C27 Engine for the AD55B Underground Articulated Truck Fuel Filter Is Restricted Caterpillar


Fuel Filter Is Restricted
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1.1. Probable Causes
2.1. Recommended Actions
3.2. Fuel Filter Element
4.2. Electrical Connector

The Electronic Control Module (ECM) detects an abnormal fuel filter differential pressure.

Use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes and the default trip points for this code. You must access the monitoring system on AVSpare Electronic Technician (ET) in order to view the current trip point for this code.

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.    
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 engine power. The code is logged.    

Probable Causes

  • Fuel filter element

  • Electrical connector

Recommended Actions

Fuel Filter Element

  1. Replace the fuel filter element.

  1. Restart the engine.

  1. 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.

Electrical Connector

Check all electrical connectors between the ECM and the sensor. Refer to Troubleshooting, "Electrical Connectors - Inspect".

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