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Rework Ktag Kess V2 pcb hardware-work no issue

Share free solutions of reworking clone Ktag and Kess V2 ECU tuning tools to work completely like the genuine.

Original PCB in the photo ... use if you have any other issues.

Replace by quality components.
Thx button would be nice.

Free for everybody!!! No more payment for this!


Part 1 - KTAG hardware rework

Ktag before rework:



KTAG hardware rework solution:



k6b = BC817-25 SOT-23 (in some originals)

All capacitors should be replaced with the exact same one but new

Part 2 - Kess v2 hardware rework

Kess v2 pcb before rework:



KESS V2 rework solution:


Transistors to use :

Murata filters:
NFE61PT472C1H9L (connect ground for all of them)

1uF - 35V
220uF - 10V
10uF - 16V tantalum

Fill up all holes from side to side
Use photo as reference if others components are different

From sally:

KESS V2 is a ECU programming tool that is perfect for OBD use, while KTag is perfect for Jtag, BDM and all the Boot application (tricore and ST10).

With KESS V2 you programming directly through the OBD port of the vehicle, while with Ktag (Ktag 2.13) you need to take apart the ECU and open it, after you can make the read/write operation.

Many ECU has the advantage that can be read and write from OBD port (so KESS V2 is perfect), but there are lot ECU that need to disassemble from the car and open and this is the case for all the ECU that need to be programmed with Jtag, BDM and Boot protocols, so KTAG is needed.



How to solve Kess V2 fw v4.036 Ksuite connection not established

It’s a customer solution of how to fix KESS V2 firmware v4.036 master communication/connection issues; that is the computer cannot recognize ktag.

Error message in Kess v2 firmware v4.036 Ksuite v2.22:

connection not established


Customer solution:

I took this UL46 USB protection chip off my old Ktag board.

this is the UL46 USB protection chip

(if you don’t have this chip, go to the kess v2 vendor for it)

Then Kess v2 v4.036 is detected on usb :) Everything is ok so far.




How to reflash CARPROG Full V8.21MCU AT91SAM7S256

Here is a experience from DK forum members who made this possible about how to reflash CARPROG Mcu AT91SAM7S256
Tool use: Carprog clone v8.21 firmware 
We need the stuff:
1- AT91SAM7S256.bin
2- Jtag programmer
3- Jtag software

We need to prepare the Carprog to connect to Jtag programmer but first the flash need to be erased, the Jtag function in mcu is disabled, you can't connect to the mcu before erase the flash. Remove the AT88SC eeprom from the board, please note where is the pin 1 in eeprom before remove:

Carefully lift the pin 55 (reset) of the mcu and solder a wire and secure it with a small ammount of silicone (you don't want to broke the pin in the process).
Connect the Carprog (with the pin 55 dissconected) to the 12v supply, wait about 10 seconds and connect the wire from pin 55 to Vcc (3.3V) in Carprog:




Wait from 5 to 10 seconds after connect the 12v supply, the flash content will be erased and the Jtag option of the Mcu will be enabled now. If not work leave connected for about 3 to 5 minutes. Disconnect the 12v supply from CarProg full  and remove the pin 55 wire from vcc. The pin 55 must remain disconnected until the programming process is done.


Ok, that’s it. I make it; and you try on you risk.