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Can you use a usdm stock wiring harness and ecu on a jdm 3sgte 2nd gen motor?
Meandmy2
I have read that if you change the intake and exhaust manifolds from a USDM engine to the JDM, that you can. Theoretically, they are the same block and head, but US emissions standards require more sensors for a cleaner exhaust. Not quite. The emissions standards in Japan have been higher than the US for many years. Secondly, the head is not drilled for EGR on the JDM engines, nor is the intake manifold, but the engines will run just fine without the EGR systems, and only California emissions model cars have a sensor to turn on the Check Engine Light if the EGR system is removed. The only other changes that would need to be made to run a JDM engine with a USDM harness and ecu is to change the oxygen sensor from the 1 wire unheated JDM sensor to a 4 wire US spec oxygen sensor. The JDM engine will also have a exhaust temp sensor after the primary catalytic converter that is unused on USDM cars, and there is no connector in the USDM harness for it. I have heard it was used for a light on the dash as a warning on righ hand drive JDM vehicles and so is completely useless in a US spec car.
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