ELBOW 0005508 - Caterpillar

The Electronic Control Module (ECM) detects all of the following conditions:
Fuel pressure is in the "Low Fuel Pressure Region" in Illustration 1 for ten seconds.
The engine has been running for at least 60 seconds.
Illustration 1 g01035816
Low fuel pressure map
System Response:The ECM will log the warning. The ECM will transmit a warning to the display in the cab. The ECM will reset the warning when the fuel pressure rises 1 kPa (0.1450 psi) above the low pressure trip line for one second.Possible Performance Effect:
Low powerTroubleshooting:Test Step 1. Replace the Fuel Filter
Replace the fuel filter. Refer to the appropriate procedure in the Operation and Maintenance Manual for the correct procedure.
Start the engine and verify that the event is no longer active. Expected Result:Replacing the fuel filter corrected the problem.Results:
OK - Replacing the fuel filter corrected the problem.STOP
Not OK - Replacing the fuel filter did not correct the problem. Proceed to Test Step 2.Test Step 2. Verify Proper Sensor Installation
Check the installation of the fuel pressure sensor.
Check the wiring of the fuel pressure sensor. Refer to the Electrical Schematic for the proper wiring. Ensure that all of the wires and connectors are properly connected. Expected Result:The sensor is properly installed and the wiring is correct.Results:
OK - The sensor is properly installed. Proceed to Test Step 3.
Not OK - The sensor is not installed properly.Repair: Install the fuel pressure sensor properly. Repair the wiring and/or the connectors to the sensor.Verify that the repair eliminates the problem.STOPTest Step 3. Check for Active Diagnostic Codes
Connect the Caterpillar Electronic Technician (ET) to the service tool connector.
Check for active diagnostic codes that are related to the atmospheric pressure sensor and/or to the turbocharger outlet pressure sensor. Expected Result:There are no diagnostic codes that are related to the atmospheric pressure sensor and/or to the turbocharger outlet pressure sensor.Results:
OK - There are no diagnostic codes. Proceed to Test Step 4.
Not OK - There is a diagnostic code that is related to the atmospheric pressure sensor and/or the turbocharger outlet pressure sensor.Repair: Troubleshoot the diagnostic code before continuing with this procedure.STOPTest Step 4. Check the Status Screen
Place the engine control in the ON mode. The engine should be off.
Monitor the status for "Boost Pressure" and "Fuel Pressure" on Cat ET. Expected Result:"Boost Pressure" and "Fuel Pressure" are less than 10 kPa (2 psi).Results:
OK - The boost pressure and the fuel pressure are less than 10 kPa (2 psi). Proceed to Test Step 6.
Not OK - Boost Pressure - The boost pressure is greater than 10 kPa (2 psi). Proceed to Test Step 5.
Not OK - Fuel Pressure - The fuel pressure is greater than 10 kPa (2 psi). Proceed to Test Step 5.
Not OK - Both - The boost pressure and fuel pressure are greater than 10 kPa (2 psi). Proceed to Test Step 5.Test Step 5. Check the Supply Voltage to the Suspect Pressure Sensor(s)
Place the engine control in the OFF/RESET mode.
Disconnect the suspect sensor(s).
Place the engine control in the ON mode.
Measure the voltage between terminal A (+5V) and