Can ProScan monitor fuel consumption?
One feature that is frequently requested is a means of monitoring fuel consumption. I am looking to implement such a feature in the near future, but the task isn’t as simple as many may think. The long term and short term fuel trims cannot be used to calculate fuel consumption. Your vehicle’s computer has an internal table of values that are used to determine how much fuel should be injected based on other sensor readings. One of the most important sensors used to determine fueling is the Mass Air Flow sensor. This sensor tells the computer how much air is entering the engine. The computer looks at this value along with other sensor values such as air temperature, engine RPMs, etc and calculates the estimated fuel required (via lookup table). Now this is where the fuel trims come into play. Your vehicle has oxygen sensors in the exhaust which roughly determine the air/fuel ratio. The O2 sensors provide feedback to the vehicle’s computer and let the computer know how good of a job it is
