DP - Testing Notes
NOTE: You should enter this Pinpoint Test only when you have been directed here from Quick Test or Pinpoint Test TG.REMEMBER
This Pinpoint Test is intended to diagnose only the following:
- VSS Harness circuits
- Vehicle Speed Sensor
- Processor assembly
DESCRIPTION
The Vehicle Speed Sensor (VSS) is a variable reluctance sensor that generates a waveform with a frequency that is proportional to vehicle speed. When the vehicle is moving slowly, the sensor produces a low frequency signal. As the vehicle speed increases, the sensor produces a higher frequency signal. The processor uses this signal to control fuel injection, ignition timing and transmission/transaxle shift points.