My OMP killed my S5 turbo ECU's stepper motor. Is that also called a pressor sensor?. If so... I just need that instead of buying the whole ECU. Very difficult finding a N370.

I'm rather confused about what you are saying.

The stepper motor is a part within the metering oil-pump itself, not in the ECU. The pressure sensor is a part separate from the ECU as well, and is located on the passenger strut tower. There is an atmospheric pressure sensor located within the ECU -- but that rarely if ever is an issue. If your OMP killed the ECU, it likely killed the circuits that drive the stepper motor. You can either try to repair those defective parts, chip the ECU to eliminate "limp" mode, or replace the ECU/OMP.

Thanks man I was confused where the locations and operations. I'm looking for a N370. Icemark rebuilder ECU but he passed and I plan on running the OMP so the Rtek chip won't do me any good. I hear premixing gets expensive in the long run.

N370 ecu's are indeed hard to find. There are two pressure sensors for the car, a map sensor for the engine bolted to the pass. side strut tower and one in the ecu for barometric. If your only threw a code for the MAP sensor start investigating there first. What all codes did it throw? Usually a car with a failed MOP will drive ok for a few minutes before going into limp mode.

Just to add for posterity, even if the OMP has failed, the ECU will default it to 50% load for oil injection so if you kill the car and restart when it goes into limp mode, you aren't tearing the engine up.

There was no Codes. but from research in the Forums all the fingers point to the OMP and ECU no mater what.

Some get codes and some doesn't :scratch:

Iv'e restarted the 7 several times and goes limp mode every time after 5 min driving.


sometimes it will give me a false alarm limp mode for 2 seconds:scratch: and then in a few minutes BOOM LIMP MODE!:icon_tdow

You can always use an N374. The N374 has a top-speed fuel cut that gets falsely triggered on the N370 harness, so you have to remove a pin to prevent that from happening. Can't recall which at the moment, but it's not difficult to figure out.

I believe it's pin 1M.

interesting choice.. Never heard of using the N374. How do I remove the pin? Location pic?

any photo where that might be?

We're talking about a 374 ECU and not the one you have. And the pin out for the ECU is found in the FSM. In a particular plug, pin A is top row far right and pin B would be below that pin. Pin C would be to the left of pin A. And this is viewed from the rear of the plug.

i can look it up in the JDM diagram, but its one of the mileage switches in a US car.

we've posted it before too

I got it from the thread where a poster had a car going into fuel cut and had a JDM ECU and you provided the pin location.

i remember that! lol, i don't remember what pin it is (1M sounds right), but i know where to look it up again!

3rd page from this thread, post #59: https://www.rx7club.com/2nd-generati...1071632/page2/