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Old 24-03-2007   #1
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Making an OBD to Fiat connector

Ok so i want to make a connector so my OBD, OBD2, EOBD reader will be able to read any fault codes off of my Bravo HGT 2001.

Is this possible?

The idea i have is to get an OBD2 socket out a car at the scrapyard, aka a nice Volvo V70, or Punto mk2 JTD sitting and the wiring running from the back, then hopefully i can splice in a Fiat connector (dont know what this looks like anyone got some pics before i splice in my MAF sensor )

Obviously i dont know what pins send what data, but was hopping someone here could help, so i can connect pin 1 fiat to whichever pin it corresponds to on the OBD socket.

I will take pics and make a nice guide when i get it working. If someone has done this can they either drop me a pm or post back here.

Cheers!
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Old 26-03-2007   #2
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Re: Making an OBD to Fiat connector

you obviously havent seen the millions of threads i've written about using a few bits of wire to get a 3 pin connector on your car working with an obd connector on a reader. its very easy, and free!

you need 4 lengths of wire. use 3 lengths of wire to connect the 3 pin connector to the obd connector. also use 1 length of wire for power to code reader.

on the 16 pin obd2 connector use the following pins
4- chassis ground (connect to ground on 3 pin connector, or any good chassis earth)
5- signal ground (connect to black wire pin on 3 pin connector)
7- k line (connect to white wire pin on 3 pin connector)
16- 12vDC (connect to battery positive terminal)

you need to remember that there are several 3 pin connectors. the main one is on the front of the fuse box cover in the engine bay.

you could very easily wire a obd connector permanently onto your car (only 4 wires), but you'd need to do at least 3 connectors to cover all modules since there are at least 3 connectors on your car and you cant wire them all into one obd connector safely.

personally i think its better to use 4 lengths of wire and the fiat 3 pin connectors.
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Last edited by jug; 26-03-2007 at 11:03.
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Old 26-03-2007   #3
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Re: Making an OBD to Fiat connector

Cool, is there a list somewhere of what each module covers, asuming they're for different things?
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Old 26-03-2007   #4
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Re: Making an OBD to Fiat connector

no list that i'm aware of. there is the main one on the engine bay fuse box (back right), and another at the back left that i think is for abs. there is also an airbag module connector somewhere inside the car iirc. i havent seen any other connectors, yet.
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Old 26-07-2010   #5
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Re: Making an OBD to Fiat connector

Greetings from New York,
I discovered this informative thread concerning the pin connection between an obd2 16-pin and the Fiat 3-pin connector. I hope someone can help me with a related wiring issue: I am trying to diagnose a problem with the controlled damping system on a 1992 Alfa 164s (the one with electronic struts). There is a suspension control system diagnosis connector in the trunk which uses the Fiat 3-pin format. I have the Fiat-Lancia Tester (FLT) and the ADT 101A adaptor that plugs into it. The 101A terminates with a 9-pin RS232 D connector. I'm missing the connector/wires that go between this adaptor and the 3-pin female plug in the trunk. The wire colors of the 3-pin in the truck are black, white/red, light blue/white. Can anyone instruct me how to fabricate a connector, 3-pin to the 9-pin? I assume it would be very similar to Jug's 4-wire scenario for the obd2 to 3-pin, with one free wire being going the the battery (+) terminal. Thanks in advance for your advice. --Steven Immel
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