FAULT CODE 4

Possible Causes

• •Broken or loose wires
• •Grounded or shorted S6 switch leads
• •Low oil level
• •Loose hose
• •Loose drain fittings
• •Low coolant level
• •Grounded sender lead
• •Shorted sender lead
• •Abnormal coolant temperature inlet/outlet of radiator
• •Blocked air flow
• •Faulty pressure cap
• •Temperature sender grounded
• •Broken sender lead
• •Loose sender lead
• •Low oil pressure
• •Pressure sender open
• •Low battery voltage
• •Fuel supply issue
• •Faulty governor actuator operation
• •Incorrect field resistance

Suggested Actions

1. 1Check battery voltage
2. 2Check fuel supply
3. 3Check governor actuator operation
4. 4Verify control plugs are fully seated
5. 5Verify field sense and quad leads are fully seated in connector to control
6. 6Check AC output
7. 7Check field voltage
8. 8Check for broken or loose wires
9. 9Check field windings
10. 10Check proper field resistance reading (open to ground)
11. 11Check brush condition and contact
12. 12Check proper quadrature resistance reading (open to ground and main windings)
13. 13Check cylinder compression
14. 14Check raw water supply
15. 15Check raw water flow
16. 16Check for grounded or shorted S6 switch leads
17. 17Clean contaminated area
18. 18Check oil level
19. 19Check for loose hose or drain fittings
20. 20Check for leaks while running with dye in oil

Related Onan Fault Codes