ECU Code Help

I just got my car started after some minor restoration. I purchased the car not really running so I don't have much of a driving history. However, we did a major service where the fuel system was rebuilt (new pumps and Injectors). Replaced Ignition wires plugs and several gaskets. I purchased the kit from Ricambi so everything that came with the kit was replaced. Anyhow, we got the car started and it idled very high. Found that the Idle stabilizers were bad so I replaced them. It now idles fine and sounds great. I put a Larini muffler and test pipes on it. I do however have three codes in the right ECU that we are sort of stuck with.

The ECU throws codes for bank 1-4. Those codes are 1111 (hot airflow meter), 1121 (RPM Sensor), and 4121 (Catalyzer Temp ECU). First method was to ohm the throttle body and found that the resistance on bank 1-4 to be .508. We removed the plug and made the adjustment to make the resistance .383. That did nothing for any of the codes. We then switched ECU's and nothing. After that, we switched Exhaust ECU's and nothing. Finally we switched the temp sensors in the exhaust. After all that, bank 5-8 is not illuminated and 1-4 is still illuminated. We did back probe the connectors for the temp sensors in the exhaust and they both probe out the same. Both have 12V and ground in the same places. We are a bit stuck without knowing theory of operation for the exhaust temp sensors. Can someone either explain how this system works or give us some help on diagnosis. We do not know where the splices run to and from. We also do not know what the sensors are sensing and what they are telling the ECU's.

 

Thanks for pointing out my car. Its tough to help when you have no idea what vehicle were even talking about. My bad! Rookie mistake.

With regards to the back probing. We did that at idle and with key on engine off.

The thermocouple was one of the items that I switched from side to side along with the Exhaust ECU's. No change with either of those. In addition, the weird thing is that with no cats, there cannot really be an issue with it being too hot.

Ill need to read the thread that you posted. One of the other issues that we are having is a code 1121 (RPM sensor) and the tach doesn't work. If there is some connection there, It would make sense. Hopefully that thread will tell us how to daig that. We are pretty much simply using the wiring schematic since we do not know theory of operation on most of these systems.

 

That’s what I was just researching. The code is for bank 1-4 for sure. Also, the tach doesn’t work. I was honoring for a twofer. Apparently my problems are most likely not related