CarProg with A9 A1 A1+ adapters test operation

Which adapter is necessary to make a test when the Carprog full fails to work? And how to do the test? Go on reading the post to get answers yourself.

A9 first!!!

If CarProg hardware test fail – in most cases you just need exchange 4x 74HC125 integrated circuit. Exchange all 4 74HC125 together!!!

update your Carprog A1 adapter:

open A1 solder additional tantalum or electrolytic capasitors – this MOD will solve “communication lost” problems.
– A1 before modification:

– A1 after modification:

or with electrolytic capasitors 47uF 25V

update your A1+ adapter: 
open A1+ solder additional tantalum or electrolytic capacitors – more stable OBDII communication.  Also very important for older CarProg users – change one 1k Ohm resistor and solder 120R Ohm

– A1+Before modification:

– A1+ after modification:

or with electrolytic capacitors

TRY AT YOUR OWN RISK.