DEFLECTOR 1946690 - Caterpillar

Table 1
CDL Codes and Description Comment
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.
E390(2)
Fuel Filter Restriction
E1129 (1)
Fuel Filter (suction side) Restriction The code is logged.
For the primary fuel filters, the difference between the filtered fuel pressure and the unfiltered fuel pressure is greater than the trip point.
E1129 (2)
Fuel Filter (suction side) Restriction Probable Causes
Diagnostic codes and event codes
Fuel filter element is pluggedRecommended 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. Determine if the diagnostic trouble code that directed to this procedure is present.
C. Look for active diagnostic codes that are associated with the system for the event code that directed to this procedure.
E390 or 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Result: After starting the engine, the event code is no longer active for the filter that was changed.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