here is some info from the ford manual===
The control functions are contained in the instrument cluster. This module carries out all of the PATS functions such as receiving the identification code from the encoded ignition key and controlling engine enable. The instrument cluster initiates the key interrogation sequence when the vehicle ignition switch is turned to RUN or START.
The PATS uses the PCM to enable or disable the engine. The instrument cluster communicates with the PCM over the SCP network in order to enable engine operation. The instrument cluster and the PCM use sophisticated messages in order to prevent a theft. The instrument cluster and the PCM share security data (when first installed together) that makes them a matched pair. After this security data sharing, these modules will not function in other vehicles. The shared PCM ID is remembered even if the battery is disconnected. The instrument cluster also stores the vehicle's key identification code even if the battery is disconnected. There are special diagnostic procedures outlined in this workshop manual that may be carried out if either a new instrument cluster or PCM needs to be installed.
All elements of PATS must be functional before the engine is allowed to start. If any of the components are not working correctly, the vehicle will not start.
as you can see the "PATS" is buit in fairly deep, i do not know anyone who has effectivly bypassed "PATS" except for remote starts, however, this still requires a spare key and a little bit of hardware
let me know if this helped and f you need any more info
please send feedbake so we can better serve you
is the key one that was working in the truck you got the engine from?
have you installed the keypad switch?
do you have access to a scanner?
is the instrument cluster working and is it from the same truck as you have the keys from?
ok , i am not sure if we can make this work but we can give it a try
at the 'PATS' transceiver module, check the rd/lg wire for power in start and run,
check the bk/lb wire for ground,
i recommend that when you do this you load the circuit with a light- a volt meter may lead you astray by showing battery voltage on a circuit which will not carry enough current to do the job!
at the 'RAP' module, check for power to the bk/pk wire and the og/lg wire
check for ground at the bk/lb wire
check the rd/lg wire for battery voltage when the brake pedal is applied
let me know if this helped and if you need more info
please send feedback so we can serve you better
i am going to send you some reading so you can understand a little more about how the system works,
above is a pic of the pats transciever location, below is part of the instructions to remove it, hope these make it a little easier to figure out which is which
below shows where the rap module would be in the original truck
did you get a chance to read the post about with the description of the system? did this make the system operation any clearer to you?
let me know if this helped and if you need more infoplease send feedback so we can serve you better,positive feedback is always appreciatedLouis
do you have access to a scanner, to pull codes?
the key could be bad, i have also seen them work for years then give up
the transceiver sends out a signal when it is working, so being warm may be normal