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 MANUALSSATURN1998SL2 L4-1.9L DOHC VIN 7REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSVEHICLE SPEED SENSORDESCRIPTION AND OPERATION
1998 Saturn SL2 L4-1.9L DOHC VIN 7
Vehicle Speed Sensor: Description and Operation
1998 Saturn SL2 L4-1.9L DOHC VIN 7SECTION Description and Operation
VEHICLE SPEED SENSOR
The PCM provides vehicle speed to the instrument cluster for the speedometer by way of the VSS. The vehicle speed sensor (VSS) is a variable reluctance pulse generator that senses the transaxle output. It operates between 0-161 km/h (0-120 mph).
PULSE OUTPUT
The PCM supplies an output to the instrument cluster (speedometer/odometer). This signal is 5000 pulses/mile, representing the divided down vehicle speed. It is a square wave signal from 0 to 12 volts. The correct output to the speedometer depends on the PCM being programmed with the correct tire size. Refer to Vehicle ID table using a Scan tool to be sure tire size option matches the tire size on the vehicle.
The PCM provides vehicle speed to the instrument cluster for the speedometer by way of the VSS. The vehicle speed sensor (VSS) is a variable reluctance pulse generator that senses the transaxle output. It operates between 0-161 km/h (0-120 mph).
PULSE OUTPUT
The PCM supplies an output to the instrument cluster (speedometer/odometer). This signal is 5000 pulses/mile, representing the divided down vehicle speed. It is a square wave signal from 0 to 12 volts. The correct output to the speedometer depends on the PCM being programmed with the correct tire size. Refer to Vehicle ID table using a Scan tool to be sure tire size option matches the tire size on the vehicle.
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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.