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 MANUALSFORD1997ESCORT L4-122 2.0L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSVEHICLE SPEED SENSORDESCRIPTION AND OPERATION
1997 Ford Escort L4-122 2.0L SOHC
Vehicle Speed Sensor: Description and Operation
1997 Ford Escort L4-122 2.0L SOHCSECTION Description and Operation
Vehicle Speed Sensor (VSS):
PURPOSE
The Vehicle Speed Sensor (VSS) generates a waveform with a frequency that is proportional to the speed of the vehicle.
OPERATION
How The Signal Is Generated
If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency.
How The Signal Is Used
The Powertrain Control Module (PCM) uses the frequency signal generated by the VSS to control such parameters as fuel injection, ignition timing, transmission / transaxle shift scheduling and torque converter clutch scheduling.
CONSTRUCTION
The VSS is a variable reluctance or hall effect type sensor.
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.