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Old 08-24-2010, 06:47 PM   #11 (permalink)
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NachtRitter I appreciate any help
Thanks all

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Old 08-29-2010, 02:15 PM   #12 (permalink)
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I found what I think is the correct pinout pic .. .:FFS TechNet : OBD1 ECU Pin out Schematics :. .. but after that I'm still lost.
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Old 08-29-2010, 06:56 PM   #13 (permalink)
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MPGuino connections

Hey WD40...

That's a pretty good reference, actually.

Hopefully these pics will help a bit too.

Disclaimer: I prefer reversible mods in general, which applies to electrical mods too. I particularly dislike those "splicing" clips which cut into the electric wires when clamped shut; I've had enough occurrences of those wearing through the wires completely over time that I refuse to use them anymore. And if I don't have to cut and solder, I won't. This approach may not be for you, but that's what I'm showing here.

First, ECU connections. I made the connections I needed for the 'guino directly at the ECU connector.

The ECU is to the right of the passenger footwell (assuming LHD of course). A bit of a bugger to get out so that I could get at the connectors, but it's doable. Service manual pics help:


After getting the connectors off, it's not too tough to figure out which connections you need, based on the images and wire colors given by the reference you linked to above. Each of the three connectors is a distinct size. For example, the VSS signal is included in the "B" connector, which is the smallest of the three. The VSS signal is at pin 10, and should be either yellow with a blue stripe or orange. In my case, it was yellow with a blue stripe (see arrow):


BTW - I had a spare harness, which I used to get these pics rather than dissassembling my footwell again... hope you understand...

You might notice in the pic above that there is an open hinged 'cover' over the ends of the wires... I take advantage of the cover when I 'connect' my wires.

With 22gauge speaker wire, I can strip the ends, bend a little 'nub' into the exposed wire, and then shove it in with the needed connector slot (VSS in this case) (see the white wire in with the yellow with blue stripe wire):


Then I can snap the 'cover' back in place which helps hold my wire in place:


I also used electrical tape to keep the added wire from pulling out any.

I'll leave the Injector Pulse connection as an exercise for the reader. You can use any one of the 4 injector signal wires, which are on connector 'A', pins 1, 2, 3 or 5. You only need one.

Next, constant power. There is a 3-pin Data Link Connector also on the right side of the passenger footwell, just under the glove box. There are two connectors under there; one is the 3-pin connector and the other is a 2-pin Service Check Connector. Service manual image gives you an idea of where it's at (ignore the text about the jumper wire; it's unrelated to this topic. It's the best pic I could find in the service manual that shows where this Data Link Connector is located):


And here's a pic of it in my car:


The connectors are hidden behind the panel normally. The two outside pins of the 3-pin connector are always live; black is ground and blue is +12v. They are protected by a 7.5Amp fuse ( I think it is ) which should be plenty for the 'guino. My connectors are a bit hokey; next time I hit the wrecking yard, I'll see if I can find a standard connector that fits the 3-pin so it looks a bit cleaner.

Let me know if that helps to clear things up or if you still have questions...
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Old 08-30-2010, 12:10 PM   #14 (permalink)
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Awesome .. thanks for the pics and help NachtRitter
I will get on this ASAP
Hows the "aerocaps" doing?
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Old 08-30-2010, 04:47 PM   #15 (permalink)
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Quote:
Originally Posted by WD40 View Post
Awesome .. thanks for the pics and help NachtRitter
I will get on this ASAP
Hows the "aerocaps" doing?
Let us know how it goes...!

I do have updates on the serving tray VX wheel covers that I need to post... will need to get a few more pics and get them uploaded before I update my How-To...
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Old 09-07-2010, 06:03 PM   #16 (permalink)
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Good Info.
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Old 09-10-2010, 12:45 AM   #17 (permalink)
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Its alive .. wow what a difference to see where the mpg are vs a preconceived idea of where they are.
I did a 200 kilometer run that averaged 3.75 L/100 km. thats better then my avg of 4.3.
I drove 60 KpH for about 5 kilometers and achieved 2.17 L/100 km = 108.393817 miles per gallon .. thats nuts .. hope to get an awesome tank avg from now on.
Thanks for all the help.
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Old 09-10-2010, 12:47 AM   #18 (permalink)
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Awesome!! Congratulations!
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Old 12-30-2012, 09:29 PM   #19 (permalink)
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I know this is a lazarus bump but since I have a 93 vx and am having an issue with the guino I thought it best to keep all the info together especially since I used the instructions here.

The issue is that the guino is not turning on when using the data link connector +12v power (light blue wire) per nacht's instruction. In looking at the haynes/mitchell repair manuals it show the blue wire going into d7 on the ecu but I can't find out what happens inside the ecu.

Also according to those manuals, the data link connector center terminal (white/red) goes to the #3 fuse, driver's side fuse box. If I connect to that center terminal the guino turns on and works.

Can I just use that center terminal? Why would the outside terminal not be providing power?

Tia.
Dirm

Last edited by DoesItReallyMatter?; 12-30-2012 at 09:43 PM..
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Old 04-26-2013, 02:02 AM   #20 (permalink)
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NachtRitter can you confirm that positive from your diagram data link connector +12v power (light blue wire) powers up mgpguino

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