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Hooked an oscilloscope up to an AAZ pump
by
regcheeseman
on 05 Aug, 2011 14:34
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My friend offered me his AAZ that he is selling, I declined but asked if I could hook it up to my scope.
First up I checked the injection sensor - which is a simple NO pressure switch fed with 5v, I knew what I would see here and it was purely to test my scope which has sat on the shelf for 12 months filling with grinder dust and paint mist
Now onto the main item I wanted to test - the advance jobby whatsit in the base of the pump - Unfortunately the results were inconclusive, there was a very small signal present at idle but there was no change in magnitude or frequency with any increase in revs.
Either his is faulty or it does nothing at normal operating temps
Anyone shed any light?
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#1
by
Mark(The Miser)UK
on 05 Aug, 2011 14:48
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Maybe I'm thinkig of the wrong thing, but isn't that a solenoid rather than a generator?
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#2
by
R.O.R-2.0
on 05 Aug, 2011 15:12
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Maybe I'm thinkig of the wrong thing, but isn't that a solenoid rather than a generator?
thats what i thought too..
isnt that a timing retard solenoid? something keeps the pump from advancing a bunch, just to keep the exhaust clean?
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#3
by
keaton
on 05 Aug, 2011 15:26
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ok i'm confused.... isnt the AAZ IP mechanical without a computer....
so what did you measure, pics? pins?
are you just trying to measure the noise?
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#4
by
vanagonturbo
on 05 Aug, 2011 17:29
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Its a solenoid that is operated by a relay to retard timing to cut down on NOX. There is no duty cycle to it.
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#5
by
regcheeseman
on 06 Aug, 2011 12:09
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Its a solenoid that is operated by a relay to retard timing to cut down on NOX
Funny you say that as other people on here swear it's PWM controlled
and I wanted to prove that they were spouting rubbish.
ok i'm confused.... isnt the AAZ IP mechanical without a computer....
No - later ones got more and more eletrical gubbins attached. Pretty much all UK ones seem to have the injection pressure switch and the timing solenoid in the base of the pump.
Maybe I'm thinkig of the wrong thing, but isn't that a solenoid
No it is a solenoid, I'm tapping the scope into it's wires to monitor it's control signals - however during the time I got to monitor this one - I saw nothing of any interest.
isnt that a timing retard solenoid? something keeps the pump from advancing a bunch, just to keep the exhaust clean?
Is that what it does??? Cars always seem to run better with it unplugged, quicker to rev.
I've still got the one in my pump so I may just connect it up...
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#6
by
Mark(The Miser)UK
on 06 Aug, 2011 15:23
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Its a solenoid that is operated by a relay to retard timing to cut down on NOX
Funny you say that as other people on here swear it's PWM controlled and I wanted to prove that they were spouting rubbish.
ok i'm confused.... isnt the AAZ IP mechanical without a computer....
No - later ones got more and more eletrical gubbins attached. Pretty much all UK ones seem to have the injection pressure switch and the timing solenoid in the base of the pump.
Maybe I'm thinkig of the wrong thing, but isn't that a solenoid
No it is a solenoid, I'm tapping the scope into it's wires to monitor it's control signals - however during the time I got to monitor this one - I saw nothing of any interest.
isnt that a timing retard solenoid? something keeps the pump from advancing a bunch, just to keep the exhaust clean?
Is that what it does??? Cars always seem to run better with it unplugged, quicker to rev.
I've still got the one in my pump so I may just connect it up...
So to clear up the mud, this is the thing on the side with an electrical terminal on that faces towards the fuel lines. Out of it's top is a hard line that goes back to the internal vane pump regulator. It loks like a second hard line could be fitted. Am I correct? 
One of the exploded pump explanations on the internet has one dismantled if this is the item.
It opens up to reduce the advance by the look of it.
I suspect its powered up as you decelerate. I don't think its proportional. More like a yes or no.
Is yours connected to anything? I've never seen one connected. Might be a 'Euro' thing
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#7
by
regcheeseman
on 06 Aug, 2011 16:00
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So to clear up the mud, this is the thing on the side with an electrical terminal on that faces towards the fuel lines. Out of it's top is a hard line that goes back to the internal vane pump regulator. It looks like a second hard line could be fitted. Am I correct?
Nope - not that one!
See the advance spring cover?
Down near that, towards the head, conveniently obscured by the damper in my picture is a white plastic covered device with two wires (black and brown) no hard lines anywhere.
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#8
by
Mark(The Miser)UK
on 07 Aug, 2011 09:06
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Reg,
Don't you have a pic that tilts the pump enough to see the wires, as so far my searchs only show the adaptor that fits on in place of that cover?
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#9
by
vanagonturbo
on 07 Aug, 2011 15:11
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So to clear up the mud, this is the thing on the side with an electrical terminal on that faces towards the fuel lines. Out of it's top is a hard line that goes back to the internal vane pump regulator. It looks like a second hard line could be fitted. Am I correct?
Nope - not that one!
See the advance spring cover?
Down near that, towards the head, conveniently obscured by the damper in my picture is a white plastic covered device with two wires (black and brown) no hard lines anywhere.
I was thinking of the same part also. If what you are referring to is in this pic, I have no idea. never seen a wiring harness coming from the cylinder head side of the timing spring cover. Granted, I am in Amerifail, so we dont really see much of that other stuff
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#10
by
Mark(The Miser)UK
on 07 Aug, 2011 16:19
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Come on someone with Paintshop Pro could rub that damper out
Reg, are you some kind of Politician? How can you post a pic of everything but the part you are talking about? 
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#11
by
burn_your_money
on 07 Aug, 2011 16:31
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Obviously it's a TDI pump but it's the same solenoid. At least it looks the same, I don't know if it is the same PN
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#12
by
regcheeseman
on 07 Aug, 2011 16:44
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That's the one! Mounted at a different angle but that's it.
Don't you have a pic that tilts the pump enough to see the wires,
I have, but where's the challenge if you actually know what I am talking about. I'm surprised that given your location you've not encountered it before, I've one on all the AAZ pumps I've seen.
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#13
by
Mark(The Miser)UK
on 07 Aug, 2011 18:12
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#14
by
vanagonturbo
on 07 Aug, 2011 21:54
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I am so confused. First pic is an IDI pump and second pic is a TDI pump. AAZs are not TDIs. What am I missing?