Service manual

9. Troubleshooting 9-2013
3. Inspect the battery connections and cables for cleanliness, tightness, and damage: clean,
tighten, and repair connections and cables as necessary.
4. Check electrolyte level and hedrometer reading in maintenance type batteries: replace
electrolyte and recharge or replace the battery as necessary.
5. Check the fuel supply pressure coming into the generator regulator and ensure it is within
specification.
6. Verify the condition of the spark plugs and whether they are Cummins Onan branded
plug(s). Non-resistive type plugs sold through non-Cummins Onan channels can cause this
condition. Replace the spark plug(s) if questionable or of non-Cummins Onan origin.
9.11 Genset Warning - Transfer Switch Failed to Transfer
Back to Utility When Utility is Restored - No Fault
Code
Logic: The control does not sense the grounded, utility switch-position wire.
Possible Causes: Transfer switch is faulty, or wire is disconnected or broken.
Diagnosis and Repair:
1. Fix wire connection.
2. Replace a broken wire.
3. Replace a faulty transfer switch.
9.12 Low Oil Pressure Fault - Fault Code 2
Logic: Continuous ground (>= 3 seconds) at control for oil pressure input. The switch opens
with pressure.
Possible Causes: Low/high oil level, faulty switch, faulty oil pressure relief valve, faulty oil
pump
Diagnosis and Repair:
1. Verify that Last Fault is FC 2: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Measure oil level: add or drain oil as necessary.
3. Disconnect the generator set control J1 connector. Verify that the J1 pins are fully inserted
and inspect pin condition, using one of the processes listed below. Then insert, repair, or
replace pins as necessary.
Pin Inspection Processes (use one of the following to inspect the pins):
• Use the test points of the tester tool #420-0603
• Use a mating pin connector
• Use a pin gauge the same size (.045") as the mating control connector pin
• Use any suitable device that will not damage the inside contact wipers of the pin
socket
4. Reconnect the J1 connector and test run the generator set for fault occurrence: repair or
replace pins in the connector as necessary.
90 A030A239 (Issue 10)