Product Manual B

6. Troubleshooting5-2019

Code 2 - Low Oil Pressure Fault

Possible Causes:

• Faulty oil pressure relief valve

• Faulty oil pump

• Faulty switch

• Oil level too low/high

Diagnosis and Repair:

1. Check the oil level.

2. Add or drain oil as necessary.

3. If the previous steps do not resolve the problem, contact your Cummins service

representative for assistance.

Code 4 - Overcrank

Possible Causes:

• Air fuel mixture

• Exhaust system

• Faulty external start command

• Fuel supply

• Ignition system

• Starter

• Wire connections

Diagnosis and Repair:

1. Open any closed fuel valves.

2. Ensure spark plug wires are secured to the spark plugs.

3. Check and service the air filter as necessary.

4. Contact your Cummins service representative for assistance.

WARNING

Some generator set 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 generator set service.

Code 12 - Overvoltage

Possible Causes:

• Generator set loads

• Windings