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Kiwi_Roy
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PostSubject: Stepper Motor Test   Sun Feb 11, 2018 8:16 pm

I have the tank of at the moment so I thought I would check out the stepper motor.
There are 4 pins on the plug, the 2 outside ones attach to one coil of about 50 Ohms, the inner 2 attach to the other coil of 50 Ohms.
On mine the inner pair were open, so it wouldn't be working, perhaps that explains the fast idle?

I don't think these motors are designed to come apart, I'm fairly certain the motor is glued into the aluminium housing.
With nothing to loose mine was coming apart. The end came off and I was able to get the internal parts out leaving the valve behind.
I found the coil wire was broken right at the solder point but it was too short to re-attach so I pulled the motor apart and re-wound the coil.
I don't like my chances of getting it back together, I will have to motor it to wind the screw back in, It may motor if I just turn the bike on but which way?
It needs to move as though opening the valve, anyone know?

Meanwhile I will see if I can source one.

Looking at the motor/valve construction I really can't see what would be better than a simple flush with carb cleaner, the motor seemed to be well greased, it has a small ball race to take up the thrust, squirting cleaner in any of the 3 ports should be all you need to do, it won't get into the motor.

When I get the new valve I will section this one for your entertainment.


Last edited by Kiwi_Roy on Sun Feb 11, 2018 8:35 pm; edited 1 time in total
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Oz1200Guzzi
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PostSubject: Re: Stepper Motor Test   Sun Feb 11, 2018 8:34 pm

Roy,

Being a stepper motor, the probability is that first one coil fires,then the next, repeat. This will make it go in one direction. reversing the sequence will make it go back the other way. You could try 90 or 180 degrees apart to see what happens ( I am thinking 90 degrees). If it doesn't work again, it can be put down to the university of life (I studied there too - might have been asleep during some of the lessons though). The direction maybe critical on the phasing.

From a circuit diagram, A and D are the outside connector pair, with B and C the inner pair, as you say. Without looking at a good one operating with an oscilloscope, it's very hard to tell.

If you need more info on how to do this, let me know and I will try and explain it - do you come from an electrical/electronic background? However, simply firing one coil, then the next fairly quickly, you should be able to determine which way is which, at least to test it. As this does not do a full rotation, it's anyone's guess as to the number of steps needed to go from fully open to fully closed (or visa versa). In normal operation, the stepper would get to its position that the ECU is happy with, and stay there until more command pulses tell it to do something different.
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Kiwi_Roy
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PostSubject: Re: Stepper Motor Test   Sun Feb 11, 2018 8:40 pm

Thanks for the Info, yes I'm a little familiar with how they work but I was thinking I wouldn't be able to switch coils fast enough, any suggestion would be welcome.

Do they reverse the polarity of the coils or simply pulse one then the other, I could do that with a relay and 555 timer?
If I have to change polarity that gets trickier.
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Phang
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PostSubject: Re: Stepper Motor Test   Sun Feb 11, 2018 10:12 pm

this is an i interesting topic, subscribed!
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pauldaytona
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PostSubject: Re: Stepper Motor Test   Sun Feb 11, 2018 10:40 pm

And we need pictures!
For my ecu test bench I got a stepper from a junkyard. Came out of a fiat, and made by marelli, it might be the same as the one in Guzzi's
It looks Ducati uses the same ones as Guzzi:
[You must be registered and logged in to see this link.]

I have one like this

[You must be registered and logged in to see this link.]
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Kiwi_Roy
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PostSubject: Re: Stepper Motor Test   Mon Feb 12, 2018 5:12 am

The markings on the GRiSO unit are Magneti  Mareli on the casting 1B06/00  S0066 on the electrical part.
The Guzzzi part No GU 05135830 has been superceeded
new part No  896540
I believe this is common to a whole range of models, GRiSO 1100, 1200, Breva Norge etc.
They are very spendy so look after it!

The other one you have is only part of a valve.


