C7.1 Engines For Caterpillar Built Machines Caterpillar

Probable Causes

• Diagnostic codes

• Air Intake

• Electrical connectors

• Fuel supply

Recommended Actions

Diagnostic Codes

Use one of the following methods to check for active diagnostic codes:

• The electronic service tool

• The display on the control panel

Electronic Service Tool

1. Connect the electronic service tool to the diagnostic connector.

2. Check for active diagnostic codes on the electronic service tool.

3. Investigate any active codes before continuing with this procedure. Refer to Troubleshooting, "Troubleshooting with a Diagnostic Code".

Display on the Control Panel

1. Check the display on the control panel for active diagnostic codes.

2. Troubleshoot any active codes before continuing with this procedure. Refer to Troubleshooting, "Troubleshooting with a Diagnostic Code".

Air Intake

1. Check the air filter for blockage or restriction.

2. Check the air intake duct for blockages or restrictions.

Electrical Connectors

1. Check for correct installation of connectors at the following locations:
   • P1 ECM connector

   • P2 ECM connector

   • Connector for the solenoid on the fuel injection pump

2. Refer to Troubleshooting, "Electrical Connectors - Inspect".

3. Inspect the battery cables from the ECM to the battery compartment. Refer to the Schematic Diagram. Inspect the cables and the power relay. Check the power and ground connections to the ECM. Refer to the schematic diagram for more information.

4. Select the "Wiggle Test" from the diagnostic tests on the electronic service tool.

5. Choose the appropriate group of parameters to monitor.

6. Press the "Start" button. Wiggle the wiring harness in order to reproduce intermittent faults.

   Note: If an intermittent fault exists, the status will be highlighted and an audible beep will be heard.

7. Repair any faults and ensure that the symptom has been cleared. If the symptom is still present, refer to "Fuel Supply".

Fuel Supply

1. Visually check the fuel tank for fuel. The fuel gauge may be faulty.

2. Ensure that the fuel supply valve (if equipped) is in the full OPEN position.

3. If the temperature is below 0 °C (32 °F), check for solidified fuel (wax).

4. Check the primary filter/water separator for water in the fuel.

5. Check for fuel supply lines that are restricted.

6. Check that the Electric Fuel Lift Pump (EFLP) is operating. If the EFLP is suspect, refer to Troubleshooting, "Fuel Pump Relay Circuit - Test".

7. Check that the low-pressure fuel lines are tight and secured properly.

8. Check the fuel filters.

9. Check the diesel fuel for contamination. Refer to Systems Operation, Testing, and Adjusting, "Fuel Quality - Test".

10. Check for air in the fuel system. Refer to Systems Operation, Testing, and Adjusting, "Air in Fuel - Test".

11. Ensure that the fuel system has been primed. Refer to Systems Operation, Testing, and Adjusting, "Fuel System - Prime".

12. Check the fuel pressure. Refer to Systems Operation, Testing, and Adjusting, "Air in Fuel - Test".

13. If the fault has not been eliminated, contact the Technical Communicator at a Cat dealer.