Pats question- how it works? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 12-02-2007
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Pats question- how it works?

On my 2001 edge I bought it with no keys. I have an ignition cylinder, key and matching theft module for it that I haven't installed yet. When I change these parts will it start or will I have to have it programed by the dealer or change the other computers with matching components. I have access to a parts truck. Of my 4 complete trucks this is the only one that doesn't run. I want to get it running to check the engine and trans to make sure they are good
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Old 12-02-2007
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The PATS system works by sending out a RF signal that is picked up by the transponder in the key. The transponder then returns a unique RF signal to the vehicle's computer, giving it the ok for the vehicle to start and continue to run. This frequency of your transponder key is recorded in the PATS module during a "training" mode. If the transponder keys you have are not recorded in the PATS module you will have to have the old keys erased and the new keys programmed. If the PATS module recognizes a "foreign" frequency from the transponder key, or no signal at all, it will interrupt the fuel injector circuit and indicate a "failure to recognize" via the THEFT light on the dash.

Most Locksmiths will "teach" your PATS system your keys for a price cheaper than the dealer. Also, Locksmiths can come to you, meaning you don't have to worry about towing the truck to the dealer. My PATS programming cost me $40 for the first key, and $10 for each additional key. The Service Call fee was $45, so for less than $100 I got my truck running. It would have cost me that much to have it towed to the dealer, who wanted almost $250 to program 2 keys.
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Old 12-02-2007
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I would recommend checking the engine and transmission BEFORE you get it running. It's much smarter to find the problem before you put the truck on the road.
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Old 12-02-2007
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I guess the question is if I change the pats module(and use the matching keys) does the engine computer or body computer need reprogrammed.
Thanks John
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Old 12-02-2007
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Quote:
Originally Posted by wvcat
I guess the question is if I change the pats module(and use the matching keys) does the engine computer or body computer need reprogrammed.
Thanks John
2001+ does not have a standalone PATS Module like the 99~00 Rangers do. The PATS Module functions are incorporated in the PCM.

For 2001, I believe that you would have two choices:
  • swap in the lock cylinder, keys and PCM from the same donor (identical year/engine/transmission/drive); or
  • swap in the keys and lock cylinder from a 2001~2004 Ranger donor and then have a dealer/locksmith train your truck's PCM to recognize the other truck's keys.
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Old 12-02-2007
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It does have a theft module but I may still have to have it programed...not sure. Guess I'll just have to install it and see what happens.
John
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Old 12-02-2007
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Quote:
Originally Posted by wvcat
It does have a theft module but I may still have to have it programed...not sure. Guess I'll just have to install it and see what happens.
John
You WILL need to have the PCM programmed to recognize different keys.

Again, there is no standalone PATS Module in 2001. The theft module you're talking about is probably the Central Security Module (the white one near the PS airbag). It does power locks, remote keyless entry, etc. but has nothing to do with PATS. On the plus side, the CSM can be programmed at home to accept any compatible RKE fobs. And there's no need to swap out the CSM in the truck - nothing will change.
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Old 12-02-2007
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Yes thats the one I was talking about, the white one. Thanks
John
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Old 12-03-2007
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No matter what you do, since you have no original keys, it will have to be re-programmed to the new keys. Since you have all of the parts, it will be cheaper for a locksmith to do (just a service call and labor). Just make sure you use a reputable locksmith and not just anyone saying they are.
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