SUPPORT AS 5N7906 - Caterpillar

Use this procedure in order to troubleshoot the following event code.
Table 1
Event Code
Description Conditions which Activate the Code System Response
E866 (1) Low Gas Fuel Flow Rate The flow rate that is computed by the valve does not match the fuel demand. The alarm output is activated. The code is logged. Probable Causes
High fuel temperature
Faulty gas pressure regulator or low fuel supply pressure
Obstructions in the fuel supply
Inadequate fuel energy content or moisture in the gasRecommended Repairs
Check the Fuel Temperature
Measure the temperature of the gas that is entering the fuel metering valve. Compare the measurement to the reading for the fuel temperature on the Caterpillar Electronic Technician (ET). Check Cat ET for a "E223 (1) High Gas Temperature" event code.If the temperature on Cat ET is different, determine the reason for the faulty signal from the fuel metering valve.If the fuel temperature is high, determine the cause of the high fuel temperature. Check for proper operation of the equipment that treats the gas prior to the engine.If there is an active "E223 (1) High Gas Temperature" event code, refer to Troubleshooting, "Fuel Temperature Is High".Make repairs, as needed.Check the Gas Pressure Regulator
Check the outlet pressure from the gas pressure regulator. The fuel metering valve requires a minimum pressure of 10 kPa (1.5 psi) for the gas supply.If the pressure of the gas supply is too low, adjust the gas pressure regulator in order to achieve the correct pressure.If the gas pressure regulator cannot be adjusted to the correct setting, repair the regulator or replace the regulator.Check the Fuel Supply for Obstructions
Check the fuel filter for restriction. Replace the fuel filter, if necessary.Inspect the screen inside the inlet of the fuel metering valve for cleanliness. Clean the screen, if necessary.Inspect the fuel supply lines to the fuel metering valve for obstructions. Clean the lines and make repairs, as needed.Check the Gas Shutoff Valve (GSOV) for proper operation. Verify that the valve is fully open when the valve is energized. Verify that the GSOV does not stick in a partially open position. Repair the GSOV. Replace the GSOV, if necessary.Obtain a Fuel Analysis
If the fuel energy content is too low, the fuel metering valve could demand an excessive supply of fuel.Check Cat ET for a "E230 (1) Fuel Energy Content Set Too High" event code. If the code is present, refer to Troubleshooting, "Fuel Energy Content Problem".Obtain an analysis of the gas in order to determine the LHV. Program the Fuel Energy Content to the actual value of the LHV.If the quality of the gas is not consistent, obtain several analyses over a period of time. Program the Fuel Energy Content to the average value of the LHV.Check the Dryer for the Gas
Check the dryer for the gas for proper operation. Repair the dryer, if necessary.