sfortin

I might have fried the ECU on my 2002 WRX. Wondering two things: 1 - which ECU's are interchangeable. 2003 Impreza? Found a cheap ECU in scrap yard. Turbo car vs non make a difference? I know the tranny doesn't make any. 2 - Trying to find the right fuse/ fuses? to the ECU. Just in case the problem is that simple. anybody know any systems that are run by the ECU that I could test to see if they work with the key on? Thank you all... always great help! 1000 heads are better than one..

well, it looks pretty bad. Tried using my OBD scanner and it wont connect to ecu. My car also usually has engine light on for the p1596 code that i cant get rid of and now shows none. I don't know of any functions that are controlled by the ecu that i could test with out engine being on. wipers, heater, radio, windows, four ways all worked. The fog lights didn't. So, verdict? secondary question, is the ECU from a 2003 impreza the same as 2002 wrx? does the ecu have a fuse?

Hello all, I have been looking for this answer for a long time all over the place. I have a 2002 WRX manual. It was originally an automatic when produced, the previous owner got it switched to manual. The thing is I'm pretty sure the wire to tell the ECU it's a manual instead of automatic hasn't been put. I know the ECU is the same. I've looked everywhere on how to do this. Anybody have experience on this? I keep getting the error code P1596 caused by this I'm pretty sure. Thanks in advance.

I will scan it tonight and see if i can do basic things with the car that the ecu would control. I will post back the minute I know some more. I didn't un plug anything else during this. I did try and troubleshoot everything else in the fuel circuit such as the relay, the controller, the fuse and the pump itself. Check continuity in the entire line, power to the pump. Everything looks fine. That's why i decided to bypass all of that and try and get the pump working and starting the car. I thought, if car would start, pretty much would mean the problem was in the fuel circuit. But no start points to the only thing that is left, the ECU.

i cut the wire coming out of the ECU. it isn't a shielded wire. From what I can see from the wire diagram, the knock sensor has another wire coming from the ecu for the shield. Someone else told me that the ECU is not grounded through the bolts that hold it in place. I think IU wasn't careful when working with the ECU (few too many beers I think ). Live and learn, that's my goal. How could I tell that my ecu is toast? I ran the fuel pump and since it turned over but no start, the only things I messed with kind of tells me this. What do you think? I don't see how the security would stop car from starting. I make sure everything is unlocked. Anything else i'm missing here before I replace the ECU blindly?

Hello all, I have a 2002 WRX and I don't know how i could find out if my ecu is the problem. To start from the beginning, I was trying to find the output of my ECU that could turn it from automatic to manual in the hope of getting rid of p1596 error (automatic tranny diagnosis input signal high input). I made the mistake of of removing the ECU from the bolts that i now know that ground the ECU. I tried cutting one wire (which i found out that was for the knock sensor.. wrong electrical diagram) After i cut that wire, maybe 30 seconds later the car wouldn't start anymore. After re soldering the wire, i found that the fuel pump wasn't priming. After troubleshooting everything possible with the fuel pump, i replaced it thinking that was my issue. It didn't. Still wouldn't prime. I have tested all the wiring from the fuse all the way to fuel controller. All is good. I then thought to myself i will just bypass the whole line and wired 12 volt directly to the fuel pump to run it continuously to see if i could get the car started. With the pump running and car turning over, i get no start now. I assume that if the fuel pump is working now at full blast, will it drown the engine and prevent it from stopping? How do i know if i blew the ECU? thanks to anyone that can help me.