[ROD-BENDERS]

all those not using a charger see you in the immo off department sometime soon

[Dash_Burner]

Always charger when read or write ecus by obd. And always good stabilized power when reading on bench. Its a LAW.If power fall under 12V an easy looking job becomes a pain in the ass

[mikroel]

Guys,guys,guys,@amaa @ROD-Benders @Dash_Burner
you totally MISS the point .

The questions was reworked KESS and what power supply MUST be used for ENABLING R/W by KESS.

IF you MUST use voltage 13.8 V or 14 V for reading or writing ECU then definitely something is WRONG with your KESS.

Normally Genuine or good reworked KESS can R/W ECU with voltage 12 V (or even under 12V) without any problem by car OBD connector or on the bench.

Using a battery charger or power supply is a matter of SAFETY , BUT not a NECESSARY device which must be used with KESS to ENABLE reading and writing!
ESPECIALLY NOT to ENABLE 13.5V OR 14V as power supply

I am so SORRY if you have such a BAD KESS and wish you GOOD LUCK !
Soon you will digging on scarp yard looking for another ECU even if you used EXCELLENT Battery charger

[530d]

Guys,guys,guys,@amaa @ROD-Benders @Dash_Burner
you totally MISS the point .

The questions was reworked KESS and what power supply MUST be used for ENABLING R/W by KESS.

IF you MUST use voltage 13.8 V or 14 V for reading or writing ECU then definitely something is WRONG with your KESS.

Normally Genuine or good reworked KESS can R/W ECU with voltage 12 V (or even under 12V) without any problem by car OBD connector or on the bench.

Using a battery charger or power supply is a matter of SAFETY , BUT not a NECESSARY device which must be used with KESS to ENABLE reading and writing!
ESPECIALLY NOT to ENABLE 13.5V OR 14V as power supply

I am so SORRY if you have such a BAD KESS and wish you GOOD LUCK !
Soon you will digging on scarp yard looking for another ECU even if you used EXCELLENT Battery charger

I reprogrammed a lot of cars "damaged" kess with success. Do not write nonsense. If you do not want to help for free then do not clutter this thread.
you here asking help for free, your help is not free.

[domelec]

I have a problem with my kess, before rework worked ok.
I used the FANTOMEL description, now I have a problem, my kess reads the correct voltage but gets the message "wakeup error" and does not identify and I can not read anything. If I plug the charger into the car and the voltage is about 13,8-14V kess works fine. Where is the problem? Please give me any help or hint...

if it worked ok before rework then rework was not correctly done
relook at the soldering of the parts you replaced
if all solder looks good (or better to just resolder all) and still not working like it did then test each component that you replaced because one must be faulty.

most likely a transistor bad