legacycentral bbs

Well,
I have sorted out the starter issue from the other day that I mentioned in my other thread. I can get it to crank now. I just can't get the thing to spark and fire. I have checked all the usual suspects; fuel pump relay, connectors, etc. I am thinking it is one of two things:
1. I have an issue with my ground wires, which I will be checking later today

2. There are two connectors that I cannot identify and cannot find their mates? The FSM scans I have are cut in the middle and I cannot figure out what they are for or where they should go. They are both 4 plug connectors. One is pink and one is black. They have one yellow wire that joins them about 4 inches apart. All of their other wires either run to the fuse box or off into the main bulkhead wiring harness. And the biggest question is where the hell do I plug them in? I am pretty sure I unplugged them when I took the car apart, but can't find their mates. I feel like kind of an idiot but just don't know what I am missing...

Where are these connectors physically?

Can you list the colors of the wires?

They are physically on the left side of the driver's compartment. As mentioned one wire out of each of them runs to the driver's side fuse box. I am no longer at home, so can't give the exact colors, but they are basically the same black with red stripe that runs everywhere in the car for grounds. A black hot wire, the yellow wire that joins them and an "I don't remember the color wire" as the fourth. No doubt that wire runs to whatever sensor/solenoid/component they are affiliated with?

Hm...

Are the pins four-in-a-row or two-by-two?

When I get home this evening I'll try looking through the FSM for any indication of what those connectors are.

Does the Check Engine light come on when you turn the ignition on?

They are two by two. I can get you the exact colors tommorow if I cannot sort it out this evening. If you are using Josh's scans, you will have trouble sorting it out as that is what I am using.

Um, a CEL would suggest I have connected the dash...

I own a physical set of FSMs; that's what I'll look through.

Oh, right, I forgot the dash wasn't in yet.

You should find out if the CEL is coming on. That'll tell you if the ECU is powering up. Connect a small light bulb between the ECU's MIL pin and an ignition-switched +12v source.

http://forums.nasioc.com/forums/showthread.php?t=637023

May have found another issue. That ECU you sent me was from an auto, right?

p.s. THANKS JOSH!!!

I don't remember what type of transmission the car it came from had. If I told you it was an auto then it probably was.

I don't think that's an issue here though... If you can get the engine to turn over, the ECU should at least start sparking. If it doesn't get the starter signal it might not fuel right, but it should still spark.

There are some plugs under my dash on both sides that dont connect to anything. I think they are for extra stuff.

-Mike

vrg,
Any luck with the manuals? Turns out the black plug is a 5-er and the pink on is 4. I spent a couple of hours with the power supply routing diagram tracing my lines and checking my splices. Can't find the issue. But it is definitely some sort of power issue as the headlights don't work. Power windows and fuel pump do, but I have some sort of short in the front harness...

I'm sorry. Every time I am in a position to get to my manuals I forget, and then I remember on my way to school or something. I'll try harder to remember...

Dumb question -- they don't happen to plug into the fuse box, do they?

I think you really should hook up a CEL.

Hmm.

Sorry it took so long, but I finally looked through the FSM...

Could the black one be the diagnosis connector? I can't find much information about it here, but apparently it's supposed to remain not connected to anything, has a single-pin pigtail right near it on the same harness, and is a 4-pin black connector on non-airbag cars.

Still looking for what the pink one might be.

For what it's worth, the ECU's between an auto and manual should be the same. I've got the ecu from a 92 Turbo Auto in my 94 Turbo MT right now, and it works alright.

Well, that doesn't necessarily mean that the 94 WRX used the same ECUs in automatics and manuals. All non-turbo North American BC/BFs except for 92 models use different ECUs for different transmissions.

Oh I didn't know he was using a WRX ECU. I should have probably read a bit more... LOL.

I also didn't know that about the BC/BF ECU. The 92 is the same PN as my 94's, I made a generalization.

Yup... From my part numbers page:

22611AA564 90-91 5MT non-turbo ECU
22611AA383 90-91 4EAT non-turbo ECU
22611AA933 92 non-turbo ECU
22611AB060 93 5MT non-turbo ECU
22611AB052 93 4EAT non-turbo ECU
22611AB770 94 5MT non-turbo ECU
22611AB760 94 4EAT non-turbo ECU
22611AA694 turbo ECU

It is not the diagnostic connector. I have all four of those set aside.

Speaking of ECU's. Just for future reference a JDM JECS WRX ECU will NOT fit into a USDM JECS legacy turbo housing. The brakets inside the housings are very difference, and I was not able to make it fit in the other case you sent me. I am just gonna have to zip tie it to the bracing and have those crazy mounting legs sticking out from the ECU...

Hm. Well, until there's any evidence to the contrary, and assuming these connectors don't actually go into the fuse box, I would have to say I doubt they are the cause of your no-start condition.

Didja hook up the CEL yet?

Bummer about the ECU case... You can at least cut off the mounting arms, right? And maybe cut the studs with brackets off the stock ECU and epoxy them onto the new one?

Does the JDM ECU have an O2 monitor lamp? If it does, it will blink the codes.

I'm lazy. Can't bring myself to work on the wiring. I took apart an engine yesterday instead...

Finally making progress. Spent an hour The idiot that sold me the WRX wiring harness had patched the dropping resistor into the ECU connectors? WTF?
I also have an issue with the shield wire from the MAF, there isn't one on the old Legacy and the WRX ECU wants to see one. Lastly, I am still pretty sure I have a break in the circuit for the ground wires. I swear I will get this car running this week!!!

What part of the ECU harness did he patch the dropping resistor into?!

The old Legacy didn't have a shield on the MAF sensor signal wire? It should have, going to pin B48.19.

But even if you don't have the shield, it should still work. The WRX ECU shouldn't be able to tell the shield is missing, I don't think...

He had the dropping resistor to B43 5. I know that wouldn't keep the car from starting, but it was also wired into the ground and that wasn't connected, so I cut it out completely.

Yeah,
I am aware of where the shield pin needs to go. I am thinking I amy just wire in the MAF wires from the WRX harness. It would take about five minutes. The '90 Legacy harness has 5 wires and the WRX one only has 4. I am still not clear on the purpose of the 5th wire. I am also unsure if the JECS MAF you sold me it looking for 4 or 5 wires. Any thoughts?

And the interesting thing about the shield wire on the stock wiringin is that it connect to the check connectors and ground wires. Something tells me this is at the core of the issue in making this circuit complete because I cut out all the wires, including the shield, for the CPS, and haven't closed up that circuit yet. It still runs to and dead ends in the MSJ...

That's weird about the resistor.

The 5th pin of the MAF sensor harness is used by Hitachi ECUs/MAFs but not by JECS stuff. In fact, some of the JECS sensors don't even have that 5th pin in the connector, and even those that do don't have it connectde to anything internally.

The stock shield shouldn't connect to anything else... It's supposed to be grounded inside the ECU and nowhere else. That's what I thought anyway.

You could just try tapping the ground wires on the ECU and running your own ground from them to the engine, bypassing the super multiple junction entirely.

That's pretty much what I am doing. The WRX harness wasn't using the SMJ at all for the engine wiring harness and the biggest ECU connector. I just missed that those wires from the stock harness were still connected and not clipped out of the circuit yet. Pretty much any stock wire that went through the SMJ stock no longer does...