The Subaru SVX World Network - Stupid ECU Question

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- Technical Q & A (https://www.subaru-svx.net/forum/forumdisplay.php?f=5)

- - Stupid ECU Question (https://www.subaru-svx.net/forum/showthread.php?t=56542)

Geoff

02-10-2011 12:49 PM

Stupid ECU Question

Should an ECU from a '94 plug directly into a '92 without any issues? Any advantages/disadvantages to doing it?

1986nate

02-10-2011 01:57 PM

Re: Stupid ECU Question

94 ECU will look for the EGR temp sensor reading I believe. The 92 federal ECU was the best one to use FYI...

Jake@FAPFab

02-14-2011 01:21 PM

Re: Stupid ECU Question

yes, 94 will get pissed at no egr function

Geoff

05-21-2011 08:46 PM

Re: Stupid ECU Question

Just tried it! 94 ECU plugs into 92 car and works flawlessly. Just tried it. Did the ECU as well. Car runs MUCH, MUCH better with the 94 ECU with an EPROM on it that says "93 Cali / 94 All"

So, a 94 ECU will run a 92 perfectly. :D

b3lha

05-22-2011 03:30 AM

Re: Stupid ECU Question

Yeah. The ground wire for the EGR temp sensor is what switches to ECU to California mode. If you don't have an EGR temp sensor then the ECU pin isn't grounded and it uses 49-States mode, which is correct for a 92.

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