Onan MDKBH Series, Service Manual

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TABLE 11-1. TROUBLESHOOTING GENSET FAULTS (CONT.)
@@@@ Some genset service procedures present hazards that can result in severe personal
injury or death. Only trained and experienced service personnel with knowledge of fuels, electricity,
and machinery hazards should perform genset service. See Safety Precautions.
Accidental or remote starting can cause severe personal injury or death. Before removing a panel or
access door, disconnect the negative (–) cable from the battery to prevent the engine from starting.
WARNING
GOVERNOR OVERLOAD—CODE NO. 22
Control Logic: Maximum allowable time at full-duty cycle was exceeded
Corrective Action: Refer to Pages A-1 through A-3 as appropriate.
1. Reduce the number of appliances running at the same time, especially those with high motor starting
loads such as air conditioners.
2. Check the fuel tank and fill as necessary. (Note: The arrangement of pickup tubes in the fuel supply tank
probably is such that the genset will run out of fuel before the propulsion engines.)
3. Remove combustion air or exhaust system blockages.
4. Prime the engine fuel system for at least 30 seconds (p. 3-3).
5. Check all fuel filters and fittings for fuel and air leaks, tighten as necessary and reprime.
6. Replace the fuel filters and reprime (p. 4-5).
7. Conduct a fuel pump test and replace if necessary (p. 6-4).
8. Check for proper operation of the governor actuator and service as necessary (p. 6-7).
9. Readjust high idle speed (p. 6-10).
10. Service the fuel injectors in accordance with the engine Workshop Manual (p. 6-1).
11. Check fuel injection timing in accordance with the engine Workshop Manual (p. 6-1).
12. Check for proper operation of the internal governor mechanism in accordance with the engine Work-
shop Manual (p. 6-1).
13. Service a worn engine in accordance with the engine Workshop Manual (p. 6-1).
14. Replace the genset controller (p. 9-1).
FAULTY OIL PRESSURE SENDER—CODE NO. 23
Control Logic: Controller sensed grounded sender
Corrective Action: Refer to Pages A-1 throughA-3as appropriate.
1. If loose, tighten the ring terminal on sender E1 (Page 9-6). (This fault will occur if a loose ring terminal
touches grounded metal.)
2. Disconnect connector P1 (black) from genset controller (Page 9-1) and check continuity between
Pin 10 and ring terminal E1-1 . If it is an isolated-ground sender, also check continuity between E1-2
and B– (ground). Repair wiring and connectors as necessary.
3. Test sender E1 and replace as necessary (Page 9-6).
4. Replace the genset controller (p. 9-1).
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