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.