Diary of a Madman; TitaniumTT's see you @ DGRRXI RE-REbuild

[RETed]

Originally Posted by vex

For the OMP you do need an input signal for position to have it work, however on the Haltech when running an ICV, it does not require the use of another input (as other sensors dictate the need and what not of the valve)--thus it stands to reason that if you can find a means of using the stepper motor without the extra need of an input you could mimic the same stepper motor controls with a predetermined startup routine.

Doesn't that get kinda dangerous?

I haven't researched this in detail, so there are a few assumptions...

I know it's a 4-position valve, so it's a 4-pole stepper motor.
Does it have limiters on min (1) and max (4)?
If it has limiters, then it's a little bit safer...
If it doesn't, then you can easily jump from min to max with one errant signal.

There has to be a reason why Mazda went with a feedback signal system.

You would think that the OMP system is important enough to have this feedback system functional.
It does throw a nasty error (which goes into limp-home mode) when triggered.


-Ted

[TitaniumTT]

Originally Posted by RETed

Doesn't that get kinda dangerous?

I haven't researched this in detail, so there are a few assumptions...

I know it's a 4-position valve, so it's a 4-pole stepper motor.
Does it have limiters on min (1) and max (4)?
If it has limiters, then it's a little bit safer...
If it doesn't, then you can easily jump from min to max with one errant signal.

There has to be a reason why Mazda went with a feedback signal system.

You would think that the OMP system is important enough to have this feedback system functional.
It does throw a nasty error (which goes into limp-home mode) when triggered.


-Ted

From my understanding, that's EXACTELY why the DBW systems have the safety of a redundant TPS in there... to prohibit thing like that from happening.

Also, from my understanding the OMP on the Renni doesn't have a feedback, while the S5+ units do, again, for that reason of it being rather important. Not quite sure why Mazda changed it for the Renni, but I'm sure they have some type of safety involved with it... I agree with ya, it would be foolish not to,

[j9fd3s]

Originally Posted by TitaniumTT

From my understanding, that's EXACTELY why the DBW systems have the safety of a redundant TPS in there... to prohibit thing like that from happening.

Also, from my understanding the OMP on the Renni doesn't have a feedback, while the S5+ units do, again, for that reason of it being rather important. Not quite sure why Mazda changed it for the Renni, but I'm sure they have some type of safety involved with it... I agree with ya, it would be foolish not to,

the Rx8 MOP is explained in the service highlights book. off the top every couple of engine starts the ecu puts the pump thru its range, so it isn't checked in real time like the 89-2003 pumps.

we set my haltech to run the mop (it was a 20B), the haltech can RUN a stepper motor, but the position sensor is a problem, because its monitored somewhere else, and you can't do anything EXCEPT log it. so if the MOP took a crap, there is no limp home, no CEL....