So, I thought I had the problem figured out with the ECU...but I was wrong. I have installed two different ECU's, and have not fixed my problems. I now have three ECU's, and depending on what is actually connected, I get the TDC code, the CYP code, and/or the CKP code. The resistance for all three at the ECU checks out fine...I am at a loss. Any ideas? Is it possible that with different indications it is pointing to a timing belt that jumped teeth? Could something else cause this? Help please!

 

Suggest tracing ground from ECU to body ground. This would be a common fault that would cause the codes. Check pins A26 and B2 to ECU connector for grounding.

Are these codes returning immediately after an ECU reset? If yes, this suggests a "hard fault" that should be detectable. It must be somewhere on ECU apparently, but since multiple ECU's the problem may be external ground path.

A tough problem. My sympathies.

good luck

 

I'm going to check those pins, but I have a feeling that is not the problem. The CEL does not return immediately, upon restarting with a different ECU plugged in, but it doesn't take long at all. The most confusing part in my opinion is that it changes. I checked it today, and got codes 8 and 9. Then i did some work that had nothing to do with this portion of the system, and was getting code 4 and 9. I know it's all related, I just don't know how. I'm about to break down and take it to a shop...

 

I also just checked the connectors for A26 and B2 to ground, and got solid grounds on both. Just to make sure I did that correctly, I just checked the continuity of the connectors themselves...not actually the ECU.

 

The only scenario I can envision is a dynamic distributor problem that does not appear statically, but occurs when distributor is turning. It could be a intermittent coil in the pickup sensor/s, or perhaps a wobbling distributor shaft causing a signal fault (although code says a circuit fault).

You may want to consider a distributor replacement.

good luck

 

So it appears as though I had a combination problem. I had put a new distributor in when all this started that didn't help anything but appeared to be in much better condition than my old one, so I left it installed. In the end, it appears as though the new distributor was causing problems. So all I needed was a new PCU in the beginning, but thanks to faulty replacement parts, could not figure that out. So I got the new PCU installed with the old distributor today, and the CEL went out and stayed out, but the car was still running rough. I decided to change the plugs and wires, and she is running like a champ now! Thanks for all the help on this one!

 

Thanks for the post. I am glad you figured it out.