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Old 04-18-2018, 04:37 PM   #1
TyranosaurusWRX
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Default Issues: 2004 ECU swap in a 2005 ...STi

Thanks to an unstable laptop I bricked my ECU in my 05 STi flashing a map via Ecuflash. Turned out there was a burnt component on the circuit board anyways that was causing me fueling issues. I was able to obtain a 2004 STi ecu. Comparing notes on the pinout diagrams I rewired the harness to match the 5 different wires to feed the 04. I've went over the wiring a few times, it appears to be correct.
I'm still not getting any feedback from the ecu. I connect the flash mode connectors and it doesn't go into test mode. I'm wondering if there is some step I am missing? Seemed pretty straightforward but it's a no go as it sits now.
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Old 04-18-2018, 08:06 PM   #2
TyranosaurusWRX
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Looks like I had a bad connection on one of my splices. Car goes into test mode now. Just can't get ecuflash to connect to any way, let alone this one.
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Old 04-23-2018, 09:51 AM   #3
TyranosaurusWRX
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Looking for advice from anyone who's done this. I'm wondering if there is something I overlooked.....
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Old 04-23-2018, 06:12 PM   #4
TyranosaurusWRX
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This is what I have gathered so far between the ECU differences that need to be put togther:

2004 ECU ======================2005 ECU (harness side)

B135-27 =====VEHICLE SPEED SENSOR===== B135-26
B137-16 =========AC SWITCH========== B137-17
B137-15 =======IGNITION SWITCH======== B137-14
B137-14 ======TEST MODE CONNECTOR==== B137-15
B135-26 ==== FUEL PUMP CNTRL UNIT SIGNAL 1 === B135-27


Pinout downloads http://www.northursalia.com/modifica...ng/wiring.html



This leaves B137-17 unassigned on the 2004 , and B137-16 on the 2005 side unassigned. Oddly I do not get flash mode without connecting these two together, which according to the above shoudn't even matter.

Last edited by TyranosaurusWRX; 04-23-2018 at 06:29 PM.
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Old 05-01-2018, 08:27 AM   #5
TyranosaurusWRX
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If anyone needs this for future reference, the ecu was locked. The above pinouts (all of them) are correct and the car now runs. Much thanks to the "How to Unbrick an ECU. Like A Boss!" thread.
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Old 03-26-2020, 02:39 PM   #6
Ricco
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So by using a 2004 STI ECU on a 2005 STI, do you bypass the immobilizer stuff? So I could use a regular (non immobilizer) key on a 2005 STI?
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Old 03-27-2020, 05:19 PM   #7
TyranosaurusWRX
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Yep, I used a 2004 ecu because my 2005 had a burnt spot where something shorted. Swapped in the 2004, changed the necessary wires around, and now I can use the keys that came with the 2005 without worrying about the immobilizer.

I did however lose my cruise control. The cruise light will come on but it will not set.
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Old 03-31-2020, 09:37 AM   #8
Ricco
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Quote:
Originally Posted by TyranosaurusWRX View Post
Yep, I used a 2004 ecu because my 2005 had a burnt spot where something shorted. Swapped in the 2004, changed the necessary wires around, and now I can use the keys that came with the 2005 without worrying about the immobilizer.

I did however lose my cruise control. The cruise light will come on but it will not set.
Oh man, I wouldn't want to looe Cruise Control.. Have you done any troubleshootng?
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Old 04-04-2020, 10:49 AM   #9
TyranosaurusWRX
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Sti/ 93 Leg Wag

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Quote:
Originally Posted by Ricco View Post
Oh man, I wouldn't want to looe Cruise Control.. Have you done any troubleshootng?
Yeah that sucks. I don't drive the STi long distance very often so I haven't done much troubleshooting, I've had a lot of other unrelated issues to work out. I've seen others say the same thing though. I'm hoping it's a wiring issue and not just some incompatibility thing

Last edited by TyranosaurusWRX; 04-06-2020 at 08:58 AM.
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Old 04-27-2020, 02:42 PM   #10
EliGoethel
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Hey, I am trying the same swap but a 04 sti ecu into my 05 forester.

I did notice that according to my pinout diagrams the 05 FXT test mode connector is 12v when the sti one is 5v, unfortunately that was after I hooked it up. Also, my FXT ignition switch is documented to be in B137 - 16 instead of your 14.

Also, I am having major issues with no response from the new ecu, and after testing pins out of the wiring harness I think that I am not getting the correct IGN, test mode connector, and A/C voltage redouts. one stars at 12v constant in any key position and the others do not get any voltage.

My question for you is if you tested the pins did they match the documentation, and how did you know your ecu was locked? Did you leave your immobilizer box plugged in? Any suggestions on what I can check? My fuses seem fine.
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