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As this question seems to get asked quite often, I thought it was time for an FAQ with a definitive guide of what hardware and software is required for doing DIY ECU diagnostics on the 145/146. The 145/146 uses a 3-pin connector for all diagnostic connection points on the car and NOT a 16-pin OBD connector as found on a lot of other modern cars (including other Alfas). Excellent work as always. Would it be worth mentioning that the phase 1 Engine ECU diagnostic connector is in a different position to the picture shown and is in the passenger footwell?

Alfadiag was added to DownloadKeeper this week and last updated on 03-Aug-2019.New downloads are added to the member section daily and we now have 297,342 downloads for our members, including: TV, Movies, Software, Games, Music and More. It's best if you avoid using common keywords when searching for Alfadiag. ECUFix.com RS232 ISO OBD-II / VAGCOM / AlfaDiag KKL Interface RS232VAGCOM - Professional ISO OBD-II / VAGCOM / AlfaDiag / VOL-FCR KKL RS232 Interface Description: This interface (adapter) is used as an interface and a serial cable to connect an ISO compliant vehicle to a PC for on-board diagnostics (OBD). Such vehicles are VW, Audi, Seat, Skoda, Volvo, Opel, Vauxhall, Alfa, Mercedes, BMW, etc.

On the alloy top (CF1) engine I believe the Engine ECU diagnostics connector is actually in the black box at the back left of the engine bay along with the lambda connector but I don't currently have any pictures. I'm sure there is one on the forum somewhere but I've not managed to find it yet. When I do I will add it to the original post. Right, that's it!

I've had it with my airbag light! I've tried all the software in the world and it does not work, HOWEVER it seems to me that there may be some issues with the cables.

As I understand from FiatECUScan, I need to modify my cable if I want to talk to my Airbag. This is as per here: It even states an example for the that for a TRW ECU I need a modified interface or an adapter cable but then sort-of contradicts itself stating that: PLEASE NOTE: For the old (non-EOBD) vehicles with 3-pin diagnostic connector you need UNMODIFIED interface with 3-pin adapter.

So do I need to modify my cable or not? Furthermore their diagrams are confusing as I'm not gonna get an adapter cable (at £18 for 3.) and swap it everytime I need to connect to the ECU or Airbag or ABS.

I understand that most of the 9 pins on the Serial cable do nothing. We are only using the ground,k-line,l-line, power andsome other cable. SOOO my plan is to make a custom cable using banana plugs. For this I need a diagram of OBD-to 3 pin fiat with the name of the lines. I've searched the net but I cannot find any info!

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No, you don't need to modify any of the interface cables. Just use the 16-pin OBD cable in conjunction with the 16-pin to 3-pin adapter cable and that is it. No need to mess with any pin rewiring in the 16-pin connector. That is only needed for cars that have a full 16-pin socket on the car (i.e. They don't have the 3-pin socket like we do on the 145/146) and where you plug the 16-pin connector directly into the car without the 3-pin to 16-pin adapter. I used FiatECUScan to successfully reset my airbag light a few months ago using the vanilla (unmodified) interface cables shown in the first post of this thread.

Can you not actually get FiatECUScan to initialise communication with your airbag ECU at all, or does it initialise comms but is then just not able to clear the logged fault codes? If it's the first symptom then you either have a bad connection to the airbag ECU (try re-seating the plugs to it) or you have a faulty airbag ECU and will need to get a replacement one. I used FiatECUScan to successfully reset my airbag light a few months ago using the vanilla (unmodified) interface cables shown in the first post of this thread.

Can you not actually get FiatECUScan to initialise communication with your airbag ECU at all, or does it initialise comms but is then just not able to clear the logged fault codes? Vanilla.interesting.do you work in finance GE? I can't talk to the ECU at all, it does not communicate with it.

