DP - Testing Notes

Vehicle Speed Sensor Schematic:

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 Powertrain Control Module (PCM) uses this signal to control fuel injection, ignition timing and transmission/transaxle shift points.

NOTE:
You should enter this Pinpoint Test only when you have been directed here from Diagnostic Routines or from Pinpoint Test TG.

REMEMBER:
This Pinpoint Test is intended to diagnose only the following:

- VSS Harness Circuits

- Vehicle Speed Sensor

- PCM