I need the pinouts for U4 of a v2.2 board....I already have the schematics from http://www.bgsoflex.com/v22/megasquirt_ShemV2.2.pdf but the pinouts for U4 are not listed.
I am trying to diagnose a reset problem with my system. (msns-e, 029q) running wasted spark using an error daughter card, with 2 vb921's firing a DSM coilpack... on a volvo b230 (with a b234 16v head).
I am getting resets (a lot of them) with just 12v power applied in the car, with the car not running.
I'm a bit of an electronics newb, but I'm learning as I go. To the experienced, I'm sure this post will seem a bit elementary, thus my request for pinouts instead of a "fix this" post
The reason I ask, is that one solution I found for the reset problem is:
(from http://www.msefi.com/viewtopic.php?t=20 ... eset+power)
However, I already have a wire connected to Pin6 of U4 going to T3 of the error daughter card (it is my understanding that T3 supplies the conditioned output to U4).I was getting many resets also. A wise man told me to remove the XG1/XG2 jumper, run a wire from XG1 to pin 6. Pin 6 is the sheld for the IGN input. Ground the sheld at the distributor input or wherever you got your IGN signal from. I did this and my resets went away. If you have already grounded that side of the shield you have created a ground loop, by grounding the MS in two places. By removing the jumper and grounding the sheild, you give the IGN ckt a seporate ground. I was getting 51 resets at idle over a 3 minute time span. ALL my resets went away after this mod.
How can I ground pin 6 of U4 AND have a wire connected to the error card?
Thus my asking for the U4 pinouts.... I think if I see them, then I can reason/learn my way around how U4 works.
many thanks.
Mike