Scion 89413-32010 Sensor, Transmission Revolution

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Above the transaxle, you will find the Vehicle Speed Sensor (VSS). This sensor is a piece of electronic equipment that produces a pulsating voltage whenever the sensor shaft rotates. The PCM then monitors these voltage pulses to help regulate the fuel and ignition systems as well as transaxle shifting. First, take off the air filter housing in order to replace it. After this, remove the electrical connector from VSS. At last, get rid of VSS from transaxle. Replace the 0-ring by removing the 0-ring from speed sensor. Finally, installation is just like removal.

The front sensors are mounted in the steering knuckles, while the rear sensors are mounted in the rear axle assembly. Both types of sensors have tone-rings integrated with the wheel bearings.

The input speed sensor is located on the left side of the transmission, while the output speed sensor is located on the right side. The location of the output speed sensor is the same for both 2WD and 4WD models.

The next step is to remove the VSS from the transaxle.

The rear wheel sensor is pressed into the rear hub, which can be removed for rear wheel bearing renewal. A puller is needed to extract the sensor, and a press is required to fit the new one. Due to the cost of a new sensor and the tools required, this job is best left to a Toyota dealer.

Speed sensors are located at each wheel and generate small electrical pulsations when the toothed sensor rings are turning. They send signals to the electronic controller indicating wheel rotational speed.

The TPS is located on the throttle shaft and monitors the output voltage to alter fuel delivery based on throttle valve angle. A malfunction can cause unstable idle and fuel delivery issues.

The input speed sensor is located on the left side of the transmission, and the output speed sensor is located on the right side.

The single VSS is located on the right side of the transmission extension housing.

To check the sensor output, raise the relevant wheel, disconnect the wiring to the ABS sensor, and connect the meter to it. Then, spin the wheel and check that the output voltage is between 1.5 and 2.0 volts, depending on the speed of the wheel.