Issues with reading PCM

[twenglish1]

Little background first, new to EFI tuning, but good with computers, electronics and all things mechanical. The current project, and my first LS swap, installing a 5.3l into an 84 Camaro. Still working on the mechanical aspects of the project but have been also messing around with the PCM and just trying to learn as much as i can about the tuning aspect in the mean time.

I am using a VCX Nano, PCM Hammer and a mix between universal patcher and tuner pro. Planning to use megalog viewer for histograms and reviewing datalogs. So its kinda strange to me, i have tried 3 different laptops to read and write to the PCM, all running windows 10, only one of them successfully reads probable 95% of the time, and of course this is the olders and slowest one that is painful to use for how slow it is, so was hoping to get this working correctly on one of the other ones. I will say i took the risk and have wrote files from all 3 laptops and have never had an issue writing, always have been able to write a file with 0 retries. I even reflashed the PCM to the 12212156 OS with no issues. I also have to disable 4x communication in PCM Hammer or it fails to read very early on. Here is a log of a failed read with 4x disabled.

[antus]

I cant be certain from the logs, but it looks like the interface crashes at some point through the transfer. No data comes back after that point. It could be that the interface is crashing more with the faster computers because its under more load, and is holding on with the older one a bit better. Out of curiosity, if you hit "get properties" after it has failed do you get anything back? If you hit re-initialise interface does the interface come back to life? I am thinking its an interface hardware problem and there might not be much you can do about it other than replace the interface. If you can borrow another interface to test with everything else being equal you might be able to prove it.

It just looses comms here, TX means transmit, but no more RX receives are heard from the car.

Code: Select all

[05:47:51:042]  Sending 'test device present' notification.
[05:47:51:057]  TX: 8C FE F0 3F
[05:47:51:073]  Reading from 126976 / 0x1F000, length 2048 / 0x800
[05:47:51:073]  TX: 6D 10 F0 35 01 08 00 01 F0 00
[05:47:53:104]  ReadMsgs OBDError: STATUS_NOERROR
[05:47:53:120]  No payload following read request.

[Cincinnatus]

Picture of your nano please. Just curious as i have a vcx nano that works fine every time I use it. Also do you have vx manager installed and j2534 pass thru installed?

[twenglish1]

What's even more strange is it almost always seems to fail at the same point, I've also tried messing with the advanced settings under the device manager and lowered the buffer speeds I believe it was called. I think I have tried the get properties and reinitialize device after failures with seemingly random success rates. VX manager with j2535 pass-through is installed, firmware and license was updated, it wouldn't work at all until I did that. Only other difference I have noticed with the different computers is I belive the only one that works consistently has regular 2.0 ports, I think the two other ones both have the USB SS or 3.0 ports, will include a picture of the device later on, but it's the blue GDS2 version purchased from "AutelShop" on Amazon

[antus]

Yep pretty sure that's a low quality bad clone. They have lots of 1 star feedback talking about viruses in the bundled software and the installation PDF shows you have to install a very old driver then an old cracked driver dated 2020. In the screenshots it even shows a problem with it and they select an interface called "MDI2" and are using that for the rest of the screenshots, not the device they claim. Send it back and get a legit OBDXPro for less money that will do what you want properly and support 4x speed.

[twenglish1]

I didnt realize there were knockoffs of the vcx nano, which obdxpro device would you recommend? I would prefer USB over Bluetooth, this will work right? https://obdxpro.com/product/obdx-pro-gt ... nd-tuning/

[antus]

Would recommend the GT. The author is a member here. I believe they are on amazon to with us shipping.

[twenglish1]

I cant seem to find it on Amazon but found it on the obdxpro website, how long is the lead time usually? Currently says back ordered

[Tazzi]

I cant seem to find it on Amazon but found it on the obdxpro website, how long is the lead time usually? Currently says back ordered

We are waiting on more stock to arrive shortly

[twenglish1]

I purchased the obdxpro gt, looking forward to it, any special software or setup required?