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I need a pinout for the ECU of a 1997 2.8 jetta
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VR6 vanagon
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PostPosted: Wed Oct 29, 2008 9:02 am    Post subject: I need a pinout for the ECU of a 1997 2.8 jetta Reply with quote

I have just gotten a tachometer for my vanagon with an MK3 from a 97 Jetta, just trying to figure out what pin is for the tach, does anyone know?
Thank you and have a great day! ?:
OR can I just attatch it to the coil? If so, what color should the wire be?


Last edited by VR6 vanagon on Wed Oct 29, 2008 3:04 pm; edited 2 times in total
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klucz
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PostPosted: Wed Oct 29, 2008 9:43 am    Post subject: Reply with quote

http://www.vwvortex.com/index.html
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VR6 vanagon
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PostPosted: Wed Oct 29, 2008 10:13 am    Post subject: Reply with quote

I have looked on vwvortex and I am just not finding the info I need, any other help would be GREATLY appreciated.
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Vanagon Nut
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PostPosted: Wed Oct 29, 2008 10:24 am    Post subject: Re: what pin on a 1997 MK3 ecu is for the tachometer? Reply with quote

VR6 vanagon wrote:
I have just gotten a tachometer for my vanagon with an MK3 from a 97 Jetta, just trying to figure out what pin is for the tach, does anyone know?
Thank you and have a great day! Question


My Jetta install is an OBD1 ABA.

The tach from my '94 Jetta cluster (removed) worked with signal from 22/68 from the ECU or 1 from the coil. (got that info from the Vortex. Hint hint Wink ) With either wire, it was a little "jumpy" at idle (like vibrated a *little*).

I'm not sure if tach needs to be used in conjunction with the Jetta cluster.

Please post if you get the same results or an improvement using the tach with the Mk3 cluster.

A quick look at Bentley and things look much different for OBD2. I don't see a 1 in the fuse/relay box portion of diagram. Have a look. If you find 1, trace it back to the ECU. This may give you the wire.

But.....

1 from the coil might work too. For my Vanagon hi/low pressure oil warning unit I installed, I needed to connect to 1 of the coil. Pics below of added wire to Jetta coil. If you add a wire, use a spade type connector. I used a ring. It's possible your coil has the leads shown in the pics soldered in place. Don't know how you'd deal with that.

On my Jetta tach, there are 4 pins. IIRC, 15 is on one end of the row of 3 pins, - is middle and 1 is the other end. The top 4th pin may be for illumination.

Neil.

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VR6 vanagon
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PostPosted: Wed Oct 29, 2008 10:34 am    Post subject: Reply with quote

My engine is an OBD II, It is a 2.8 liter from a 1997 jetta. I have all the wires on the harness, just wanting to know what one is for the tach. I have been searching samba and vwvortex, but am finding nothing in the way of a diagram, or a wire color for my specific engine.
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Vanagon Nut
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PostPosted: Wed Oct 29, 2008 10:39 am    Post subject: Reply with quote

Got Bentley?
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1988 West DIY 50º ABA

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VR6 vanagon
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PostPosted: Wed Oct 29, 2008 10:47 am    Post subject: Reply with quote

No, I don't have a bentley guide. Was hoping I wouldn't need it to just hook up a tach, was also told that it might not even have the pin info I need in it.
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Vanagon Nut
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PostPosted: Wed Oct 29, 2008 11:24 am    Post subject: Reply with quote

IMHO, totally worthwhile getting.

And my bad. Shoulda known from your sig what engine you had!

The 2.8 VR6 ignition coil setup is quite different. From Bentley: ".... three double ended coils within one housing".

Check your Pmail.

Neil.
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1988 West DIY 50º ABA

VE7TBN
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VR6 vanagon
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PostPosted: Wed Oct 29, 2008 11:28 am    Post subject: Reply with quote

Sooooo, is it possible to connect the tach through the coil instead of the ECU??
there is only 1 connector on my coil, does anyone know what color the wire should be where I connect in?
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VR6 vanagon
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PostPosted: Thu Oct 30, 2008 6:59 am    Post subject: Reply with quote

bump
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syncro vr6
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PostPosted: Fri Oct 31, 2008 4:58 pm    Post subject: Reply with quote

I think it has to come from the ecu. I ended up buying a 6 to 4 cyl tach converter to use the stock one.
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