ERLoft Posted January 31, 2013 Share Posted January 31, 2013 For various reasons I've been considering replacing my ECM (ECU) with a stock, unflashed one. I have heard that supposedly the ECM and Immobilizer devices are a married unit, so if you replace the ECM only, the car will not run. Can anyone confirm or refute this? I'd like to figure out for sure before I spend the money on another ECM. Thanks! 2013 █S4 - Glacier White - DSG - B&O - Tech Package - Sports Diff - Napa - RS4 Grille - Stasis Exhaust - APR Intake - KW Variant 1 - Stern Control Arms - CR-15 - Stasis RSB - Moog Endlinks - PC Hyper Black Peelers - Deval Front Lip - ECS Rear Diffuser - Carbon Imports Ducktail - ECS Mirror Caps - Relak Paddle Extensions - Autostyle Floor Mats - LED Interior - V1 - Blackvue DR900s - [sIGPIC][/sIGPIC] Link to comment Share on other sites More sharing options...
Mr. Sinister Posted January 31, 2013 Share Posted January 31, 2013 Any reason why you don't want to just flash your ECU with a stock map? Link to comment Share on other sites More sharing options...
ERLoft Posted January 31, 2013 Author Share Posted January 31, 2013 I have a stock map. However... if you bring it in with a problem, they know you're ran a modified map, thereby voiding the warranty. I figured that out when piston #4 melted through no fault of the mapping I was running and Subaru only covered 50% of the replacement of the block. Since the repairs, I've run it on the stock map, stock exhaust, etc. The only power mod I have is my AVO intercooler at this point. I've been having a bit of roughness at idle - no codes or anything - but am reluctant to take it in to the dealership with that same ECM in the car, because they could just as easily deny any warranty coverage again... 2013 █S4 - Glacier White - DSG - B&O - Tech Package - Sports Diff - Napa - RS4 Grille - Stasis Exhaust - APR Intake - KW Variant 1 - Stern Control Arms - CR-15 - Stasis RSB - Moog Endlinks - PC Hyper Black Peelers - Deval Front Lip - ECS Rear Diffuser - Carbon Imports Ducktail - ECS Mirror Caps - Relak Paddle Extensions - Autostyle Floor Mats - LED Interior - V1 - Blackvue DR900s - [sIGPIC][/sIGPIC] Link to comment Share on other sites More sharing options...
frank_ster Posted February 1, 2013 Share Posted February 1, 2013 Flash it back to stock they probably won't fine out if you change ECM it would probably have a serial number on it and that would be more likely the cause for cancled warranty Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
Strizzy Posted February 1, 2013 Share Posted February 1, 2013 When swapping ECUs, you will have to reprogram the BIU and all your keys with the new ECU. This can only be done through a dealer, or if you know someone at a Subi dealer that can lend you the SSM after hours, and give you the correct codes to get into the ECU/BIU programming menus. My bad luck build Link to comment Share on other sites More sharing options...
frank_ster Posted February 1, 2013 Share Posted February 1, 2013 and the ecm knows the kms and they need to be correct also. Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
Strizzy Posted February 1, 2013 Share Posted February 1, 2013 My miles didn't change when I replaced my ECU. Unless the miles are stored in both, the cluster and ECU? My bad luck build Link to comment Share on other sites More sharing options...
frank_ster Posted February 1, 2013 Share Posted February 1, 2013 when reading the ecm with ssm it has its own odometer. and you can see the serial number.. so would could be done .. prior to modifying your car you get a new cluster, new body integrated unit and new ecm swap those out and keep them and then modify the ecm. then when you go to get waranty work done you put them back. Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
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