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Old 02-21-2006, 05:31 PM   #1
Scooby Guru
Member#: 8808
Join Date: Jul 2001
Chapter/Region: NESIC
Location: WRJ, VT
2011 WRX

Question Any ideas of what's different between manual and auto ECUs?

I'm trying to figure out the actual difference between the automatic and manual ECUs in the WRX, specifically related to the MY02 WRX. I've previously done a manual transmission conversion on my AT WRX, including grounding the appropriate pin on the ECU harness. This prevented the car from getting communication failures with the TCU and started behaving just as an MT car should.

However, upon reflashing my ECU, I found that the car insisted on using the AT boost maps, not the MT maps. My ECU, an AF411, has identical CPU and TPU ROM to an AF421 MT ECU.

Is there a physical difference between the two ECUs that will inform one ROM that it is running on an AT car, and the other that it's on an MT car? Are the ECus physically identical? Can they be swapped between vehicles and behave just the same as the original ECU in the car?

That is, has anyone here actually used a factory automatic ECU in a factory manual car, or vice versa?


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Old 09-07-2006, 02:30 AM   #2
Scooby Newbie
Member#: 125238
Join Date: Sep 2006

G'day Kha0s, just wanted to say that you and I are like minded in that, I too want to convert my MY02 Automatic Impreza to have manual transmission. I have yet to do it however, I was interested to find out specific details such as the third pedal addition (clutch). Did you have any problems with the general conversion and so on. How did you go with the ECU MT mapping??

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