Problem:
Recently did all keys lost on a Porsche Cayenne with the Siemens kessy. Xhorse VVDI Key Tool Plus failed to read KESSY data using XDNP61 KESSY solder free adapter. I did try to read in circuit according to diagram, no dice. Ended up removing the 93C86 to read out of circuit and got it done. Anyway, has anyone had luck with this adapter to read board without desoldering chip? Or is it not worth messing with since removing eeprom is so quick?
Here is the clue.
1).
Your kessy module is an early one, otherwise reading the eeprom would not have worked!
No adapter will help. These are for in circuit reads on Continental kessy.
Yours is a very late Siemens KESSY and so the only really reliable way is to remove the eeprom chip and read out of circuit.
2).
If VVDI Prog fails to read in circuit, to read write in circuit just need to lower voltage to 3.3 to 3.5. When voltage is at 4.5, the crystal oscillator interrupts the chip.
Read KESSY data with vvdi prog in circuit and make key with VVDI2.
3).
You can read the KESSY module with a clip. One of our customers read it using a Key Tool Plus with a clip, and that was successful.
Then created a dealer key and added a key via OBD2.