Service manual

9. Troubleshooting 9-2013
3. Disconnect the generator set control J1 connector, verify that the J1 pins are fully inserted,
and inspect pin condition using the steps below:
• Use the test points of the tester tool #420-0603
• Use a mating pin connector, a pin gauge of the same size (.045") as the mating
control connector pin, or any suitable device that will not damage the inside contact
wipers of the pin socket.
• Insert, repair, or replace pins as necessary.
4. Reconnect the J1 connector and test run the generator set for fault occurrence: repair or
replace pins in the connector as necessary.
5. Measure AC current while running the generator set with loads: identify faulty or short
cycling loads.
6. Measure generator set load capability with a shop load bank (de-rate for altitude and
temperature as necessary).
7. Measure generator set frequency and droop while running.
8. Measure AC frequency while changing the engine rpm to determine if the frequency
response matches engine rpm response: repair the damaged generator drive system as
necessary.
9.29 Generator Set Overload - Fault Code 46
Logic: Current is at or above operational design limit and approaching fault declaration: 13, 15,
22, or 36.
Possible Causes: Loads, wire connections, windings,
Diagnosis & Repair:
1. Verify that the Last Fault is FC 46: Yes, continue diagnosis; No, troubleshoot actual last
fault.
2. Measure AC current and voltage while running the generator set with loads: identify faulty
or short cycling loads or reduce loads as necessary.
3. Measure the generator set load capability with a shop load bank (de-rate for altitude and
temperature as necessary).
4. Disconnect the generator set control J1 connector, verify that the J1 pins are fully inserted,
and inspect pin condition using the steps below:
• Use the test points of the tester tool #420-0603
• Use mating pin connector, a pin gauge of the same size (.045") as the mating control
connector pin, or any suitable device that will not damage the inside contact wipers of
the pin socket.
• Insert, repair, or replace pins as necessary.
5. Reconnect the J1 connector and test run the generator set for fault occurrence: repair or
replace pins in the connector as necessary.
6. Check the air filter for cleanliness; replace the air filter as necessary.
7. Measure steady DC voltage at the fuel solenoid while the generator set is running; repair
wiring as necessary.
104 A030A239 (Issue 10)