This is a known problem on some firmwareversions of the 1.8 TDCI which is not related to the ELM327 interface or ELMconfig. A few years ago Ford even released a TSB (technical service bulletin) to all dealers about this problem.
Please help me because I'm desperate.
Today I tried to update my pcm, my bad, using elm and now the engine can't start.
my car is focus 1.8 tdci, pcm ver. 7M51-12A650-BNA and I made a copy of original firmware
What to do? please help
On the affected firmware versions the PATS data is deleted from the PCM during a firmware update. If the PATS data file of the PCM is empty the car will not start. In this case it is nescessary to pair/initialize the PCM with the instrument cluster after a firmware update. This can only be done with a suitable Ford specific diagnostic system which has the ability to program the Coded PATS (immobilizer) system.
At the moment the only thing you can do is find someone (with a Ford specific diagnostic system) who is able to pair/initialize the PATS system of the PCM and instrument cluster.