I'm pretty sure it's only a 2 layer PWB (Printed Wiring Board), component side & solder side. There are no internal ground planes or voltage planes. 4 traces going to the negative leg would make sense since there is no internal ground plane. Be glad it's a 2-layer board, because you can literally run ECW's (Engineering Change Wires) in place of every trace. It'll be okay. If you have a Fluke meter, you should also have a good solder station. I recently had to replace my 30 year old one with a new Weller WE 1010NA.UPDATE!!!! I was finally able to pull koer codes!!! I pulled my eec back apart and one of the e-caps I replaced I must have got the board too hot with the soldering iron and burnt a trace off the board that connects the e-cap to I think the processor.i could see a open spot in the trace and verified with my fluke meter it was open. So I soldered A wire in its place. Now I wonder if I messed up more than just that because on some of the e-caps 1 leg only has one trace going to it while the 2nd leg will have up to 4 traces going to it (checked by shining a flashlight from underneath to look through the board)??? The one I fixed though allowed me to finally dump koer codes although I don’t think they mean anything in my case as I believe they are all related to my missing emissions equipment. So here are my codes koeo= 31,81,82,85,84 CM= 31 koer= 94,44,31 and passed cyl bal test with a 9 four times. So my conclusion is I did more harm than good replacing the e-caps or they leaked so bad they messed up the board. Since none of my codes point to any bad sensors or anything that would cause my drivability problems. Does everyone agree? Have any input? What’s the cheapest/best route to get a new or refurbished A9L?
So would anyone else agree since
There are almost no A9L's or any EEC-IV's available, since 30 year old electronics are considered salvage & melted down for the rare metals, i.e. gold, silver, copper, etc.