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 MANUALSGEO1993PRIZM L4-1600CC 1.6L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSVEHICLE SPEED SENSORDESCRIPTION AND OPERATION
1993 Geo Prizm L4-1600cc 1.6L DOHC
Vehicle Speed Sensor: Description and Operation
1993 Geo Prizm L4-1600cc 1.6L DOHCSECTION Description and Operation
Vehicle Speed Sensor Operation:
Function
The Vehicle Speed Sensor (VSS) is an electronic relay that is mounted on the transaxle. As the transaxle turns the VSS, the VSS provides the speedometer with a vehicle speed input (voltage pulses).
ECM Input
This input is used to drive the speedometer. The speedometer then converts this vehicle speed input into a more precise waveform and provides the ECM with its own speed input. The ECM converts this this input into a vehicle speed.
Failure Code
A failure in the TPS sensor circuit should set a Diagnostic Trouble Code (DTC) 42.
RENDER: 1.0x
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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.