Caprice Wagon V8-350 5.7L (1994)
Vehicle Speed Sensor: Component Tests and General Diagnostics
Circuit Operation
The Speed Sensor Circuit consists of a magnetic type sensor and wiring. Gear teeth pressed on the Transmission Output Shaft induce an alternating
current in the sensor. This sensor generates a sine wave output with a frequency proportional to vehicle speed. The Powertrain Control Module (PCM)
converts this signal to an output that is switched to ground at a frequency of 4000 pulses per mile at the DK GRN/WHT wire (CKT 817), which feeds
the Warning Alarm, Power Steering Control Module, Instrument Cluster and Cruise Control Module.
System Diagnosis
Refer to the Symptom Table for the appropriate diagnostic Procedure(s). See: Symptom Related Diagnostic Procedures/- Symptom Table
