VXDIAG as Tech2 successor

[Teeroy78]

Hi there @Michael1972
Have you received your Tahoe yet? If so welcome to the club!

I was hoping you had an update on this as it appears I need to reset my fuel trims after all. It looks like it's either this interface here, or a Tech2 from Alibaba at much higher price. Or, you know, go to the dealership and pay them to do it.

I hope all is well Michael, and we are eagerly awaiting your review.

Hi there,

as mentioned before, here is my first impression of VXDIAG.

<snip>

As soon as I have my Tahoe I'll give it a run, do a write up and post some more pics.
BTW, everything ran smoothly, even for a computer illiterte as myself, plug and play. Recognised the USB device instantly. Could not test the WiFi feature, since I miss a powered OBD port ;-)

Cheers,
Michael

 

[TahoeLTZ2012]

I just purchased the VXDIAG for GM and played around with it on my 2012 Tahoe.
I tried it using the GDS2, but it does not list GM full size trucks. I chose the Colarado and was able to pull fault codes.
Then i tried the Tech2win, but it would not connect, and asked to connect a Candi module. I was under the impression you did not need the Candi for this, so not sure if im doing something wrong?

 

[Scottydoggs]

Hi there @Michael1972
Have you received your Tahoe yet? If so welcome to the club!

I was hoping you had an update on this as it appears I need to reset my fuel trims after all. It looks like it's either this interface here, or a Tech2 from Alibaba at much higher price. Or, you know, go to the dealership and pay them to do it.

I hope all is well Michael, and we are eagerly awaiting your review.

take the neg cable off your battery for 30 minutes, you just reset the fuel trims for free. if you got a cheap code scanner, clear codes, also resets the trims.

 

[Teeroy78]

Hey Scott, thanks for the tip! I can say for certain that clearing the codes does not reset the trims (I've cleared them way too many times since this issue cropped up so I could remote start in the cold until it triggered again), but I have not tried pulling the negative cable for 30 minutes. Too bad I just filled up on the weekend; I won't have a refueling event for quite some time now. I'll still try it tonight and see how it reads on my scanner tomorrow. If nothing changes, then I'll do it again right before I fill 'er up next time.

take the neg cable off your battery for 30 minutes, you just reset the fuel trims for free. if you got a cheap code scanner, clear codes, also resets the trims.

 

[Teeroy78]

Hi Paul,

Thanks for your update! I'm sorry that you're having some trouble. I may hold off on the VXDIAG then for a bit, especially if the battery disconnect fully resets my trims and computed alcohol content. That's the only thing I need right now that I can't do with my BlueDriver.

I just purchased the VXDIAG for GM and played around with it on my 2012 Tahoe.
I tried it using the GDS2, but it does not list GM full size trucks. I chose the Colarado and was able to pull fault codes.
Then i tried the Tech2win, but it would not connect, and asked to connect a Candi module. I was under the impression you did not need the Candi for this, so not sure if im doing something wrong?

 

[Scottydoggs]

taking power from the pcm will re set the whole pcm. once re powered up it needs to re learn.

 

[Teeroy78]

Bad news. Pulling the negative battery cable did reset the short and long term fuel trims, but it did not reset the learned alcohol content (currently stuck at 63.1%). I had the negative cable pulled and shorted to the positive cable for about 20 minutes then went for a road test. Since it didn't reset the learned alcohol content (nor my radio presets, garage door opener programming, or memory seats), I pulled the cable again and shorted it to the positive lead to fully drain any charge and left it overnight. Same thing in the morning (fuel trims reset but not the alcohol content, radio presets preserved along with garage door and memory seats).

Sorry for hijacking the thread, but to bring it back full circle, I guess if there are no positive VXDIAG reviews at this time, then I'm going to have to get a Tech2 to properly reset the learned fuel composition.

take the neg cable off your battery for 30 minutes, you just reset the fuel trims for free. if you got a cheap code scanner, clear codes, also resets the trims.

 

[rockola1971]

taking power from the pcm FOR A LONG ENOUGH PERIOD will re set the whole pcm. once re powered up it needs to re learn.

There its all fixed but you are absolutely correct!

 

[iamdub]

I don't know if it applies to the newer stuff, but I just pulled the PCM fuses on my '02 S10 while it was running. The truck would immediately die, I'd reinstall the fuses, then start it up. Sometimes it would stall once or a few times and I'd just restart it until it would run on it's own. Then I'd go run the snot out of it.

Curious, though- why do you wanna reset your trims? Is there a problem or did you replace something or... ?

 

[Scottydoggs]

he must be flex fuel, that content sensor might need its own reset. via a scanner.