Onan

00-046

UnclassifiedCooling

What This Code Means

Excessive exhaust smoke under load; Field breaker keeps tripping; High exhaust temperature (Marine); High/Low AC output (Genset); Engine cranks but will not start; Engine unstable (hunting); Engine will not crank; Low AC output; High exhaust temp (Marine); High AC Output (Genset); Low AC Output (Genset); High exhaust temperature; High AC output; High/Low AC Output (Genset); Engine Unstable (Genset Hunts or Surges); Excessive Exhaust Smoke Under Load; Excessive White Exhaust Smoke at Start-up (Warm Engine); High AC output (Genset); Low AC output (Genset); Excess white smoke at start-up (warm)

Possible Causes

  • •Intake air restrictions
  • •Overloaded generator
  • •Incorrect valve settings
  • •Incorrect injection pump timing
  • •Incorrect AC output voltage
  • •Broken or loose wires
  • •Faulty exciter stator
  • •Faulty reference transformer T21
  • •Faulty voltage regulator
  • •Improper coolant flow out of exhaust
  • •Faulty exhaust temp switch
  • •Damaged exhaust temp switch
  • •Faulty transformer regulator
  • •Incorrect engine speed
  • •Incorrect voltage adjustment pot setting
  • •Incorrect output lead wiring configuration
  • •Fuel pump malfunction
  • •Loss of B+ voltage at glow plugs
  • •Fuel shutoff solenoid malfunction
  • •Fuel supply issue

Suggested Actions

  1. 1Check intake air restrictions
  2. 2Check for overloaded generator
  3. 3Check valve settings
  4. 4Check injection pump timing
  5. 5Check AC output voltage
  6. 6Check for broken or loose wires
  7. 7Check exciter stator
  8. 8Check reference transformer T21
  9. 9Check voltage regulator
  10. 10Check proper coolant flow out of exhaust
  11. 11Check exhaust temp switch for proper operation
  12. 12Check for damaged exhaust temp switch
  13. 13Check broken or loose wires
  14. 14Check transformer regulator
  15. 15Check engine speed
  16. 16Check voltage adjustment pot setting
  17. 17Check output lead wiring configuration
  18. 18Check fuel pump
  19. 19Check B+ at glow plugs
  20. 20Check fuel shutoff solenoid

Related Onan Fault Codes

00-04700-04800-022100-015200-014400-0102100-0CV22
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