Service Manual

7. Troubleshooting10-2019
153A062J683 (Issue 1) Copyright © 2019 Cummins Inc.
• Air fuel mixture
• Exhaust system
• Demand regulator
• Throttle plate
• Alternator windings
• Wire connections
Diagnosis & Repair:
1. Check the last fault recorded.
• If this fault has not been repaired, troubleshoot that fault.
2. Measure the AC current while running the generator set with loads.
• Identify faulty or short cycling loads.
3. Disconnect the generator set control P1 connector.
4. Verify that the P1 pin sockets are fully inserted and inspect the pin socket
condition for corrosion and acceptable condition of contact wipers. To check
contact wipers, use one of the devices below:
• A mating pin connector
• A pin gauge the same size as the mating control connector pin (0.045 in)
• Any suitable device that will not damage the inside contact wipers of the
pin socket
If necessary:
• Clean, repair or replace any pin sockets.
• Fully insert any partially inserted pin sockets.
5. Inspect the condition of P1 pins on the control board. If they are damaged or
severely corroded, clean or repair if possible, or replace the control board.
6. When reconnecting the harness plug to the connector, ensure that the pair are
fully seated next to each other.
7. Reconnect the P1 connector and test-run the generator set for fault occurrence.
8. Check for a blocked or damaged exhaust system.
• Repair or replace exhaust components if necessary.
9. Propane models only:
a. When ambient temperatures are less than 40 °F (34.4 °C), vapor
withdrawal propane tanks should be at least half full to provide the proper
vaporization rate.
b. Propane having more than 2.5% butane will not vaporize in ambient
temperatures at less than 32 °F (0 °C); use HD-5 grade propane.
c. Verify tank level and fuel line conditions.