VP37 TDI Pump Feedback Voltage

BadAss · Mar 19, 2008

I have recently observed that the feedback voltage from the quantityadjuster on the pump goes to maximum 4,500 Volts when looking in VagCom. This happens even that we request 4,900 in the pump tension map.

This clearly limits the highend power. The curve flatens out after 3500 rpm.

I have tested with the topcover off the pump. When ignition is on and I turn the adjuster to max. by hand. VagCom shows in most cases app.4,850 Volts.

Does anyone know why the ECU is not able to turn the adjuster all the way to the requested and mechanically possible limit ?

I allready searched the Software for some limiter. But didn't find anything yet !

Any help or tip is highly appreciated !

Maybe some other proff. Hardcore tuner here (Eg. Hatemi etc.) Has observed this too !

Best Regards
Kim R

vwmikel · Mar 19, 2008

Log your requested and make sure it is at 51mg/stroke (or whatever the top axis value is in the map). If your smoke map or torque limiter are set lower it will attenuate the pump voltage. Setting the pump voltage past 3999 (factor of 1) in the map while requesting 51mg/stroke will get you a "Quantity adjuster control deviation" error.

BadAss · Mar 19, 2008

Hi VWMIKEL

The last car which we are still working on is on the dyno with online
Eprom Simulator OLS300. I have allready made sure that all the maps you mention is completely maxed out to the axis limits. Some axis limits even expanded

I have monitored all maps and they go to the desired values. But only the pump is not able to reach the mechanical possible max value of 4,85 Volts.

I allso have the correct factor for the map decimal values to get them into volts. We allso know of the deviation fault. That limit can allso be raised in the software. Stock a maximum of 627,59mV is allowed before you get this error

I think next step is to fit a oscilloscope to monitor the PWN signal across the adjustermotor in the pump, to see if this is maxed out >3500 Rpm !

Kim R

vwmikel · Mar 19, 2008

I'd tend to think there might be a problem with the quantity adjuster itself if you're sure that everything else has been covered.

mrchill · Mar 19, 2008

which pump number are you running?

BadAss · Mar 19, 2008

vwmikel said:
I'd tend to think there might be a problem with the quantity adjuster itself if you're sure that everything else has been covered.

I'm thinking the same thing. But the test with oscilloscope should reveal that. If PWM goes steady upwards, but the adjuster doesen't move further. I think we found the problem.

Could anyone confirm that voltages above 4,500 Volts has been observed ? Maybe some logfiles !

Rub87 · Mar 19, 2008

Most ecu's I've logged don't read more than 4.5v.. even if pump tension map is at 4v with factor 1..

I think it has to do with the DIAG parameters, the same reason why on most ecu's MAP pressures above 2600mbar aren't showed, even if the map-sensor's linearsation map is put to 3bar sensor specs..

Same goes with IQ on PD ecu's when going over, I think 70 or 75 mg/h..

BadAss · Mar 20, 2008

Rub87 said:
Most ecu's I've logged don't read more than 4.5v.. even if pump tension map is at 4v with factor 1..

I think it has to do with the DIAG parameters, the same reason why on most ecu's MAP pressures above 2600mbar aren't showed, even if the map-sensor's linearsation map is put to 3bar sensor specs..

Same goes with IQ on PD ecu's when going over, I think 70 or 75 mg/h..

These limitations are allso known. But as said before VagcCom can show 4,850 Volts from the pump. If we turn it by hand, with the top cover off

Rub87 · Mar 22, 2008

I've seen in an vp37 asv file, and max voltage was single value limiter was at 4.898v, wth the factor 1.2xxx

I'm veru intezreseted to know how to fix the 2600mbar problem..

mirulu · May 5, 2013

HI,

did anyone figure that out? I'm solving same problem. If the ECU can use higher voltage than 4,56V?

