The VSS is located on the transmission and sends a pulsing voltage signal to the ECM which is converted to miles per hour. This sensor mainly controls the operation of the TCC system, shift light, cruise control and activation of the EGR system.
- To test the VSS, backprobe the VSS terminals with a high impedance voltmeter (set to the AC voltage scale).
- Safely raise the entire vehicle using jackstands, so the wheels can rotate freely. Make absolutely sure the vehicle is stable.
- Start the vehicle, and place it in gear.
- Verify that the VSS voltage increases as the drive speed increases.
- If the VSS does not produce any AC voltage, or the voltage does not change according to vehicle speed, it can be considered faulty.
REMOVAL & INSTALLATION
See Figure 1
- Disconnect the negative battery cable.
- Raise and safely support the vehicle.
- Detach the VSS lead from the transaxle.
- If necessary, unfasten the governor housing bolts, then remove the housing.
- Unfasten the bolt or screw and retainer, then remove the VSS assembly from the vehicle. Remove and discard the O-ring.
- Lubricate a new O-ring with sychromesh transaxle fluid part no. 12345349 or equivalent, then install on the sensor.
- Install the VSS assembly, then secure with the retainer and bolt/screw.
- If removed, install the governor housing and secure with the retaining bolts.
- Attach the VSS lead to the transaxle.
- Carefully lower the vehicle.
- Connect the negative battery cable.