VSS Silverado

silven wrote in news:Xns94E7565237B63silvencanadacom@206.167.113.5:

It is a 2000 silverado 4*4 automatic

if the truck was under water expect lots of electrical problems. it very well could just be the vss also.....how deep was the water?

"Scott M" wrote in news:HVqoc.21134$ snipped-for-privacy@twister.socal.rr.com:

It was up to the Dash... but this vehicle was running for at least 6 months before this problem started...

How can I tell if a VSS is good or not?

thanks for the reply

silven wrote in news:Xns94E7747DB326Bsilvencanadacom@206.167.113.5:

He also connected his multimeter to the VSS but was unable to determine anything from that.

What I want to know is how come he was able to control the speedometer with his gm computer... Does the gm computer pass through the main truck computer under the hood? If so does that not mean that I have good wiring going through?

Would someone know which wires I should follow from the main computer to the cluster for the speedometer... since it will be another week before my next appointment... maybe I can check things out a little on my own.

Thanks everyone

Does the speedo not work at all? Never? If so sounds like something different from the VSS because you said the computer knows the speed. If the comp knows the speed then its working. Just so you know, expect electrical problems from now on, could be years from now also. I've had experiance with a few cars that ended up in canals and they all had little anoying, hard to find, elect problems the rest of their life. If I owned that truck I would buy a wiring diagram for sure. Also...get under the hood and dash and check every main electrical plug you can find for water in it. If you have the ability, pull the gage cluster and check for dirt/corosion at the plugs and even inside it. Did your insurance save this truck? Maybe you can find a solution from them? Good Luck

"Scott M" wrote in news:Z7Noc.21988$ snipped-for-privacy@twister.socal.rr.com:

The speedo will work sometimes for short periods.

No it was not my truck when it went in the water...

It was truck I bought knowing it was in the water because the price seemed good and truck was in perfect working condition..

I know for sure the people who restored this vehicle changed the cluster.. and main computer...

I did have the cluster out and everything looks fine with the wires

The GM tech was also able to control the Speedometer with his test module computer...

I tried a different cluster and it was the same.

I now believe that it is in the wiring.

Would you know which wire(s) to follow from the main computer towards the cluster?

Because the GM tech was able to access the speedometer with his module does that not mean there is a good connection running to the cluster?

Sorry for all the questions I am just trying to learn a little more so I can test before my next GM appointment, they did not have enough time to finish the job on Monday at $70 per hour it is a little costly.

Thanks for your post

================== Sorry I cant be of more help without a wiring diag. It might have a "buffer" for the speedo between the ECM and head, I really dont know for sure. Check plugs for corosion by just unplugging and plugging them in. See if you can get a diagram for it and do it yourself. $70 an hour chasing electrical problems can get expensive. You could also put the back up on blocks and let it idle in gear. have someone watch the speedo for you. wiggle wires and see if it comes alive. Might get lucky and get you in the general area of the problem (if its a bad connection)....GL

I did read most of the posts. My question would be this. If you have a problem with the VSS. It really should set an error code in the ECM. Since it controls other engine functions The other question is do you notice any changes in the trucks performance?

Just something I did not see addressed in the post. But what do I know... Remove NoSpam to reply, Thanks

Hey everyone thanks for all your help. I found the problem

The problem was a bad connection to the Cruise Control module under the hood.

Thanks

=============== Cool! just out of curiosity....Was it corroded from water in the plug?

"Scott M" wrote in news:I84qc.45$ snipped-for-privacy@twister.socal.rr.com:

It was corroded from water.

I took the module apart and it is finished rusted resistors falling off. The guy who rebuilt this thing forgot to clean it out... Now I have to get one.

I guess I will have to really verify everything on the truck to see if the same mistake was made in other places.

Thanks for the post