a cheaper Lexia 3 Citroen Peugeot diagnostic tool for only 59usd and there are missing some chip, compared to the original one.

Cheap Lexia 3

Original Lexia 3

Communicated with the vendor, they say the cheap Lexia 3 is designed with this kind of board as what i got.

On original interface “those caps” are resitors (473) 47k – R5 and R6. Optocouplers seems to be HCPL-063N-000E and HCPL-0500-000E. Also the filter from USB input is ACM2012D-900-2P (TDK) – most of clones have not this USB filter (2 resistors of 0 ohms are used).

On relay pcb the round red component is a varistor and original is V18ZA40P (in most clones is blue and have not the same specifications as the red one).

On relay pcb there is another optocoupler ZJYS51R5-2PT-01 (TDK) on the edge area near relays used for VAN BUS.

Some pictures from an original XS EVOLUTION PCB revision C.

He tells me, there mainly are two kinds of Chinese Lexia3 from different factories. One cheaper but lack some chips, the other with full chips of high quality.

The good Lexia 3 should come with PCBs as follows:

It’s item :

http://www.obdii365.com/wholesale/Lexia-3-Lexia3-Citroen-Peugeot-diagnostic-PP2000.html

And it’s very kind of the vendor that he tells me, even if the PCB is designed as above, there are some different similar clones, not all HQ.

This is the comparison he shows me:

The left: good ; the right: bad

Big thanks to fobdii.com, with lots of info to help me. Finally, i adapted his advice and decided to exchange the cheap Lexia 3 for a high-quality Lexia 3  with a bit more money. It works like a charm now.