Arbadacarba

My Speedometer/Odometer has started acting up on me and I'm trying to diagnose it before I just start throwing money at it.

I've search and determined what the usual suspects are (VSS, Grounds, Cluster, Fuse 15).

But I can't seem to figure out which it is for certain.

I have a question:

What is the proper behaviour of a Speedometer when it is disconected from the VSS?

Mine sits at 30 and when I disconnect the VSS it drops to about 20.

Should it drop to Zero?

Thanks

Arbadacarba

White Smoke

Id guess its your actual cluster bro
So it sits at 30 when the car is off?

flood

Helms has a process to check it, but it doesn't involve what the speedometer shows when its disconnected.

It has you test the Voltage from the VSS to the ECM/PCM.

- Measure voltage between the ECM/PCM connector terminals C18 and A9 (has diagram)
- Does the voltage pulse 0v and 5v?

If yes substitute a known good ECM/PCM and recheck. If symptom/indication goes away replace the ECM/PCM

If no check for a short.

There is also a section for testing the VSS itself with an ohmmeter. I sent them to your email address in your profile.


Modified by flood at 8:47 AM 4/18/2005