Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2000 Chevrolet Express 3/4 Ton Van V8-305 5.0L VIN M SFIFACTORY OEM SERVICE PROCEDURE
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.
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.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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