DeVille V8-4.6L VIN 9 (1995)
Vehicle Speed Sensor: Component Tests and General Diagnostics
Circuit Operation
The Vehicle Speed Sensor is a gear-driven permanent magnet generator housed in the vehicle's transaxle. This sensor generates a sine wave output with a
frequency proportional to the vehicle speed. The PCM converts this signal to an output that is switched to ground at a frequency of 4000 pulses per mile
at the DK GRN wire (CKT 389), which feeds the Instrument Panel Cluster. The PCM also produces an output at the DK GRN/WHT wire (CKT 817)
which feeds the Speed Sensitive Suspension Module (4.9L Powertrain) or Road Sensing Suspension (RSS) Module (Northstar Powertrain).
System Diagnosis
Refer to the Symptom Table for the appropriate diagnostic procedure(s).
