Car won't start after OEM ecu install...

[yugisama]

I had been running with my kpro for years and now I decided to swap back the OEM ecu in. But my car won't crank over after I install back my original OEM ecu. Anyone have any idea why? Thanks.

In case anyone wonder why I swap back is I been getting poor mpg (22 mpg) and hoping to see if it is the kpro problem. Plus I am planning on selling my ep3.

[Cheep3]

Assuming you had the immobilizer set to "off" on the Kpro, have you changed keys or anything since you last used the old ecu? I'm no expert but I would guess it has something to do with the immobilizer...

[yugisama]

I did had the immobilizer set to off when I am using the Kpro. I didn't change any key. Still the same one from the first day I brought my car. The only thing I could think of is I had disconnect the wire for immobilizer dash board light, since it keep flashing when I am using the kpro. Do you guys think that is the problem?

[Cheep3]

I'm sure someone on here knows more, but yeah, that wire might be it. I have to ask, are you planning on selling the Kpro?

[yugisama]

I'm sure someone on here knows more, but yeah, that wire might be it. I have to ask, are you planning on selling the Kpro?

Yes I am once I get it to work on my oem ecu tho

[OH10_EP3]

You will have to take it to the dealer to have the immobilizer removed, it will probably cost you around 60-80 bucks to do so.

Same thing happened in my EP3. I removed KPro, picked up a used ECU, couldn't get it to work, and returned it all pissed off. Turns out, the ECU was good along, after a trip to the dealer everything was golden.

[yugisama]

Well problem solved. It was the cable for the immobilizer dash light. Plug that back in and it fired right up. Thanks everyone :D