Tech 2 Purchase

[Tonyrodz]

I'm thinking of buying this Vident scanner for my 2006 Suburban:

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Am I going to be able to read live feed ac functions?

It says this--
So going by that statement I'd say yes.

 

[Doubeleive]

So before seeing this video I had thought you only had this type of error on the Envoy.

That sure looks like something is bad with the tool.

For comparisons sake tomorrow I will make and post a short video of my Tech 2 and TrailBlazer requesting SPS data. For the 2002 TrailBlazer/Envoy I can even show and explain each instruction the Tech 2 sends and the data it receives!!

the nbs and nnbs are different system and may behave differently, the chimes and messages on the nnbs happen sometimes it depends on what is being done

 

[George B]

the nbs and nnbs are different system and may behave differently, the chimes and messages on the nnbs happen sometimes it depends on what is being done

Exact same as what mine does! I even hear your stereo stop playing for a bit. Thanks Wes!

 

[TJ Baker]

@George B

I have to have a healthy serving of crow for lunch here!!

I was quite surprised to see my cluster do the same at requesting SPS data.!! I need to pay better attention it would seem.

After seeing my own truck do the same I had a look at the data stream and saw the reason for it.

When requesting SPS data, (which is done by reading specific data blocks in the control modules) the Tech 2 first issues a "test tool present" message to all modules on the network. This is followed by a directive for all modules to cease normal data traffic. This cessation of normal traffic remains in force as long as the Tech 2 repeats the "test tool present" message every few seconds. And of course without this traffic the cluster can't display all that data that is normally sent to it through those normal messages on the class 2 data bus.

Here is a screenshot that shows the normal traffic seen above the purple line. Below the purple line only test tool requests and the respective module responses are seen...




After the Tech 2 has gathered all the calibrations and such from the various modules it stops sending those "test tool present" messages and the "All Quiet" directive expires and each of the various modules resume operations. As a part of this it seems the cluster resets itself. Seen below is the network resuming normal operations beneath the purple line...




I was able to duplicate the cluster behavior by sending the "All Quiet" command myself using my Android phone, a bluetooth OBD2 adapter and a serial terminal app, and allowing the command to expire, causing the cluster to reset.

And so it looks like your Tech 2 is now working as designed.

 

[Fless]

Very interesting, and impressive!

 

[George B]

@TJ Baker Very impressive and much appreciated. This is really good stuff! Did you also get the same UNKNOWN DRIVER message?

Are you interested in playing around with my faulty VCI module if shipping isn't too pricey?

 

[exp500]

George B- I'm willing to throw in some paypal to crowdfund your shipping. This is fun/educating to watch. PM Me.

 

[TJ Baker]

@TJ Baker Very impressive and much appreciated. This is really good stuff! Did you also get the same UNKNOWN DRIVER message?

Are you interested in playing around with my faulty VCI module if shipping isn't too pricey?

I did get the unknown driver etc message. I have the whole thing on video if you're interested.

The results seen at the cluster are very much the same, if not precisely the same when I initiate the event with phone and serial terminal and NOT the Tech 2.


Well lets see what shipping we're talking about for the VCI. I am in 81154 zip.

The screenshots are of a Google spreadsheet I made while learning how to read the GM Class 2 serial data. It has become a hobby of mine that was the result of working with my TrailBlazer but is also of use with my 05 Yukon.

 

[George B]

I did get the unknown driver etc message. I have the whole thing on video if you're interested.

The results seen at the cluster are very much the same, if not precisely the same when I initiate the event with phone and serial terminal and NOT the Tech 2.


Well lets see what shipping we're talking about for the VCI. I am in 81154 zip.

The screenshots are of a Google spreadsheet I made while learning how to read the GM Class 2 serial data. It has become a hobby of mine that was the result of working with my TrailBlazer but is also of use with my 05 Yukon.

looks like a fat rate padded envelope will cost 8-10 bucks to send snail mail.

 

[TJ Baker]

looks like a fat rate padded envelope will cost 8-10 bucks to send snail mail.

Sounds good to me, will PM