There VSS operations consists of 4 main items.
1 VSS unit.
2. Wiring Circuit
3. Meter gear assy.
Since the speedometer is intermittently working, the VSS and wiring are more likely to be the cause.
Test power first.
Unplug VSS wire socket.
Turn Ignition switch ON
Check voltage between
1. YellowBlue and Black = Battery voltage
2. Yellow/White and Black = 5 v
3. Black = ground.
To test VSS,
Raise one wheel off the ground.
With VSS socket plugged in, attach a volt meter to Yellow/White and ground.
Turn ignition switch ON
Slowly rotate the wheel that is off the ground.
The voltmeter should indicate pulsing voltage.
If there is pulsing, the VSS is working but you have to remember that the speedometer is intrmittently not working so the VSS might be pulsing now and not later.
If you can get the voltmeter hooked up and test drive the vehicle, once the sppedometer stops working, the pulsing is still available, then you need to replace the speedometer. If no pulse then the VSS is bad.
Saturday, June 21st, 2008 AT 11:27 PM