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.
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:
TRY AT YOUR OWN RISK.