PLATE AS 3896280 - Caterpillar

The Electronic Control Module (ECM) detects fuel filter differential pressure that is above the trip point. Information on default settings and ranges for this event can be found in Troubleshooting, "Event Codes".System Response:The ECM will log the event. Possible Performance Effect:NoneTroubleshooting:
There may be a problem with the fuel system.
There may be a problem with the filtered fuel sensor or the unfiltered fuel sensor.Test Step 1. Check for "ACTIVE" Diagnostic Codes
Start the Caterpillar Electronic Technician (ET).
Check for any active diagnostic codes or logged diagnostic codes. Expected Result:There are no diagnostic codes that are present.Results:
OK - There are no diagnostic codes that are present. Proceed to Test Step 2.
Not OK - There are diagnostic codes that are present.Repair: Repair the diagnostic codes that are present. Refer to the appropriate topic in the "Troubleshooting With a Diagnostic Code" section of this manual. Ensure that the repair eliminates the problem.STOPTest Step 2. Perform a Check of the Fuel System
Check the fuel tank for foreign objects which may block the fuel supply. Prime the fuel system if you perform any of the following procedures:
Replacing the fuel filters
Working on the low pressure fuel supply circuit
Replacing fuel injectors
Prime the fuel supply circuit with the hand priming pump and by cranking the engine in 30 second cycles. After you crank the engine, stop for two minutes. This will allow the starting motor to cool. Loosen the vent plug on the fuel return. The plug is located on the rear upper left side of the engine block. Hand prime the engine again if air in fuel continues. A sight glass in the supply line is helpful in diagnosing air in the fuel.
Cold weather adversely affects the characteristics of the fuel. Refer to the Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation. Check the fuel pressure while the engine is cranking. Check the fuel pressure at the filter. If the pressure is low, check for plugged fuel filters. If the fuel pressure is still low, check the following items: fuel transfer pump, fuel transfer pump coupling and fuel pressure regulating valve. Check for a combustion problem. Expected Result:There are no problems with the fuel system.Results:
OK - There may be an intermittent problem.Repair: Monitor the operation of the engine. Repair the problem. Ensure that the repair eliminates the problem.STOP
Not OK - There are problems with the fuel system.Repair: Repair the problem. Ensure that the repair eliminates the problem.STOP