Where is the speed sensor located on a Volkswagen Jetta?
The VSS is located at the rear of the transmission, right over the left side axle. After removing the shift cable bracket, pull the heat shield blanket (green arrow) up and off the VSS.
What does the output speed sensor control?
The output speed sensor measures how fast a vehicle moves and sends that information to other vehicle systems. The transmission control unit uses the speed to determine when to change gears, adjust the torque converter and display the vehicle’s speed in the speedometer.
How does the output shaft speed sensor work?
Diagnostic / Repair Steps. Output shaft speed sensor – The OSS sensor operates by passing an electrical current through the sensor, as the reluctor ring or gear on the end of the transmission output shaft rotates, the voltage changes in relation to the speed.
Which is the first sensor on the transmission shaft?
The first is known as the input shaft speed (ISS) sensor. As described, this sensor is used to monitor the speed of the transmission’s input shaft. The other sensor is the output shaft speed (OSS) sensor.
Can a bad speed sensor affect shift timing?
Harsh or improper shifting. Without a valid speed signal from these sensors, the PCM will not be able to correctly control the shifting of gears within the transmission. This may cause the transmission to shift roughly or more quickly than normal. It’s also common that a problem with these sensors can impact the shift timing,…
How are speed sensors used in a car?
The transmission speed sensors are used to calculate the actual gear ratio of the transmission while in use. There are generally two speed sensors that work in conjunction to provide accurate transmission data to the vehicle’s powertrain control module. The first is known as the input shaft speed (ISS) sensor.