P0178 Ford

Ford P0178 OBD-II Trouble Code Definition:

P0178 Fuel Composition Sensor Circuit Low Frequency

P0178 FordĀ OBD-II Trouble CodeDescription:

OBD Trouble Code P0178
Fuel Composition Sensor Circuit Low
What does the code mean? OBD-ii Code P0178 definition:
Fuel Composition Sensors are used to determine the amount of ethanol alcohol in the gasoline. Normally, a gasoline engine should not have more than 10% ethanol alcohol in the fuel for proper operation. Some vehicles have a flexi-fuel system on them that allow them to run on up to 85% ethanol alcohol in the fuel. The fuel composition sensor sends a frequency modulated signal to the engine controller which is proportional to the alcohol content of the fuel. The injector pulse width and the ignition timing are modified for the increased alcohol content. It takes almost twice the amount of alcohol compared to gasoline to produce the same power.
Symptoms Sumptoms of OBD code P0178
– Engine Light ON (or Service Engine Soon Warning Light)
Causes Causes of the OBD-II code P0178
– Open or short in FF sensor VPWR circuit – Open in battery ground to FF sensor circuit – Open in FF sensor signal circuit – Short to ground in FF sensor signal circuit – Fuel contamination – Short to VPWR in FF sensor batte