After pulling fuses and relays to find a parasitic drain ( which I haven’t found) the car is now in failsafe and won’t start. 
Code P1586 which I can’t clear. Does anyone have a way to clear the code. Much appreciated , thanks Mike. 

Hi

Thats one Ive never seen before, I's check all the fuses are good, as one may of popped when been put back in, also check the relays are in correct and in the right slot, easily mixed up

have you tried disconnecting the battery since, may reset it

if that does not work, ideally you need some one with Jaguar ids/sdd, as that will read every module and hopefully show up the fault

cheers

Joe

Thanks Joe, I’ll go through the fuses. The relays are correct and I did disconnect the battery. 
 

Hi Joe,

I'm back after many attempts to fix my S Type. Took it to a dealer and they said it was  the fuel pump. I replaced it, and still no joy. Even changed the throttle sensor. Buggers  were not interested in me giving them the info you sent me. Back to square one. Could you help me figure out how to deal with the TACM to PCM failure. I'm handy but not that comfortable with electrics.

Thanks again.

Michael

On 7/22/2023 at 11:33 PM, Mike C said:

After pulling fuses and relays to find a parasitic drain ( which I haven’t found) the car is now in failsafe and won’t start. 
Code P1586 which I can’t clear. Does anyone have a way to clear the code. Much appreciated , thanks Mike. 

This may help; https://www.jaguarforum.com/threads/code-p1586.69622/