Town Car V8-4.6L VIN W (1997)
Vehicle Speed Sensor Signal: Description and Operation
The vehicle speed sensor (VSS) is located on the transmission and is used to establish vehicle speed.
The output current to the power steering control valve actuator is a function of vehicle speed and the steering wheel rotation rate.
When vehicle speed is less than 16 km/h (10 mph), the power steering control valve actuator output current is less than 60 mA and full power steering
assist is provided.
As vehicle speed increases to 40 km/h (25 mph), the current increases linearly to 300 mA.
As vehicle speed continues to increase up to 142 km/h (88 mph), the current increases linearly to 590 mA. The current then remains constant at 590 mA
for vehicle speeds greater than 142 km/h (88 mph).
Conversely, as vehicle speeds decrease, the current decreases at the linear rate.
