic LEDs illuminated on startup; Engine shuts down after running for a period; Fault lamp lights and engine shuts down; Low Oil Pressure LED (DS1) is lit; High Engine Temperature LED (DS3) is lit; Fault lamp lights, none of the diagnostic LEDs are lit, and no actual fault exists; Engine stops cranking and fault lamp lights after cranking approximately 75 seconds; Overcrank diagnostic LED (DS2) lit; None of the diagnostic LEDs illuminated; Fault lamp lights and engine shuts down after running for a period; Low Oil Pressure LED (DS1) lit; High Engine Temperature LED (DS3) lit; Fault lamp lights, none of the diagnostic LEDs lit, no fault exists; Fault lamp lights immediately after engine starts with none of the diagnostic LEDs illuminated; Fault lamp lights, none of the diagnostic LEDs lit, and no fault

Possible Causes

  • •Carburetor choke solenoid malfunction
  • •Closed oil pressure sensor
  • •Faulty carburetor choke solenoid operation
  • •Faulty engine monitor board
  • •Faulty high engine temperature sensor
  • •Faulty oil pressure sensor
  • •Fuel supply issues
  • •Fuel supply system issues
  • •Ignition system issues
  • •Impeded coolant flow (city water cooled systems)
  • •Loose fan belts
  • •Low coolant level
  • •Low oil level
  • •Low oil pressure switch feeds fault signal back to the monitor board via terminal block TB11
  • •Malfunctioning carburetor choke solenoid
  • •Oil pressure sensor is closed
  • •Overspeed condition as the engine starts
  • •Restricted air flow through radiator
  • •Restricted coolant flow
  • •Restricted coolant flow (city water cooled systems)
  • •Restricted radiator air flow

Suggested Actions

  1. 1Check Chrysler manual for troubleshooting oil system
  2. 2Check coolant flow (city water cooled systems)
  3. 3Check coolant level
  4. 4Check fan belts for tightness
  5. 5Check for faulty high engine temperature sensor
  6. 6Check for faulty oil pressure sensor
  7. 7Check for overspeed condition as the engine starts
  8. 8Check fuel supply
  9. 9Check fuel supply and ignition systems (see engine manual)
  10. 10Check ignition systems (see engine manual)
  11. 11Check oil level
  12. 12Check operation of carburetor choke solenoid (on units so equipped)
  13. 13Check operation of carburetor choke solenoid (units so equipped)
  14. 14Check radiator for free air flow
  15. 15Disconnect leads from TB11 terminals 29, 30, and 31
  16. 16If fault lamp lights with leads disconnected and no diagnostic LEDs are lit, replace the engine monitor board
  17. 17Reconnect leads
  18. 18See engine manual for troubleshooting cooling system
  19. 19Troubleshoot cooling system per engine manual
  20. 20Troubleshoot oil system per Chrysler manual

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