JDM vs. USDM ecu (yellow plug)

supraheelfan · 08-22-2013, 07:38 PM

I didn't do the rewire myself a shop here locally did it. It's the second time they have done the rewire. Once with the original harness (problem was solved). Then I had this used auto harness swapped on the car and the code 52 came back so I had them do the rewire a second time, as well as check the actual sensors again. the problem is still here the only reason i said the sensors could be jdm and usdm is because one is original to the engine and one is not. For all I know they are the same.

I mostly wanted to see if anybody has had this problem and if a jdm engine needs a jdm ecu?
Also, why am I having such a hard time getting rid of this code 52? All the tsrm procedures have been performed by myself as well as other more qualified mechanics, but to no avail.

cre · 08-22-2013, 09:49 PM

Three things cause a code 52 (barring the really out there shit): bad sensor(s), bad wires, bad ECU. No the USDM ECU isn't the issue. I suspect the rewire didn't work and needs to be redone. The knock sensors could be shot (even if they were tested) as they're very delicate things and they really aren't all that easy to test (most shops, even Toyota's will tell you to just replace them at this age).

Here's a link to the shielded rewire which solves this problem for most owners: http://oldschool.supracentral.com/htm/knock.htm

08-22-2013, 07:38 PM	#1
supraheelfan 3" Exhaust Join Date: Feb 2011 Location: Wilmington, NC Posts: 178	I didn't do the rewire myself a shop here locally did it. It's the second time they have done the rewire. Once with the original harness (problem was solved). Then I had this used auto harness swapped on the car and the code 52 came back so I had them do the rewire a second time, as well as check the actual sensors again. the problem is still here the only reason i said the sensors could be jdm and usdm is because one is original to the engine and one is not. For all I know they are the same. I mostly wanted to see if anybody has had this problem and if a jdm engine needs a jdm ecu? Also, why am I having such a hard time getting rid of this code 52? All the tsrm procedures have been performed by myself as well as other more qualified mechanics, but to no avail. __________________ Anyone who has never made a mistake has never tried anything new. Last edited by supraheelfan; 08-22-2013 at 08:37 PM.

08-22-2013, 09:49 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Three things cause a code 52 (barring the really out there shit): bad sensor(s), bad wires, bad ECU. No the USDM ECU isn't the issue. I suspect the rewire didn't work and needs to be redone. The knock sensors could be shot (even if they were tested) as they're very delicate things and they really aren't all that easy to test (most shops, even Toyota's will tell you to just replace them at this age). Here's a link to the shielded rewire which solves this problem for most owners: http://oldschool.supracentral.com/htm/knock.htm __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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