PLATE 6E1450 - Caterpillar

Use this procedure in order to troubleshoot a problem with the fuel filters or use this procedure if the following event codes are active.
Table 1
Event Codes
CDL Codes and Description Conditions which Generate this Code System Response
E390(1) Fuel Filter Restriction For the secondary fuel filters, the difference between the filtered fuel pressure and the unfiltered fuel pressure is greater than the trip point pressure. The code is logged.
E390(2) Fuel Filter Restriction
E1129(1) Fuel Filter (suction side) Restriction For the primary fuel filters, the difference between the filtered fuel pressure and the unfiltered fuel pressure is greater than the trip point pressure. The code is logged. Probable Causes
Diagnostic codes and event codes
Fuel filter element is plugged
Sensor problem
Sensor circuit component problemRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.
Table 2
Troubleshooting Test Step Value Result
1. Check for Codes
A. Connect Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Download the "Product Status Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
C. Determine if the diagnostic trouble code that directed to this procedure is present.
D. Look for active diagnostic codes that are associated with the system for the event code that directed to this procedure.
E390
E1129
Result: An associated code is present.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: An E390 or E1129 code is present.
Proceed to the next step.
Result: No active codes
STOP
2. Replace the Fuel Filter
A. Replace the appropriate fuel filter elements for the code.
B. Prime the fuel system. Refer to the Operation and Maintenance Manual for information.
C. Restart the engine and check for an active event code for the filter that was changed.
Filter
Result: After starting the engine, the event code is no longer active for the filter that was changed.
STOP
Result: After starting the engine, the event code remained active for the filter that was changed
Proceed to the next step.
3. Check the Fuel Pressure Sensors
A. Use Cat ET to compare the values for the following parameters while the engine is OFF:
- Unfiltered Fuel Pressure (abs)
- Filtered Fuel Pressure (abs)
Both parameters should read atmospheric pressure.
Parameter
value
Result: A sensor does not read atmospheric pressure while the engine is off.
Repair: Troubleshoot the sensor circuit.
Proceed to the next step.
4. Inspect Sensor Circuit Components
A. Inspect the sensor, wiring, and connectors for damage and corrosion. Refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to intermittent electrical problems.
Circuit
problem
Result: A circuit component is damaged or corroded.
Repair: Repair or replace the circuit component.
Result: A circuit component is not damaged or corroded.
Repair: Replace the sensor.