2005 MY OBD System Operation Summary for Gasoline Engines

The FLI signal is also checked to determine if it is stuck. The PCM calculates the amount of fuel being consumedby accumulating fuel pulse width. (Fuel consumed and fuel gauge reading range are both stored in KAM and resetafter a refueling event or DTC storage.) If the there is an insufficient corresponding change in fuel tank level, aP0460 DTC is set.Different malfunction criteria are applied based on the range in which the fuel level sensor is stuck.In the range between 15% and 85%, a 30% difference between fuel consumed and fuel used is typical. The actualvalue is based on the fuel economy of the vehicle and fuel tank capacity.In the range below 15%, a 40% difference between fuel consumed and fuel used is typical. The actual value isbased on reserve fuel in the fuel tank and the fuel economy of the vehicle.In the range above 85%, a 60% difference between fuel consumed and fuel used is typical. The actual value isbased on the overfill capacity of the fuel tank and the fuel economy of the vehicle. Note that some vehicles can beoverfilled by over 6 gallons.Fuel Level Input Stuck Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0460 – Fuel Level Input Circuit StuckcontinuousNonenot applicableBetween 15 and 85%, monitoring can take from100 to 120 miles to completeTypical Fuel Level Input Stuck check malfunction thresholds:P0460 (Fuel Level Input Stuck):Fuel level stuck at greater than 85%: > 40% difference in calculated fuel tank capacity consumed versuschange in fuel level input readingFuel level stuck at less than 85%: > 40% difference in calculated fuel tank capacity consumed versus changein fuel level input readingFuel level stuck between 15% and 85%: > 60% difference in calculated fuel tank capacity consumed versuschange in fuel level input readingFORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 37 OF 131