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 MANUALSCHEVROLET1993G 10 VAN V6-262 4.3L VIN ZREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSVEHICLE SPEED SENSOR CHECK
1993 Chevrolet G 10 Van V6-262 4.3L VIN Z
Vehicle Speed Sensor Check
1993 Chevrolet G 10 Van V6-262 4.3L VIN ZSECTION Vehicle Speed Sensor Check
VSS Check (2WD):
VSS Circuit:
Circuit Description:
The speed sensor circuit consists of a magnetic induction type sensor, a vehicle speed sensor buffer module and wiring. Gear teeth pressed on the output shaft induce an alternating current in the sensor. This signal is transmitted to the buffer. The buffer compensates for various axle ratios and converts the signal into a square wave for use by the speedometer, cruise control, antilock brakes and PCM. The buffer sends two different signals to the PCM. The 437 circuit relays the transmission output speed which is used to control shift points, line pressure, TCC, DTC 24 and DTC 72. The 1716 circuit relays the vehicle speed which is used to control engine operating functions and DTC 16.
Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks the vehicle speed sensor signal to the PCM.
2. This test checks the vehicle speed sensor signal at the buffer module.
3. This test checks the vehicle speed sensor signal directly,
Diagnostic Aids:
Check all connections at the transmission pass-thru connector Refer to PCM Intermittent Diagnostic Trouble Codes or Performance."
RENDER: 1.0x
NO RELATED
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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.