Ok, so I fried my transistor in the Q31 spot of the ecu board, on both my ecu's (stock cx and p28). Been searching on here and it says that the IAT plug is probably plugged into the wrong place. Before I check my plugs and order up some transistors, my question is - Is mines repairable?

here are some pictures:



back side of board


Need this fixed asap..got smog next month dam!! As if this couldn't happen at a better time!! O BTW, motor is is a d16z6 in a 94 cx with an obd1 gsr harness, if that matters any.

 

Unlikely, it may be worth a shot if you can clean up the contacts on the board though.

 

What can be used to clean those burned marks up?? If anything?

 

two of my ecu's did that... They are toasted even after replacing that Q31.

 

UUhh...that was what I was thinking but I'm gonna try to repair them anyways.

 

This maybe a dumb question but am I able to drive the car without it messing anything up (engine/electrical wise) as this is my dd and I am out of ecu's to use?

 

if you can solder well and know how to repare traces it's an easy fix. [I've repared far worse than this]
If you can't, fix the problem that caused this (common is EVAP and IAT plugs switched)
Then run it, it will not cause a CEL nor run the car any differently... other than never purging the EVAP system, which has zero performance drawbacks.

 

Soldering is no problem but I've never repaired traces before. Is it hard to replace the traces? and is there any DIY on trace repairing? Sorry to ask but not too big on repairing electronics/board. Need a place to start or some pointers.

 

Q31 is for the EVAP Purge circuitry. Ive had them fried pretty frequently and the ecu still works. As long as nothing else is fried/traces pulled up. It should work fine.

 

Yea, all my burnt ecu's still work fine just that the idle would be off 100-200 sometimes but other than that I'm still driving with it until I can get my p28 fixed. I want to see if I can fix them before I go out to buy one. I hope I don't have to because I'm already in a tight financial spot.Thanks for all the replies, this has helped a lot.

 

if you can chip an ECU, you can repare traces.
trace wire can be found at radioshack. (30awg works perfectly)

 

might be a dumb question but that exactly is a trace on an ecu? is it the map like lines?

 

trace = pc board wires = map like lines.

in the OP's pic
dark green = board
lighter green = traces(with the metallic silver contact points for parts to stick to/through)