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.
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HOMESERVICE MANUALSCHEVROLET1991BLAZER FULL SIZE V8-379 6.2L DSLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSVEHICLE SPEED SENSOR SIGNAL BUFFERDESCRIPTION AND OPERATION
1991 Chevrolet Blazer Full Size V8-379 6.2L DSL
Vehicle Speed Sensor Signal Buffer: Description and Operation
1991 Chevrolet Blazer Full Size V8-379 6.2L DSLSECTION Description and Operation
The Vehicle Speed Sensor (VSS) Buffer is a solid-state device that is used to change the signal from the speed sensor to a digital signal. The VSS buffer will change the signal from the speed sensor to a signal containing 4000 pulses per mile for the instrument cluster.
The VSS buffer is matched to the final drive and tire size of each vehicle. It must be replaced with the proper buffer to match the final drive and tire size of that vehicle.
CAUTION: If the final drive or tire size is changed for any reason, the buffer must also be changed to continue to produce an accurate speedometer/odometer reading. The incorrect buffer will also affect the anti-lock brakes, engine control module, and cruise control module.
The VSS buffer is matched to the final drive and tire size of each vehicle. It must be replaced with the proper buffer to match the final drive and tire size of that vehicle.
CAUTION: If the final drive or tire size is changed for any reason, the buffer must also be changed to continue to produce an accurate speedometer/odometer reading. The incorrect buffer will also affect the anti-lock brakes, engine control module, and cruise control module.
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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.