millerlite · May 5, 2013

I am actually having an issue that I believe is related to this as well. If I request more than 40 mg/stroke of fuel past ~4000 rpm my car cuts out like its going into what feels like limp mode and throws a quantity adjuster error, and runs fine 10 seconds later unless its revved past 4000 rpm at full requested fuel quantity again. I have a bad feeling its my quantity adjuster that's the problem. Any suggestions?

mirulu · May 5, 2013

Please, how to raise the value here? to the limit 4,85V. That is the limit of the actuator

image hosting

Winols od Vagedcsuite

Thanks, Milan

mirulu · May 11, 2013

I have seen this video and there is no problem to apply higher voltage than 4,56V

http://www.youtube.com/watch?v=oe_0OIfDoFg

bhodgkiss · May 11, 2013

Mine maxes out at 4.42V in VCDS (3.65v in maps) so I have the same issue..... and I dont believe its another limiter kicking in. Not sure how to raise it?

mirulu · Nov 20, 2013

I have figured out, that If you put down the top cover of the pump head and start ignition, In the channel 19 there will be the right voltage 4,86V, If you just put the cover on the head, don't screw it, start ignition the lower voltage is back. I think there is some magnetic field, some induktance or something like that

I have found the voltage limiter for that in damons and there is 4900mV ... 4013 value without factor.

ArturCosta · Nov 20, 2013

4013 is correct but be carefull removing that limiter.

My pump maxes out at 4.7v in VAG COM after proper hammer mod.

mirulu · Nov 21, 2013

Hammer mod is not related max. possibility voltage. The adjuster is moving in angle of 60 degrees the lower stop is around 0,7V and upper stop is around 4,8V. The trajectory is linear to voltage.
Hammer mod only moves the collar.

Edgaras7777 · Aug 19, 2014

Hello, wher is pump limit? i did in adress 04d98 4013value without factor, butt not work, my ecu is passat 81kw 021CK, wher is problem?

Edgaras7777 · Aug 21, 2014

Anyone?

bhodgkiss · Aug 22, 2014

so increasing 4013 didnt work?

Edgaras7777 · Aug 22, 2014

yea, im did factor 1.221 and did 5000, dont work, what a fu*ck?

madcowintucson · Aug 22, 2014

i checked mine today channel 19 and it says 4.64 volts. i did a graph and it never deviated under any driving conditions. curious if i hammer mod it would change anything. my car doesn't want to rev above 3500 to 4000, but to be fair i have no intercooler and i have a pure mechanically controlled vnt mechanism.

Edgaras7777 · Aug 23, 2014

my 19 chanel show me 4.160v, butt int vcds 001 group is when i drive 4.64v, whats is this ****?

dieseleux · Aug 23, 2014

Open the top of the pump and see if you have some metal part on magnet.
And with ingnition ON an vagcom connected, when you turn the actuator of the pump you see the voltage move in vagcom.

Dieseleux

Edgaras7777 · Aug 23, 2014

When vagcom show me 4.160V actuator dont full movement, for full movement still about 5*

mojogoes · Aug 29, 2014

7777 is the car smoking at all in any of the gears.

Edgaras7777 · Sep 11, 2014

Hello, i have problem, What could have happened? 019 in group shows voltage 0.720 and 3.800? earlier shows 0.720 and 4.160?

Edgaras7777 · Sep 11, 2014

And when i drive, i have trouble 01268 quantity adjuster-control diference,
Sometimes the engine stop,,, when driving switch on the drive, but again starts

mk1-83 · Jul 20, 2015

Have you solve the problem ?
I have same when asking 4400 in map without factor so I pass the 4013 ?
Maybe try lower value say 4000 at 3200 rpm.
Got bigger nozzles now so voltage must go back to almost OEM setting

mk1-83 · Jul 20, 2015

https://youtu.be/oe_0OIfDoFg

See video looks like 5.22 volt is Max pump voltage.
That's is about 4200 in pump voltage map without factor.

VP37 TDI Pump Feedback Voltage

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