The Vehicle Speed Sensor (VSS) is a magnetic pick-up that sends a signal to the Powertrain Control Module (PCM). The sensor measures the rotation of the transmission and the PCM determines the corresponding vehicle speed. A faulty speed sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms.
- Overheated transmission
- Increased emissions
- Poor fuel economy
- Stalling on deceleration
- Improper shift points
- Cruise control inoperative
- Turn the ignition switch to the OFF position.
- Disengage the wiring harness connector from the VSS.
- Using a Digital Volt-Ohmmeter (DVOM), measure the resistance (ohmmeter function) between the sensor terminals. If the resistance is 190–250 ohms, the sensor is okay.
The VSS is located half-way down the right-hand side of the transmission assembly.
- Apply the parking brake, block the rear wheels, then raise and safely support the front of the vehicle on jack stands.
- From under the right-hand side of the vehicle, disengage the wiring harness connector from the VSS.
- Loosen the VSS hold-down bolt, then pull the VSS out of the transmission housing. To remove the VSS, detach the wiring harness connector from it . . . then remove the hold-down bolt and bracket. . . and slide the sensor out of the transmission case
- To install:
- If a new sensor is being installed, transfer the driven gear retainer and gear to the new sensor.
- Ensure that the O-ring is properly seated in the VSS housing.
- For ease of assembly, engage the wiring harness connector to the VSS, then insert the VSS into the transmission assembly.
- Install and tighten the VSS hold-down bolt to 62–88 inch lbs. (7–10 Nm).
- Lower the vehicle and remove the wheel blocks.