Hello,
I have a 1550-1500 JDM P30 ECU in my Vtec Mini (b16a2) and vtec stopped working.
I took it off the road a week ago to do some work on it that I had needed to do for a while, and tonight I thought I would have a look in the ECU, as I chipped it ready to pull some ODB1 data out of it for logging.
Anyway, long story short, I can see corrosion on the board around IC13 and IC14.
This ECU was an Auto, so it has all 4 of those IC's, IC13, IC14, IC15 and IC16.
To my understanding, IC15 and IC16 are not required for Manual Vtec, they are for Auto. Is this correct?
I removed IC13 and IC14 as the board under them was shocking. I thought I would then have IC15 and IC16 as spares in case I needed them.
This is what I am looking at.
Coloured arrows indicate what I think should be continuity.
C71, which is next to C72 there, was black. its upper terminal is isolated from the bottom right pin of IC14, and also from that via to its right. That via jumps over to the via tot he left of C70. Those two vias are still continuous, but no longer to the IC14 pin or to C71.
The track going between IC13 and IC14 indicated by another coloured arrow, is high resistance.
And then on IC13, that track indicated there is still continuous, but it doesnt look very healthy.
I basically need some advise please.
What is the best course of action.
I have cleaned it up a bit more that the photo, however that photo is a huge amount cleaner than what it looked like before I started cleaning it up.
I'm tempted to scrape off the solder mask on some of the tracks and put on a little jumper wire to fix the bad connections, but as to what to do about C71, I am not 100% certain. Even C70 doesnt look very happy, none of those 4 do really.
They all seem to be decoupling caps of some kind, to ground, so that makes life a little easier I guess. I could relocate them and solder something direct to the IC13 and IC14 legs if required.
If anyone has suggestions, that would be great.
If anyone has a schematic of this area, that would also be hugely appreciated.
It would be really neat if I could substitute IC15 and IC16 to do the job of IC13 and IC14 by cutting and joining tracks, and leave this bad area of the board alone as much as possible.
Please assist
Thanks