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Old Today, 07:11 PM   #1
Scooby Newbie
Member#: 269136
Join Date: Jan 2011
Chapter/Region: RMIC
Location: Boulder, Co
2005 WRX 2.0l wagon

Default Bad 2004 ECU on a 2005 WRX wagon with a 2003 JDM 5MT

I recently swapped my 4EAT for a 2003 5MT in my 2005 WRX wagon. Part of this process included a small amount of frankenstein-esque wiring, to mate the old AT harness up to the new MT.

After much online research, I determined that sometime around 2004 Subaru stopped making universal ECUs, and started making AT/MT specific ECUs, so I acquired a 2004 WRX 5MT ECU.

After installing the new (used) ECU, the car barely starts, and if it doesn't immediately die, it idles roughly somewhere below 500 RPM. It also throws up codes (P0129) about bad barometric pressure, as well as codes relating to all 4 cylinders misfiring.

When I reinstalled the original (AT) ECU, the car ran fine (excepting some weird noise when I turn too far that can't be related). No barometric pressure codes, only codes relating to the sudden lack of a TCU and ABS system.

At this point, it seems smartest (and really my only option) to keep running the old ECU. I was wondering, however, if the indications from the new ECU are indicative of a bad ECU, or perhaps something related to an Inhibitor Switch in the harness preventing other ECUs from working, or something else entirely. Any help at all would be appreciated. Thanks!
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