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 MANUALSCHEVROLET1995S10/T10 P/U 2WD L4-2.2L VIN 4REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSVEHICLE SPEED SENSORTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICS
1995 Chevrolet S10/T10 P/U 2WD L4-2.2L VIN 4
Component Tests and General Diagnostics
1995 Chevrolet S10/T10 P/U 2WD L4-2.2L VIN 4SECTION Component Tests and General Diagnostics
The Vehicle Speed Sensor, mounted to the transmission, produces an AC signal in the form of a sine wave. The frequency of this sine wave is proportional to the speed at which the transmission rotates. The Speed at which the transmission rotates is proportional to tile speed of the vehicle.
For PCM equipped vehicles, the A/C signal produced by the Vehicle Speed Sensor is amplified and converted to a square wave by the Vehicle Speed Sensor Buffer. The square wave signal is supplied to the PCM, Cruise Control Module, EBCM, Transfer Case Control Module and Speedometer by the Vehicle Speed Sensor Buffer. The Vehicle Speed Sensor Buffer produces the square wave by opening and closing internal solid state switches to ground. For VCM equipped vehicles, the Vehicle Speed Sensor supplies a square wave directly to the VCM and the VCM supplies a signal to the Speedometer.
For PCM equipped vehicles, tile square wave to the PCM is at a rate of 2000 pulses per mile while the other components see a square wave at 4000 pulses per mile. The PCM, Cruise Control Module and Speedometer internally convert the number of pulses per mile per second to determine vehicle speed. For VCM equipped vehicles. the VCM sends a square wave to the Speedometer at a rate of 4000 pulses per mile.
The Vehicle Speed Sensor Buffer is matched to the vehicle based on transmission, final drive ratio and tire size. It is important to ensure that the correct Vehicle Speed Sensor buffer is installed in tile vehicle if replacement is necessary.
For PCM equipped vehicles, the A/C signal produced by the Vehicle Speed Sensor is amplified and converted to a square wave by the Vehicle Speed Sensor Buffer. The square wave signal is supplied to the PCM, Cruise Control Module, EBCM, Transfer Case Control Module and Speedometer by the Vehicle Speed Sensor Buffer. The Vehicle Speed Sensor Buffer produces the square wave by opening and closing internal solid state switches to ground. For VCM equipped vehicles, the Vehicle Speed Sensor supplies a square wave directly to the VCM and the VCM supplies a signal to the Speedometer.
For PCM equipped vehicles, tile square wave to the PCM is at a rate of 2000 pulses per mile while the other components see a square wave at 4000 pulses per mile. The PCM, Cruise Control Module and Speedometer internally convert the number of pulses per mile per second to determine vehicle speed. For VCM equipped vehicles. the VCM sends a square wave to the Speedometer at a rate of 4000 pulses per mile.
The Vehicle Speed Sensor Buffer is matched to the vehicle based on transmission, final drive ratio and tire size. It is important to ensure that the correct Vehicle Speed Sensor buffer is installed in tile vehicle if replacement is necessary.
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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.