Last edited by Kiwi_Roy on Wed Feb 14, 2018 5:02 pm; edited 3 times in total
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pauldaytona
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PostSubject: Re: Stepper Motor Test   Mon Feb 12, 2018 2:16 pm

1B06/00 is the part number, the s number must be a week/batch number, not important.

If you can get the part out and in then you can use a ducati part, it could be used in more bikes.
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Oz1200Guzzi
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PostSubject: Re: Stepper Motor Test   Mon Feb 12, 2018 2:25 pm

Roy, you could use the 555 to create a pulsed square wave (probably around 25% duty cycle), then a D type flip flop (or even two) with some driver transistors behind to drive the coils.

Drive one from the rising edge, the other from the falling edge of your 555 output.

I would go for something in Hertz range (maximum of 10, but clutching desperately at straws here?). Simply reversing the outputs to the coils "should" reverse direction...

Capice?
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BrianD
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PostSubject: Re: Stepper Motor Test   Sun Feb 25, 2018 7:45 am

maybe a bit late but Guzzidiag has a stepper motor test (not used it yet though)
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XU12
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PostSubject: Re: Stepper Motor Test   Thu Mar 01, 2018 10:28 am

only one Question: What will happen without this Steppermotor system? The idle may be controlled by a different mapping?
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Pete Roper
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PostSubject: Re: Stepper Motor Test   Thu Mar 01, 2018 10:38 am

It's main purpose seems to be to control idle speed during warm up but I'd assume it also has an effect at altitude, (Though that may be controlled entirely through the air pressure correction table.). Thing is some of those who have high idle problems fix it by puting a tap in the stepper feed and once warm the stepper can be blocked off to negate it's input to running.

Pete
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pauldaytona
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PostSubject: Re: Stepper Motor Test   Thu Mar 01, 2018 1:05 pm

The older bikes without stepper do have an idle air bypass, the stepper acts as bypass regulation.
Around idle. You can see if it is opened in guzzidiag. The test there works with a running engine, it should change idle revs when test is used.
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paulbrice
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PostSubject: Re: Stepper Motor Test   Fri Mar 02, 2018 2:48 am

I fitted a bypass valve but it doesn't work for me (1200 8V). At any point (cold or hot) as I shut the by-pass; the engine progressively gets upset & stalls when it's fully closed (yes, I set the idle balance single screw with the stepper in play). I haven't run the experiment setting the idle balance with the by-pass shut & then opening it though...
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paulbrice
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PostSubject: Re: Stepper Motor Test   Fri Mar 02, 2018 2:49 am

Should add (to my signature as well) I'm running Mark's map so lambda off
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BrianD
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PostSubject: Re: Stepper Motor Test   Sat Mar 03, 2018 8:40 am

I belive that the stepper motor is there for warm up mainly and adjusts idle to suit
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tris1948
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PostSubject: Re: Stepper Motor Test   Mon May 07, 2018 6:18 am

Roy

Lay your hands on one of these [You must be registered and logged in to see this link.]

I wanted to bench test my stepper. Thus with one of these, a Ducati plug and a USB power supply I stroked the stepper in and out at a range of speeds and cleaned it within an inch of its life.

Bugger still doesn't work properly and I'm loathed to shell out £500 for a replacement at the moment so am likely to go the bypass route

However. I have a theory that all these steppers are essentially the same differing only in how they mount and the pintle on the end.

SO I think if you have managed to pull all the guts out of the body you might be able to switch the pintle plus is screw bit to one of these [You must be registered and logged in to see this link.] and press the whole kit and caboodle back together for about £30

the only reason I haven't tried it yet is be cause I don't have a spare, and a dodgy ICV is better than no ICV!!

Tris
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pauldaytona
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PostSubject: Re: Stepper Motor Test   Sun May 13, 2018 10:03 am

I once tried what happens on a 1200 sport with the stepper disconnected. Well it's not getting batter that way, with irregular idle. Just be brave and try to change the thing, make pictures for us and tell if it worked.
I do this sort of things to educate you all, so now your turn.
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