Theory, part II........
 

Not saying the stopscrew is not the reference, just warning people not to base further leaps of theory on this one, until it's proven/disproven.

Your silicon theory is equally valid, or the motor unit could have a return spring......we aren't sure yet.

S

Yes I believe so. The currents increase significantly when met with immovable resistance.

There would be no need for a hard limit if the absolute value of the stepper motor was known by the ECU.

Still just supposition, most of the encoders I am used to at work are just a slotted disk with a photosensor. But given the turn rate on this thing, I doubt it. Maybe hall-effect?

Hall effect and photo-sensors usually indicate that steps have occurred. The resulting pulses go to a counter that determines position from a reference location. I believe some stepping motors have internal digital encoders but this requires a multi-wire signal cable coming back from the motor. In the electrical diagram of the MOP stepper, the motor appears to have only power cables.

The motor is run on a PWM signal.

are we thinking too damn much on this? I know I do at times. I dont think the pcm is that smart. Shutter to think that it is. If it is then why the hell are some cars NOT using any oil when they should be anyway? And if it is that smart then why build a set screw in the 1st place. as mentioned it seems most likely to me that resistance stops the thing?
Wish I had the time to fool with this right now. But mine is a daily driver kind of thing.
olddragger

Yes it would be nice if someone could put this thing on a bench, apply oil pressure to the input, position the sector gear by hand, and plot output versus gear position.

As an explanation of why there is so much variation, I'm still wondering if the valve opening is so small that small variations have a large effect on flow. The flow through a small opening, say a tube, varies as the fourth power of the diameter. That is if the diameter doubles, the flow goes up sixteen times.

I did a calculation to determine the diameter of a quarter-inch long opening that would flow about half a cubic centimeter of oil per minute with a driving pressure of fifty pounds per square inch. I got approximately five thou. If that is increased(decreased) by one thou, the flow rate triples (drops to a quarter).

Mazda knows all this so it's all speculation.

MM, how do you know your OMP is not injecting the right amount of oil (or any)? Did you disconnect the lines with the engine running and measure the flow?

is there a procedure to measure the renesis omp flow by disconnecting the lines and runing the engine at a certain rpm for a minute or so while collecting the oil and measuring it like there is for other 13B's?

It gets curioser
 

I just noticed in the manual that there is a nozzle where the oil is injected into the housing. It has an 'air' line connected to it and is tested by applying vacuum to it. Is this yet another level of oil injection control?

has anyone gotten anywhere with this?
OD

In case anyone wants some spare parts or to play around with one...
I bought an AT steering wheel from this guy and got it with no problems... he seems to be a good seller...

http://cgi.ebay.com/ebaymotors/ws/eB...ADME:B:EF:US:2

-C

I would appreciate it if you would check to see if the sensor is a switch or a variable resistor. Thanks.

I do not know what you are smoking ,but mine has 6 wires.I will post a picture if you wish.

It is a switch.I have a spare MOP which I will donate if you wish to play with it.Send me a PM

Yes, 6 wires on the MOP stepper motor/servo and no, the position sensor is a pot.

Thanks two rotors. I will PM you.

Where are you Chamberlin?
If this is a pot, what is it's resistance.

The schematic shows 6 wires from the stepper, two from the sensor.

1.5k

Don't be shttiing me now!
Do you ever sleep?

No. I'm a Vampire.
I'll sleep when I'm dead.

OK it has switch like functions
 

sorry about that,it just functions as a switch.

I guess that blows up this idea...

yep---but nice try. learned a lot. Now we know why racing beat did what they did.
olddragger

Would've been nice to have that OMP diagnostic earlier.
Its not in the FSM.

[QUOTE=MazdaManiac;1974642]Would've been nice to have that OMP diagnostic earlier.
Its not in the FSM.[/QUOTE

True,but it was inferred.I started looking at the DTCs in the FSM,but it was not clear to me,so I went to the Service Highlights.I will try to be more prompt next time

The FSM has a bunch of anomalies, so when something shows up in a schematic as a switch when it is actually a pot, I get curious.