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Possible PRB damage ?

Posted: Fri Aug 15, 2025 8:02 am
by Noxx
So I replaced my relays in my Elise chassis from standard to polarized relays (I didn't think it would make a difference). However, I noticed that my wiring was reversed for the coil side of the fuel pump relay. It means that the ECU possibly received unrestricted power from the coil wiring when the diode in the relay shorted. The car was working fine before that and now (even with the old relays), it doesn't want to start. In KManager, I get the Kpro Online status but 'Ignition Off' indicator even though it's on.

I suspect that the power damaged something on the PRB board when it tried to pull E1 and/or E7 to the ground. I tried finding info online but it's very minimal. When I look at the board, I don't see anything out of the ordinary. Is there a reference sheet for specific components somewhere (ex: R232) ? Is Hondata capable of repairing my PRB ECU ? They are expensive nowadays.

Thanks!

Re: Possible PRB damage ?

Posted: Fri Aug 15, 2025 9:36 am
by Spunkster
What is the serial number that is on the K-Pro board inside the ECU?

Re: Possible PRB damage ?

Posted: Fri Aug 15, 2025 9:59 am
by Noxx
Where is that located ? Is that on the K-Pro4 foil sticker ? If so it's 47763. Or do you mean the sticker on the E connector ?

Re: Possible PRB damage ?

Posted: Sun Sep 14, 2025 9:58 pm
by Withing
Are you checking the number to flash a new map or just to verify the serial?

Re: Possible PRB damage ?

Posted: Mon Sep 15, 2025 3:33 am
by Noxx
I could only find that the transistor Q160 was dead. I could not find the other dead transistor.

I ended up buying another ECU...