2005 Ford Mustang 4.0L ecu swap

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Ecorbiere
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Vehicle: 2007 Ford F350 6.0L powerstroke diesel

2005 Ford Mustang 4.0L ecu swap

Post by Ecorbiere » Sun Jun 28, 2020 6:43 pm

I have a 2005 mustang 4.0L we swapped the engine and trans from a donor car because the heads were screwed on the engine and trans was on its last legs. We got the engine and trans in, and the car seems to run rough. Swapped the ECU out from the donor car and the car won’t start or turn over, theft light flashes fast, we held the key from the donor car against the ignition and still no change. Can I flash the ECU to as built data and program the keys back into the pats and will it be fine after?

Juice
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Re: 2005 Ford Mustang 4.0L ecu swap

Post by Juice » Mon Jun 29, 2020 11:36 am

I don't know if you can change VIN on that PCM. It would be in the VID block if you can.

With the new pcm, do a "reset learned parameters" first, than program keys, PATS programming. That should get you running.

FORScan
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Re: 2005 Ford Mustang 4.0L ecu swap

Post by FORScan » Wed Jul 01, 2020 7:07 am

This car (Mustang 2005) has no distributed PATS, so PCM is the only PATS module. If you replace PCM, you have to reporgram PATS (erase all known keys and program 2 new ones), unless you have purchased ignition keys together with PCM that are programmed to it. FORScan can do it for you.

As for VIN programming, it is programmed in VID block of PCM, FORScan and majority of adapters doen't support VID programming on this generation of cars. We plan to add this feature in the future, but it will require an adapter with FEPS supprot (Flash EEProm Programming signal, 18V on pin 13).

Ecorbiere
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Vehicle: 2007 Ford F350 6.0L powerstroke diesel

Re: 2005 Ford Mustang 4.0L ecu swap

Post by Ecorbiere » Wed Jul 01, 2020 6:06 pm

With just reprogramming 2 keys, will the car run and drive? Or will communication be lost between modules? And with the pcm out of the parts car, will the keys from that car still be programmed into the pats or do I have to re sync modules together?

cook077@fastmail.fm
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Re: 2005 Ford Mustang 4.0L ecu swap

Post by cook077@fastmail.fm » Thu Jul 02, 2020 2:48 am

Could you not just swap ignition cylinders from the parts car then your keys will match the PCM .

Juice
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Vehicle: 2007 Mustang, Coyote, MagnumXL 6spd, 404RWHP/393TQ

Re: 2005 Ford Mustang 4.0L ecu swap

Post by Juice » Thu Jul 02, 2020 11:01 am

cook077@fastmail.fm wrote:
Thu Jul 02, 2020 2:48 am
Could you not just swap ignition cylinders from the parts car then your keys will match the PCM .
Yes, unless you attempted to program the keys and erased the stored keys.

Juice
Posts: 185
Joined: Sat Jan 21, 2017 4:54 pm
Vehicle: 2007 Mustang, Coyote, MagnumXL 6spd, 404RWHP/393TQ

Re: 2005 Ford Mustang 4.0L ecu swap

Post by Juice » Thu Jul 02, 2020 11:04 am

Ecorbiere wrote:
Wed Jul 01, 2020 6:06 pm
With just reprogramming 2 keys, will the car run and drive? Or will communication be lost between modules? And with the pcm out of the parts car, will the keys from that car still be programmed into the pats or do I have to re sync modules together?
The PCM will communicate just fine with the other modules. You might end up with a VIN mismatch. I say might, as I have not seen a VIN in any other module. In my case, i didn't have my VIN in the coyote pcm, and no VIN codes popped up. Speedo worked fine, rolling door locks kept working, so the Cluster and SJB were getting signals from the PCM just fine. But I digress.

What concerns me is your original issue was rough running after the engine swap. I would have done some diags as to why it was running rough rather than swap PCMs. Was the "new" engine known to be good?

I would: put the original PCM back in the car. Reprogram (if needed) the original keys to get back to a running car. And diagnose the running problem.

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