So first off I’ll assume you have an ODBI/OBD0 ECU with the CN2 de-soldered.
I SUGGEST YOU USE THE NOKIA-DKU 5 CABLE available on EBAY.
Once you have that cable you will need to cut off the cell adapter part on the end. Then you will strip the cable to expose the wires. Strip off about 1 inch.
Once you stripped the shielding you will see the shield conductor (silver wires in a woven pattern shielding the other wires). Twist this shielding to make it into a single wire. There will be some type of aluminum foil surround all the wires now, remove this foil.
Next you will strip the brown wire and solder it to the shielding conductor that you twisted into a single wire. It should look like this.
Then you will strip the orange and red wires. Then drill a hole in the side of the ECU case and feed the wire through.
I used some random wires lying around to solder to the CN2 points. This was because the USB cable wires were too thin and the one was to thick to make a good solder connection.
WARNING, COLORS ARE NOT CONSISTENT, PLEASE SEE THIS PAGE FOR ALL KNOWN COLOR COMBINATION
Then you will
Solder the Ground conductor to #1 pin on CN2
Solder the Receive Signal wire to #2 pin on CN2
Solder the Send Signal to #4 pin on CN2
As you can see I wrapped it around the ECU bar. This was done to help avoid accidentally pulling on the black wire and having to re-solder everything. This way then you pull on the wire it seems to put the pressure on the bar and not the solder point on CN2. Or you can use a zip tie.
Then of course wrap those connections with eletrical tape or use shrink wrap.
Here is the end result.
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