Here's the deal. I have a '99 Ranger and the auto transmission finally crapped out on me at 225,000 miles. I found a '98 5 speed with decently low mileage on the transmission (engine's no good) and I am looking to use this as the donor vehicle to do the swap. The donor vehicle I know doesn't have PATS.

1) How will this affect the PATS in my truck when I swap out the PCM's?

2) What are my options? i.e., can i use this 555P-W bypass module or can I just completely remove the PATS system considering the PCM from the donor vehicle doesn't have PATS?

 

Note: I also have power windows, locks, mirrors, etc. Will swapping the PCM also affect these controls?

 

You did not mention engine sizes.

Transmissions are not interchangeable between engine sizes.

1999 PATS will have a module above glove box, that will need to be pulled out
PATS module is what read the PATS key and then gave the "OK to start" to the computer, the module and computer were "married".

If new computer doesn't have PATS then no worries, PATS was only for engine computer and only for it to start fuel pump and fuel injectors, it wasn't an alarm system.
So PATS didn't interact with anything else, your keys will still work along with everything else

I don't think 1999 Rangers had starter interrupt as part of PATS, but worst case is that you would need to Ground 1 wire of the starter relay that is in the engine fuse box, see diagram

 

It's a V6 3.0 for both vehicles. So, it's completely okay to do the swap with the PCM (from donor vehicle with no PATS), leave the PATS module installed currently installed in my Ranger and everything will be okay? The truck won't run into any issues starting? However, since you've said the module and computer are married wouldn't this pose a problem? I've read as much I could about PATS but can't seem to come to a conclusion on this understanding.

I see what you're saying in that if the PCM from the donor vehicle does not have PATS then everything should be okay. You are more knowledgeable on this then I will ever be. So please bare with me as I want to have a better understanding on this subject of matter. I really don't want to deal with the headaches of PATS if after I have done the swap. From this thread on explorer forums.

From my understanding, is that the PATS module with the encoded key sends a signal to the PCM with PATS. And from this signal the PCM gets the okay to start the vehicle correct? So now when I swap the PCM with no PATs integrated in it, the vehicle will still start regardless that the PATS module is still installed on the truck? Ultimately, you say the PATS is not an alarm system, so module does affect the ignition, only the PCM. i.e., from this standpoint after the swap is completely done, transmission, PCM, wiring harness and everything, the PATS module still installed will not affect starting the truck?

Thanks again RonD, you've always been a help with regards to my posts.

 

You will remove the PATS module, it is above the glove box.
Its wiring was only for the key reader and computer
You don't want to leave it in place

And keep the 1999 computer and its PATS module together, they are a "matched set", so they would be of value to someone with a bad computer that wanted to swap it out.
They need to swap out BOTH computer and PATS module, OR they would have to pay Ford Dealer to "remarry" module and computer.

So think of the PATS module and computer as ONE unit, if you remove 1 then you need to remove the other, these were called a Type B PATS system

Around 2001 model year they were ONE unit, PATS module function was incorporated into the computer, these were called Type E PATS

Info here: http://www.fordservicecontent.com/fo...b_aid_2009.pdf

And it looks like you will need to Ground Starter Relay in fuse box, but that is still a may be since Type B could be either way, even though it say it has starter interupt

 

Ah okay. I get it now. Since the PCM from the manual truck does not have PATS, the module isn't required.

I understand that after I remove the PATS module, I'm essentially removing the ground connection to the starter relay. Therefore, I have to ground the relay after I've removed the PATS module in order to complete the circuit. But, what if I were to just leave PATS module in place, would that affect starting the vehicle at all or is it completely necessary to remove it?

 

Also, would you mind to elaborate on what is "starter interrupt"? Thanks mate.

 

The PATS module grounds out the starter relay when everything is good for starting.

On a non-pats car this wire is already grounded.

Simple put: Put new non-Pats PCM into truck. Remove PATS module. and jump 2 pins (i get the pins in few for ya).

I had to do this when I put a PATS harness in my NON Pats truck.

 

Pin 1 (either Blue/Orange or Pink/Orange needs to be jumped to ground (or pin 7) which should be Black/White in color.

 

Awesome, thanks! These pins that you speak of, are they the ones connected to the PATS system module connected to the starter relay?

 

would all of this information still apply to a 97 4.0?

 

No, PATS was an option in 1998 and then standard in 1999 and up

1997 and earlier Rangers didn't have PATS in any form

 

so I'd just need a manual ecu and I'd be set basically?

 

Yes, if you are doing an auto to manual swap

 

alright thanks for the clarification, haven't made up my mind on the manual swap yet trying to see how hard of a job it'll be and it honestly sounds pretty simple especially since my truck doesn't have the PATS

 

Best thing I ever did to my 2003 Ranger was manual swap it.

 

so im in the same boat, i bought a ranger with a bad ecu did you ever figure out the 2 pins that you needed to jump for the pats module to ground out the starter?

 

You should start your own thread
And include the year of the Ranger

Starter motor and fuel pump issue for PATS is easy to by-pass, but no point in doing it
PATS main theft deterrent is no fuel injectors, no way to by-pass that

In 1999/2000 the PATS module is above glove box, it will have a pink/orange wire or a dark blue/orange wire that Grounds the starter relay in engine fuse box, so it can be activated by the Key

 

so do i just leave the pats module where it is and just swap the ecu to a 98 non pats manual ecu? With no added wiring?

 

If you have a 1999/2000 then yes you could do that but also have to change cam synchro and sensor to older 3 wire model, and add a 3rd wire, and repin computer connector

Also ground the PATS module's wire to starter relay

Its actually more of a pain than just getting a 1999/2000 ecu with its PATS module and key
ECM needs to match engine size and transmission type as well

Or just another ECU with same numbers as yours and get Forscan Software, I have been told it can re-marry ECUs and PATS modules but never tried myself, it can for sure add new keys