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Old 05-09-2009, 07:05 PM   #11 (permalink)
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MayBe somebody here on EcoModder can decipher this



Is that a Bus next to F25? Should all 3 terminals have the signal?

I do not see Brown and Red on any of the noted terminals . . . . . .

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Old 05-10-2009, 10:18 AM   #12 (permalink)
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That's weird you don't have it. I just went outside to have a look at my fuel pump harness and there is was, brown and red, right where it should be on pin #6.
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Old 05-10-2009, 11:15 AM   #13 (permalink)
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I'm not sure the fuel adjustment signal is it. If you (or anyone) have access to a Bently manual handy then poke around for a "fuel consumption" signal I suppose.
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Old 05-10-2009, 11:47 AM   #14 (permalink)
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Dremd's pic is from the Bentley. I just searched through my copy for "fuel consumption" and it's not in there.

The quantity adjuster is what sets the fueling, and the modulating piston displacement sensor is the feed back loop. So you need to take your signal from pin 2.

Quote:
Quantity adjuster N146
The quantity adjuster is integrated in the distributor injection pump. The task of the quantity adjuster is to generate the correct injection quantity from the control signals.

The quantity adjuster is a solenoid, a type of electric motor which adjusts the position of the modulating piston via an eccentric shaft and thus regulates the fuel quantity continuously from zero to max. delivery rate.

Modulating piston movement sender G149
Supplies the control unit with information on the momentary position of the quantity adjuster in the injection pump. The injected fuel quantity is calculated from this information. Sender G149 is a non-contact sensor for measuring the angle of rotation. It is attached to the eccentric shaft of the quantity adjuster.

An alternating magnetic field is produced in a specially shaped iron core by AC voltage. A metal ring attached to the eccentric shaft moves along the iron core and influences this magnetic field. The change in the magnetic field is evaluated electronically in the control unit and indicates the position of the quantity adjuster.
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Old 05-10-2009, 12:49 PM   #15 (permalink)
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B ad news guys; I'm sick as a dog; going to head out wit the ohm meter and find the pin at the ECU that corresponds to the 10 pin connector near the pump.

I actually own 2 bentley manuals; but have already burn up the installations on both. I guess it's time for me to just spend the $50 for a new registration.
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Old 05-10-2009, 03:56 PM   #16 (permalink)
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Fuel pickup wired up and *working*.
I was looking at the wrong connector . . . .

On to the VSS (G22 White and Blue)


About to pull the instrument cluster
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Old 05-10-2009, 03:59 PM   #17 (permalink)
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Dremd-

The fuel consumption signal I used on my TDI goes from the ECM directly to the instrument cluster. Mine is a '96 so it's probably quite a bit different from yours, but FWIW, my fuel consumption signal enters the 28-pin connector on the cluster on pin 26. In the Bentley manual, the description is "Single Connector, multi-function indicator signal."

That said, the VSS signal also goes to the instrument cluster and in my case was found on pin 27 on the cluster connector. Removing the instrument cluster to gain access to these two wires may be a minor hassle, but may be your most convenient access point. Good luck!
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Old 05-10-2009, 04:04 PM   #18 (permalink)
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Hey Yetimus; I didn't see a fuel consumption line going to the instrument cluster on mine.
. . .
If it could be located that would eliminate a lot of work for others.

Here's the 99.5 up Cluster diagram on TDI Club

http://pics.tdiclub.com/data/517/DZS...nt_Cluster.pdf
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Old 05-10-2009, 06:06 PM   #19 (permalink)
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Good News: It's in and it reads. Speed works well, needs a little calibration, but fairly close.

Bad news: I'm thinking that the quantity adjust line must just modify some map in the pump; the mpguino readout hovers around 1/2 GPH regardless load; but does drop to 0 when there is no load. . . .

Maybe I'm missing something . . . . Setup? I just used defaults across the board.


Put in a call to my buddy with the O-Scope so I can probe the Quantity adjust line and see what we get some time next weekend.
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Old 05-10-2009, 07:24 PM   #20 (permalink)
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I would suggest the following setup values for vw/audi(rest at default). Must get through all items to store.

VSS Pulses/Mile=13406
MicroSec/Gallon=0128800000
InjTrg 0-Dn 1-Up=1

FYI, the signal rmccomiskie and yetimus describe sounds like a wire from the ECU that should incroproate all the fuel variables into a basic duty cycle representation of fuel consumption for an onboard mpg gauge, that never gets installed in the states.

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