This is my question… I have a Dakota digital's brain box that is converting my VSS from the transmission to run an aftermarket speedometer. I originally had the VSS removed from my chip for the 1227730 ECU and now I programmed it back hoping to get the highway mode… I am curious if I leave the Dakota digital box hooked up and running my speedometer and run the signal wire from the Dakota digital to the ECU (constant 4000 pulse) would that work? I am thinking that the highway mode might need a variable pulse until it gets up to say 4000 pulse to engage the highway mode, or will my setup work?
Any thoughts????

I don't know how it's working now with no VSS input to the ECM. Lots of things depend on it. You say you programmed it out?? I would run the 4007 pulse to the ECM the way it is supposed to be and take the 2000 pulse output from the ECM to the Digital box which I'm sure you can calibrate to accept 2000 ppm.

Well I have removed many control items that are not on the engine... such as emissions, EGR, etc... are all gone.
I hope that you can all see the diagram of what I have created and is the current way it is wired up...

That sure looks like it should work, using the 4000ppm ac output directly to ECM. I don't see a problem with that. Make sure programming in Prom is set for 4007 and it should work well. Emissions delete is common.

yes I am DBOYDR... just sent you an email through ebay

looking at the manual for the SGI the way you have it should work. do you have the switch set to ON for 4000? BB9 and BB10 is correct. How do you know it is not working? logging? Also we are talking pulse per mile. you said above "constant 4000 pulse" doesn't work that way. when you are standing still, there is no pulse. over the course of one mile, it should add up to 4000 pulses.

Thought so.

depending on speed it will blink faster or slower.

Cannot argue with that.

hmmm... when I start to move it blinks consistently. at 15mph or 70mph it blinks at the same rate.

Here is the part of the Dakota manual I think applies:

APPLICATION #5
Convert a 16000ppm signal from a Hall Effect VDO signal generator to
8000ppm, 4000ppm, or 2000ppm to run a cruise control or fuel injection
computer.
The Hall Effect sensor will have three wires. The white wire is the signal.
The signal wire will be tapped into so the SGI-5 can read it. The sensor signal
wire will go to the SPD IN terminal. Connect the PWR terminal to a 12-volt
accessory wire and connect the GND terminal to a good ground location. The
output connections will depend on your particular application. Here are some
typical examples:
OUT1, 8000ppm AC: most aftermarket cruise controls
OUT3, 4000ppm AC: most TPI computers and some OEM cruise controls
OUT4, 4000ppm oc: use this if OUT3 does not provide a good signal
OUT5, 2000ppm oc: most TBI computers and some OEM cruise controls
Set the switches as follows.
1 2 3 4 5 6 7 8 9 10
OFF ON OFF OFF OFF OFF OFF OFF OFF OFF

my understanding is that it blinks when it receives a signal so would think it would blink faster as you went faster because the mile is coming up quicker. I may be wrong. the point is, the speedometer works accurately so I wouldn't worry about that. Or did you need to calibrate the speedo output to make up for an inaccurate vss signal? as long as the switches are set properly and the output switch is on the it should work. Book does say to move to output 4 if signal isn't strong enough but it should be.

I will double check my 1-10 on/off switches... But keep me in mind coming up, i am going to purchase a chip from you. The speedometer works... The speedometer also has a automatic setting that I can drive a known single mile distance and it will calculate the need ppm to keep my mileage reading correctly. I added the dakota digital box to provide the 4000 ppm signal to the ECM.
But I think that if I keep the speedometer and the dakota digital box with a new know programmed chip with 4000ppm programmed I will have a ease of mind knowing it will have the right program settings and highway mode in there....

Will do!

I just noticed that your drawing had 2 pages. On the second page, What is going on there? are you showing the 5 volt reference pins for some reason? It says to SGI 4000? and also shows no high wire?

And also, where are you getting 12v from, I don't think from MAT or TPS is a good idea.

I was going to pull the power from the TPS or MAP sensor for the SGI unit, but also thought it was not a good idea... so I tied into the 12V wire to the cigaret lighter to power it up. Not sure what you mean that "shows no high wire"?

