ABA OBD1 ECU plug pin 46

[Vanagon Nut]

Hi folks.

I know there's at least one other person who will be tackling their wiring harness soon so.....

This seems pretty obvious, but beware that "46" on back and front of ECU plug can look an awful lot like "48" which it is not.

Not every person will choose to repair their harness wires by replacing sections of it but if you are, you'll likely be in there visually confirming wires.

So holding ECU plug with pins facing you:

1 ------- 23
24 ------ 45
46 ------ 68




Neil.

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1981 Westy DIY 15º ABA

1988 West DIY 50º ABA

VE7TBN

[h00drat]

I feel like this post was created for me...so while I don't exactly know what it means yet, I wills ave it for later
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<<Tyler>>
1987.5 Wolfsburg Weekender / CHC / 2.0 ABA
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[Vanagon Nut]

[Vanagon Nut]

A couple tips on harness work if one needs to replace any corroded wires.

Though untested as yet, my swap will not use the large round connectors between engine and ECU harnesses. If you do same, keep that part! Some wires/terminals from this connector will fit the ECU connector. And, they have the silicone seal at terminal.

Some wires to my ECU connector were corroded. Though tedious to do, they can be removed using narrow gauge bailing wire. A paper clip might work better for this. I found that the ends had to be sanded a bit so the wire would fit. It may help to slightly bend tip of each wire inward toward where it will contact each locking tab on terminal.

If you're repairing/replacing corroded wires and run out of "sealed" wires, you can cut the silicone seal from a corroded sealed wire then slip that seal onto a non sealed lead then seat the seal into connector by hand.

Neil.

_________________
1981 Westy DIY 15º ABA

1988 West DIY 50º ABA

VE7TBN

[82westyrabbit]

Thanks your information was two weeks too late. I had to figure it out on my own.

I bought two wire connecters with the right pins in them. I cut one of the connecters apart to harvest the pigtails to fix the wires that were broken in my harness when I bought the used Tiico engine. Then I soldered and heat shrunk them into the harness. Your Information is helpful as always. Thanks

[Vanagon Nut]

heh heh. Oh well. Do you plan to interface engine harness directly to ECU [edit: ECU harness] without a connector?

The one real risk with what I did, which is kind of obvious, is that even though i inspected, cut back, inspected each used wire, there could be corrosion at the other end, I guess. I didn't see any obvious corrosion at the terminal end though.

Nice work. I know that new leads can be purchased but they can be pricey locally IIRC and I didn't want to wait around for them.

If I were to add anything to this, if one has access to a used harness, buy it.

Neil.
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1981 Westy DIY 15º ABA

1988 West DIY 50º ABA

VE7TBN

[82westyrabbit]

I have not yet decided. Power B+ is going to the glow plug fuse. Power key on is a separate connection. Ground goes to the cylinder head. My oil pressure - water temperature and tac from the diesel harness just plug into the engine so I am not sure there any point. All done by the way. The only point in the connector is if I decided to in stall a low coolant light and or the oil buzzer. I will Install a oil pressure gauge. Thanks

[Vanagon Nut]

Ok. Thanks. Don't know if Tiico uses this part but on the Jetta/Golf Mk3 theres a large 27 or 28 pin connector interfacing engine harness to ECU harness.
_________________
1981 Westy DIY 15º ABA

1988 West DIY 50º ABA

VE7TBN

[82westyrabbit]

No. On the Tiico engine the wiring harness is all one harness with only about nine wires that get wired to the van. I think there’s a picture of it on my build thread.

[Vanagon Nut]