PCM and Keys Issue

[imp]

PCM suspected, I ordered a new one, which came with 2 "pre-programmed" (PATS) keys. Had teeth cut by locksmith duplicating my oiriginal keys. Installed replacement PCM, inserted key, PATS indicator winked properly, started engine. Other key won't start engine. The explanation which came with the PCM for programming, I did not follow. Stupid me. PCM was not the issue after all.

OK, not wanting to have only one key, I put the original PCM back in, had the 2 original Ford keys we had always used, 2 of them, started engine normally. Other key WILL NOT start engine! WTH did I do wrong??
imp

 

[TechGuru]

Use ForScan and wipe and program PATS from scratch.

 

[imp]

Use ForScan and wipe and program PATS from scratch.

@TechGuru
Thank you. But I cannot understand how removing a PCM which works with 2 keys, then putting it back, battery was disconnected during the work, why only one key worked? imp

 

[TechGuru]

I believe the PCM and Security module are now no longer in sync.

 

[imp]

I believe the PCM and Security module are now no longer in sync.

@TechGuru
IOW, installing a different PCM fouled up the match between the Security Module and PCM? I figured something like that. imp

 

[drdoom]

Imp you are having quite a time with all those modules!

 

[imp]

Imp you are having quite a time with all those modules!

@drdoom
TRUE THAT!

 

[Harpua216]

are they both Strattec Ford keys?

 

[imp]

are they both Strattec Ford keys?

@Harpua216
They are embossed with the Ford logo, is all I can say about them. imp

 

[Harpua216]

@Harpua216
They are embossed with the Ford logo, is all I can say about them. imp

i would say they are close to OEM. some of the bad ones have batteries in them and parts that go bad. i had to buy two keys, only the one from the dealer programmed first. i could not program the knockoff first, but only 2nd. the first one i bought didnt even work at all. food for thought i guess

 

[imp]

i would say they are close to OEM. some of the bad ones have batteries in them and parts that go bad. i had to buy two keys, only the one from the dealer programmed first. i could not program the knockoff first, but only 2nd. the first one i bought didnt even work at all. food for thought i guess

@Harpua216
Thanks for info. imp