I'm sure it is just a omission, but on the second drawing there is no wire for the VSS high input shown.

there is... it is yellow, kind of hard to see. but I have the VSS high coming from the SGI unit as 4000 ppm output to the ECM at BB10.

I see it now. So, hows it going?

you know I have no problems with it running... it has allot of power! The speedo works. I do have a hickup once in a while where it runs for 5-7 miles and then acts like it is vapor locked... after I get it going again in 5-10 minutes she runs like a champ all day long. I am just not sure if I am getting that highway mode, want the millage, or more important know my chip is sound. I am going to purchase that Chip Tuseday next week, so keep your eyes open for my purchase. and I will fill out all the information you have for the build of it.

Will do!

Utilityguy2:
Well I got the new chip from you and put it in. Runs fine, but the check engine light came on... I used my scan tool and it has VSS error code. I was looking back on how i wired my Hall Effect speed sensor, speedo, and the SGI Dakota Digital convertor together and i think i may have wired the it wrong. i attached the old wiring diagram and the new "VSS_New" diagram for you to take look at. I think that I may have plugged the BB9 terminal into the ground and should have supplied it with a 2000PPM out of the SGI unit. Also should I ground the SGI unit the body and ground the Hall Effect sensor to the SGI unit. You think this is my problem????

Hi,

OK, you say you have a hall effect 3 wire optical VSS. It runs to the SGI 5. your speedo works fine as wired. your ECM does not. You say you now have the 4000 ppm output hooked to B10 and 2000 ppm to B9. that is wrong. 2000 does not go to ECM anywhere. B9 and B10 are inputs for 4000ppm AC. so everytime the VSS pulses high it goes to B10 and when low goes to B9. alternating current is half time high and half time low. So just using one or other is not going to work. Low is not same as ground. it pulses positive-negative. Unless somehow the SGI 5 is wired that way. Sensor ground may be low but only trial will tell. I would wire it 4000 ppm output to b10 and b9 to sensor ground. make sure switches are on on off off but I'm sure they are or speedo would not work. If all of this doesn't work, call Dakota Digital at 605 332-6513 as I'm sure they go thru this every day. If speedo works grounds are ok.

Garry

Thanks. I will double check everything again and wire it up to B9 to the sensor ground.
One stupid question, the sensor ground on the SGI port is going to have a wire to B9 on the ECM and the black ground wire off the Hall Effect sensor spliced together and put in the SGI units sensor ground, right?

VSS.pdf

I don't know if you have seen the attached but just put your SGI-5 in place of the VSS in it and see if that is the way you have it.

The black ground wire from the VSS sensor should go to chassis negative ground according to the manual. I don't know if that makes a difference because I don't know if SGI-5 sensor ground is the same as chassis ground.

Try putting only the B9 wire to SGI-5 sensor ground only and sensor black to chassis ground.

Do you have any way to read VSS output. That would help immensely.

i checked it out and i had the switches as off off off off. Application #2 http://www.dakotadigital.com/pdf/sgi-5c.pdf . you said to use application #5 for a Hall Effect sensor, not sure if that might be my problem? If I switch it to On On Off Off application #5 what output would i run to my speedometer from the SGI or would it matter since the speedo is a VDO unit and can auto process to speed and distance?
The speedometer is looking for a 16000 pulse from the Hall Effect Sensor, but if i take the signal wire from the Hall and ran it to the SGI unit as the input in wire.... i am not sure what to run from the SGI to the Speedo now, none of the out puts are 16000. only 8k, 4k, 4k, and 2k

You said you had a hall effect speed sensor so you need to use app 5 for that purpose. why would you use app 2? It's not for hall effect and not for 16k pulse? App 5 is for a 16k pulse hall effect speed sensor. If you read that part of the manual, it tells you to tap into the white wire going to the speedometer. That tapped wire then goes to signal in terminal on the sgi-5. set the switches and should work. Pretty straight forward. If you can't figure it out why don't you call Dakota Digital for help. that's what they do.