SEAL-LIP TYPE 6B9669 - Caterpillar

Table 1
Event Code
Code and Description Conditions which Generate this Code System Response
E390(1) Fuel Filter Restriction The difference between the filtered fuel pressure and the unfiltered fuel pressure is greater than the trip point pressure. The delay time for this event code is one hour. The code is logged. The ECM will illuminate the check engine lamp.
E390(2) Fuel Filter Restriction The difference between the filtered fuel pressure and the unfiltered fuel pressure is greater than the trip point pressure. The delay time for this event code is four hours. The engine ECM will derate the engine power. The engine derate is 35 percent. The code is logged.
The ECM will illuminate the check engine lamp. The ECM will pulse the action lamp at a rate of .5 Hz per second. Probable Causes
Fuel Filter Element
Restricted fuel filter elementRecommended Actions
Restricted Fuel Filter Element
Replace the fuel filter element.
Restart the engine.
The delay time for the E390(1) event code is one hour. If the event code becomes active after recently changing the fuel filter, the problem may be electrical. Refer to Troubleshooting, "Fuel Filter Differential Pressure - Test" for the procedure to troubleshoot the circuit.