If the speedometer and odometer are not working in your 1990 Buick LeSabre even after replacing the Vehicle Speed Sensor (VSS), there could be several other potential causes for the issue. Here are some additional steps you can take to diagnose and potentially resolve the problem:
Check Wiring and Connectors: Inspect the wiring and connectors related to the speed sensor and the instrument cluster. Look for any signs of damage, corrosion, or loose connections that may be disrupting the signal between the sensor and the cluster.
Inspect the Instrument Cluster: There could be a problem with the instrument cluster itself, such as a faulty speedometer or odometer gauge. It might be worth having the cluster tested or repaired by a professional instrument cluster repair service.
Test the VSS Signal: Use a diagnostic scan tool capable of reading live data to check if the VSS is sending a signal to the vehicle's computer. The scan tool should display the vehicle speed data when the car is moving. If there's no signal, the VSS or its wiring might still be the issue.
Verify Vehicle Grounds: Electrical issues can sometimes be caused by poor grounds. Check and clean all the ground connections related to the speed sensor and instrument cluster.
Check for Damaged Tone Ring: Some vehicles have a tone ring or reluctor wheel attached to the wheel hub or transmission. The VSS reads the teeth on this ring to determine vehicle speed. A damaged or missing tone ring can affect speed sensor readings.
Inspect the Speedometer Drive Gear: In older vehicles, the speedometer is driven by a mechanical gear attached to the transmission. If this gear is worn or damaged, it can result in inaccurate speedometer readings or no readings at all.
Test the Vehicle Speed Sensor: While you mentioned that the VSS has been replaced, it's possible to get a faulty or incompatible replacement. Test the new VSS with a multimeter to verify its functionality.
Check for Other Faulty Sensors: Although you mentioned no codes, other sensors related to the transmission or vehicle speed (e.g., Output Shaft Speed Sensor) could affect the speedometer and odometer readings.
Sep 12, 2007 at 7:14 PM
