Hi fellas, I REALLY NEED A PROFESSIONAL INFORMATION!
I need to know how the electronics on the OMP works! I need to know because I removed all my original engine harness, vacuum lines and ECU to put a Fueltech FT550 to runing all my engine and the rest of the car will work over the original harness but without original ECU. I already removed the A/C system, power steering, air pump, ABS system, airbag system and will clean all my engine bay. Anyone can send me the electronics esquematics of the OMP pump? I want to hold her working! Please, comments like "delete it" or "premix it" don't help me in my project so please hold then to yourselfs. Thanks

 

First thing you should do is download the factory shop manual (FSM) and wiring diagram, there are links to it on this site. That wiring diagram will show how the OMP is wired in to the stock FD ECU, and also tell you enough about the internal workings of the OMP so you can figure out how to wire it to work with an aftermarket ECU, assuming the ECU has the available I/O and its software can support that function.

 

Thanks for answering but the route and the pins on ECU I already found. I need to know is the work of the parts inside the OMP. I know she has a stepper motor inside and other sensors now I need to know the "logical" and the "voltage" of the functions to programing this on my new ECU.

 

It is a simple stepper motor with 2 pairs of coils, i.e., each pair shares a common power connection, see schematic excerpt from the FSM:



And then there is just a simple potentiometer that is used as a position sensor to tell the ECU where the stepper motor is at any given moment:


Now depending on how your ECU is set up to drive a stepper motor, you may have multiple options (more on that later). The Link G4+ in my FD operates the motor the exact same way Mazda did - unipolar 6-wire drive. Power (+12V) is applied to the 2 common coil pair terminals (B/W wires in schematic) and you need to use 4 of the ECU outputs to connect to each of the coil legs (B/O, B/LG, B/L and B/Y wires shown). In operation, the ECU pulls each coil leg to ground in sequence as needed to energize the coils and move the stepper to the correct position. An analog input on the ECU is connected to the position sensor, which obtains power from the ECU's +5VDC sensor power out & sensor ground lines, so the 0 to 5V output from the sensor connects to the ECU's analog input and provides feedback on stepper position And that's where the ECU's firmware/software magic comes into play - in my Link ECU, it already has the logic & provisions to drive an OMP; the user can then play with the map for oil delivery rate. In the Link, OMP oil delivery (% open from 0 to 100%) is controlled by 3D map based on engine load (MAP), and engine speed (RPMs). It also has fail safe logic built in so that if stepper position isn't tracking with position (within a set % tolerance), it can put the car in a limp home mode similar to the factory ECU.

Some ECUs, like the AEM Infinity I have in my FC, operate the OMP stepper motor in a Bipolar (4 wire) mode instead. In that case, you'll leave the B/W common power wire unconnected to anything. The ECU will have 2 stepper drive output channels, each output will have a HIGH (+) and LOW (-) wire; so one pair will be B/O & B/LG coil pair, and the other will be B/L & B/Y pair. Programming and logic is similar to the Link, but the motor drive is different.

 

Wow! It's a class! Thanks for your time and help! Here in Brazil anyone don't know anything about these Rotary things! Thank you! I'll start do do this job!

 

Bumping this because it should never be forgotten.

What are the settings to get the stepper motor pairs working correctly?

 

added to FAQ
Some interesting threads on the OMP in there. Like this one: https://www.rx7club.com/3rd-generati...sified-892750/