JDM ECU vs USDM ECU

by **streetceli88`** » Thu Aug 02, 2012 4:10 pm

Anyone out there running a swap with the JDM ECU in a USDM 1990 All Trac? not sure if pins are the same

by **fussellbug** » Thu Aug 02, 2012 6:42 pm

It's best to use the ECU and harness that were meant for the engine you have. ie: JDM engine with JDM harness and ECU

It is possible to use any 2nd Gen 3S-GTE ECU with any 2nd Gen engine but there are differences in the sensors/wiring/ECU pinouts between JDM and USDM that make it easiest to use the combination that was originally put together by Toyota.

3S-GTE ECU pinouts: http://www.ts-ogn.no/files/3sgte-ecu-pinout.htm

by **celigts** » Thu Aug 02, 2012 8:20 pm

What will happen if a usdm ecu us used on a jdm motor?

by **4rsnduction** » Thu Aug 02, 2012 9:12 pm

Assuming the pins all line up the worst u will get is engine running little rough

by **underscore** » Thu Aug 02, 2012 9:16 pm

USDM ECU on a JDM motor would maybe lose you a couple HP, but it might be better for the car if you have to run lower grade fuel.

by **celigts** » Thu Aug 02, 2012 9:47 pm

I just started runnin 94 now cuz husky here has 12cents off 94octane on Fridays! But have been running 92 since the swap

by **underscore** » Thu Aug 02, 2012 10:20 pm

I run 94 all day erry day, since after conversion I think the US equivalent to the JDM gas the JDM ECU wants is 95 or something.

by **celigts** » Thu Aug 02, 2012 11:33 pm

Close enough then lol. Wouldn't cause any seriouse damage would it. Like cause rings to go or headgasket to blow

by **streetceli88`** » Fri Aug 03, 2012 12:44 am

yea i been running 93 octane hear in NY and shes been running fine, dont even know if ill bother swappin the ECUs out.
Unless some has hands on expierence witha noticable increase in power??