How To - ECU Replacement
- Thread starter jcolton
- Start date
lolo
Greenie N00B Member
Ok, I can answer myself my own question now.
For the forum records, we can do almost anything with FORscan including VIN clone, etc.
My case was that my ECU has gone Joe Biden and that resulted in a loss of power from 350whp to about 200 whp after the car was in service for something else. I could only guess the stupid mechanic removed the ECU without disconnecting the battery and that effed up the injector drivers. Found some elco shorted too, anyway. I purchased the new ECU and all was simple. (I will repair the old one to have it as a spare part)
Procedure to replace the ECU
1. uninstal lthe COBB APP. Then run FORScan - with the original ECU SAVE the PCM data: such asVIN, tyres and Body type (MAZDA EU or Norht MAerica, etc). You may also goto https://www.motorcraftservice.com/AsBuilt and download the complete AsBuilt settings for your vehicle (VIN required) in an AB file. This is also useful if you replace the Body Control Unit with a virgin one, you have it all in one file.
2. With the new ECU, in FORscan just upload the data saved on step one into PCM IC and write it. Cycle the keys and verify that VIN and all settigns are correctly recorded.
3. My vehicle has the fancy EURO SKE system. I didn't have to reprogram anything so not Erase or ro anything! No keys , not nothing. Just select SKE PATS and MODULE INITIALIZATION. This will pair the PCM with BCU, will generate the incode autmatically and it takes no more than 30 seconds.
That was all, I re-installed the COBB AP, flashed my Freektune map and went for a ride.
For the forum records, we can do almost anything with FORscan including VIN clone, etc.
My case was that my ECU has gone Joe Biden and that resulted in a loss of power from 350whp to about 200 whp after the car was in service for something else. I could only guess the stupid mechanic removed the ECU without disconnecting the battery and that effed up the injector drivers. Found some elco shorted too, anyway. I purchased the new ECU and all was simple. (I will repair the old one to have it as a spare part)
Procedure to replace the ECU
1. uninstal lthe COBB APP. Then run FORScan - with the original ECU SAVE the PCM data: such asVIN, tyres and Body type (MAZDA EU or Norht MAerica, etc). You may also goto https://www.motorcraftservice.com/AsBuilt and download the complete AsBuilt settings for your vehicle (VIN required) in an AB file. This is also useful if you replace the Body Control Unit with a virgin one, you have it all in one file.
2. With the new ECU, in FORscan just upload the data saved on step one into PCM IC and write it. Cycle the keys and verify that VIN and all settigns are correctly recorded.
3. My vehicle has the fancy EURO SKE system. I didn't have to reprogram anything so not Erase or ro anything! No keys , not nothing. Just select SKE PATS and MODULE INITIALIZATION. This will pair the PCM with BCU, will generate the incode autmatically and it takes no more than 30 seconds.
That was all, I re-installed the COBB AP, flashed my Freektune map and went for a ride.
Is there anyway we can copy and pin that specific reply to this post as a separate topic?
Awafrican
Moderator
could quote it, copy the text it gives you and use that to create a new thread then I can pin it
After what feels like two years of headache after headache, tons and tons of research, I can confirm this works even with a used ECU.
The steps are a little more complicated than what is posted here and PATS have to be relearned/reprogrammed if you have a used ECU. Which forscan and a usb-obdii dongle you can do all of it with some effort. There is more to learn still as I need to finesse it a little.
But this does work.
Willy_wonks_877
Greenie N00B Member
Hey, I’ve stumbled upon this thread after encountering similar issues in my ms3 gen 1 2009. I’m looking through and wondering how much of this I do and don’t need to do.
I recently brought mine in for an inspection to figure out why I’m losing almost 100 miles per tank, and the mechanic came back with 3 engine codes pointing to either a faulty wire to bank 1(unlikely) or a shorted ECU. Looking online a preprogrammed ecu is roughly 650. If I buy this is it as simple as plug and play to swap the new one with the old one, or am I going to have to go through this entire process to match the pats.
I have two keys and if I can’t figure out the software/a laptop I can get my buddy whose a tech wizard to help me out, but I want to know how much I’ll need to do.
I recently brought mine in for an inspection to figure out why I’m losing almost 100 miles per tank, and the mechanic came back with 3 engine codes pointing to either a faulty wire to bank 1(unlikely) or a shorted ECU. Looking online a preprogrammed ecu is roughly 650. If I buy this is it as simple as plug and play to swap the new one with the old one, or am I going to have to go through this entire process to match the pats.
I have two keys and if I can’t figure out the software/a laptop I can get my buddy whose a tech wizard to help me out, but I want to know how much I’ll need to do.