Sunday,21-April-2019

VCDS 18 - china clone some fix

EN

You can find plenty information in internet how actually to convert some old VAG cable with Atmel inner IC components into modern version. My problem was, that after ordering one clone from china it start only one time and that was it…

After digging and finding the needed FTD firmware, I try to fix that not running state but it was not possible.

What I mean is, that the FTD programming software see the 93C46 memory as.. blank. I can connect the cable, see it as FTD serial device but that`s all. After I select the right firmware, push - write, it been claimed that software wrote all bytes and after pulling the cable and plug it again.. it is exactly the same..

So, I open the cable and decide to remove the chip.

vcds1.jpg

Problem was that with IC soldered on spot and right clamp on top no reading was possible. So removed:

vcds2.jpg

With eeprom programmer all was red and found the problem. The first few bits was set to 0xFF:

vcds3.jpg

And should be like that:

vcds4.jpg

Corrected, saved and soldered on spot. Now work almost well. Almost, because sometimes if you connect the cable in the OBD port and then in the USB port it shows : unrecognized device. After plug it out and in again it show it correct.

That for sure is related to some capacitor or that LM7805 voltage regulator. Perhaps better to be replaced with that new type micro DC to DC step down regulators..

Hope that give you some tip.

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