I want to rewire my ignition system. I put someone elses coils in my car, and still no spark. I check the connector, and still, no power. So I think there might be a short or something in the wiring harness. Is there a way to check to see if the CAS is working properly. If it is, if someone could get a schematic and highlight the wires that I would need to replace, that would be great. I would like to see it from the coils all the way to the plugs that go into the ECU. I really think that now the problem is the connection somewhere and I would like to find out where it is. I also hooked up a plug into a five sided box that bolts into the driverside kick panel with two bolts, what is that for? And then I have one more connector that is just hanging there, is there suppose to be an extra connector for like diagnosing? Thanks guys, I know I have a lot of questions, but this car is very different from my first gen.

 

Since I see ReTED and the other wankel gerus floating around, maybe you could help me on this. All I really need is that schematic. Thanks.

 

First, check the CAS. Disconnect the plug, meter across the Green and blue wires, then the red and white wires with an ohmmeter. Each should read 110-210 ohms. If ok, remove the black plate. Check to see that all metal poles are equidistant from the rotating pole. If ok, the CAS should be fine, reconnect. Next, go to the leading coil. The black/yellow stripe should be 12V, the green/yellow stripe wire should be either 0V or 5V. When the car is cranking, the green/yellow stripe wire should toggle between 0V and 5V. It is connected to the ECU. The 12V wire goes to the Main Relay. If you have 12V but no signal, check ECU power. There should be 12V at pins 3I and 3J, ignition on. All power for above comes from 3 fuses: Main box by the battery, ECU INJ and ECU COMP fuses, and on the fuse panel above the driver's pedals, the middle fuse, 4th row from bottom (7.5 amp). You can get the wiring diagram by downloading section 50 of the tech manual from FC3S.org. Good luck.

Irv, Keith's dad

 

Hey thanks a bunch on checking the CAS. Also, in the manual is there a section that tells you which fuses are suppose to go where in the fuse box by the pedals? Those fuses in the engine bay are in good working order, and the fuse box by the pedals, not all of those fuses are in there, so I have to figure out which ones to buy.
And does this page tell me what wires go to those pins? I am not getting any power to the black and yellow wire. I am also grounding the negative to the battery, is that the right thing to do? But I do know that the coils are in good shape. And I have that extra connector by the pedals to figure out, well thanks again.

 

I put the ECU schematics at this post: 88 Jspec won Ignite The screws that run this site won't let me attach the jpeg since I did it on the other post. OOOPS! The screws are watching: here, https://www.rx7club.com/forum/showth...threadid=61464

 

You can imbed it in the post, right click and get the properties, then paste it into the IMG part of the reply box if you don't know the code.

 

Okay, you have no voltage on the black/yellow stripe wire. This voltage comes via the main relay. How is the main relay picked, you ask? This comes from the ignition switch to the fuse box above the pedals. The fuse in question is in the third row from the bottom, second from the left (15A). A black/white stripe wire goes from the fuse to the relay coil, and exits the other side of the relay as a black (direct to ground) wire. Withe the ignition on, there should be 12V on the main relay at the black/white wire, and, since the other side is wired directly to ground, the relay should pick (fire?). If it does not, bad relay.

Let's suppose that the relay picks. The voltage supplied to the relay for the ignition coils is a black/green stripe wire, that comes from the EGI INJ fuse in the engine compartment behind the battery. As the name implies, if you don't have this voltage on the other side of the relay (black/yellow stripe wire), not only do you not get spark, but there is no voltage supplied to the injectors for the ECU to ground, which means no fuel either. Again, if the black/green stripe wire has voltage, when the relay picks (ignition turned on), there should be voltage on the black/yellow stripe wire. If there isn't, get another main relay.

Well, there you have it. Now, go fix it!

Irv, Keith's dad

 

Thanks to all for the helpful replies. I am having troubles downloading the tech manual, so maybe one of you can help me. I went out and bought a package of fuses, and was wondering if someone could tell me where each one goes starting at the top left corner. And this relay, it's black right? Thanks.

 

The relay you were talking about, are they black? The two black things at the top corners of my fuse box are my relays right?