Re: Fiat ECUscan Free diagnostic software connection problems
It's not just a case of soldering pin 3 to 7
you need to isolate the original engine pin 7
as well.
John
That is correct. I will give a translation here for use with an 8 pin DIP witch (4 swithes). No pictures.
There are many VAG cables out there, and they do differ in layout inside. But they do the same job.
You will need:
- Multimeter with audio function (beep).
- Microswitch with 4 switches.
- An old 40 pin ATA cable. I used an 80 pin cable, but the wires inside are very thin.
- Very small wirecutter.
- Small piece of circuit board, full of holes - cut to shape.
- Soldering iron.
- Stanley knife.
1. Locate pin 7 at the front. These are numbered. Turn on you multimeter to the audio function. Hold one plug to pin 7 (outside), and drag the other plug over the hardwires on the inside of the cable until you hear it beep. You have located pin 7 on the inside - which was not very obvious on my cable.
2. Cut this hardwire at the middle, leaving enough space on both ends for soldering.
3. Locate pin 1, 3 and 9 (if I remember correctly) on the inside.
4. Mount the microswitch to the circuit board and cut the plastic cover of the cable to make a smooth install.
5. Cut 4 wires from the ATA cable and solder them (separately) from pin 1, 3, 7 and 9 and to the "in" side of the microswitch.
6. Cut 4 new pieces from the ATA cable and solder them to the other end of the microswitch. (Where signal goes out when the lever is "on").
7. Remove some insulation on the 4 ends and twist them together. Solder the whole lot back to pin 7 on the cable. Make sure you solder it to the circuit side of pin 7, not pin 7 itself.
8. Put the whole thing together, making sure no wire/metal touches anything it shouldn't.
You now have a fully functional cable with the possibility of selecting 4 different ECUs.
