Short Term Fuel Trim (FT) BN 1

RANGE (0-255 COUNTS):
The Short Term FT was formerly the fuel integrator. The Short Term FT represents a short term correction to the fuel delivery by the VCM in response to the amount of time the HO2S voltage spends above or below the 450 mV threshold. A HO2S voltage reading below 450 mV indicates a lean air to fuel mixture. If the HO2S voltage averages below the 450 mV threshold, the Short Term FT counts increase in order to add fuel. If the HO2S voltage averages above the 450 mV threshold, the VCM reduces the fuel delivery in order to compensate for the indicated rich condition.

RANGE (PERCENTAGE OF COMPENSATION REQUIRED):
The Short Term FT was formerly the fuel integrator. The Short Term FT represents a short-term correction to the fuel delivery by the VCM in response to the amount of time the HO2S voltage spends above or below the 450 mV threshold. As fuel compensation is required, the difference between commanded Short Term FT and 128 counts will be displayed as a percentage.