The only reason the light came on is because when I went to swap in my steering wheel, I was inpatient and did not wait the full 30 minutes. This was almost 2 years ago! Ever since then I tried with all sorts of systems to re-set the airbag to no avail. Uniscan 1.83 was the only thing that managed to connect to the ecu but then complained about 'Low power' to the unit. Do you know if the airbag units are matched?

Also on fiatecuscan it states that my system is a TRW (2F), I suspect 2F stands for two front airbags. However my car only has 1 airbag.i wonder if that is causing the problem! I have tried many times to clean the contacts and re-seat the connector but as I say, it was only a steering wheel swap! Yep, good guess I do work in finance (in the IT sector). Ignoring the Becker airbag system which is only found on the really early cars, there are 2 other systems in use on these cars - the TRW M.Y.97 and the TRW M.Y.99. The latter of the two simply just extends fuctionality to include side airbags. Both systems utilise the same communications protocol and both are supported by FiatECUScan.

If yours doesn't have side airbags then you will have the M.Y.97 system. It sounds like the comms circuitry on yours has died which is preventing you doing any diagnostics. To rule out any issues with your laptop, OS, or interface cables it would be worth trying to connect them to another 145/146 to test them if you have that option available. I can't talk to the ECU at all, it does not communicate with it. Gio, I've just discovered that some of our cars have an obscure airbag ECU fitted called a 'TRW2'. Cars with this airbag ECU only have a steering wheel airbag (i.e. No passenger or side airbags).

The TRW2 airbag ECU apparently can't be connected to, read or cleared with any of the software currently available. The part number of the TRW2 airbag ECU is 60631206 (will be written on the ECU somewhere) so it might be checking if the one you have in your car is actually one of these. If it is then it explains why you're having problems connecting to it using software on your laptop. Cheers GE, I haven't got the car physically in front of me at the moment so I will have to check later ( I would check on EPER but I'm in the middle of a drive partition in ubuntu and it doesn't have IE) On another even more puzzling note.FiatECUscan doesn't want to connect to my engine ECU! I've tried posting a question on their forum but no-one has replied. The funny thing is that I'm using top-of-the-range SocketSerial RS232 PCMCIA cards but everyone seems too be using the USB-to-serial cable, so there is no help available on good old fashioned serial! I have checked my serial port by doing a loopback test whilst connecting pin 2&3 and my port is fine.I'm really puzzled now!

On another even more puzzling note.FiatECUscan doesn't want to connect to my engine ECU! I've tried posting a question on their forum but no-one has replied. The funny thing is that I'm using top-of-the-range SocketSerial RS232 PCMCIA cards but everyone seems too be using the USB-to-serial cable, so there is no help available on good old fashioned serial! I have checked my serial port by doing a loopback test whilst connecting pin 2&3 and my port is fine.I'm really puzzled now!

Have you been able to connect to any ECU with your setup? Maybe there is something odd going on with the SocketSerial PCMCIA card.

I've got both a serial RS232 and a USB cable but generally just use the RS232 one. My old school laptop has a built-in 9-Pin serial port so it's a native serial connection on the laptop motherboard. Could you also check the cable connection? My is as follows: Serial 9-pin OBD Fiat 3 Pin Looking at it with the pin safety tab on the right, (Pin1¤ Pin2¤¦ Pin3¤) 4 7 Pin 3 (K-line?) 1 5 Pin 2 (Middle pin) + Black crocodile clip (not all fiat 3 pin cables have this) 2 4 Pin 2 (Middle pin) + Black crocodile clip (not all fiat 3 pin cables have this) 8 15 Pin 1 (L-line?) 9 16 Red crocodile clip (Should i be worried about passing 12V into my card?).

Could you also check the cable connection? My is as follows: Serial 9-pin OBD Fiat 3 Pin Looking at it with the pin safety tab on the right, (Pin1¤ Pin2¤¦ Pin3¤) 4 7 Pin 3 (K-line?) 1 5 Pin 2 (Middle pin) + Black crocodile clip (not all fiat 3 pin cables have this) 2 4 Pin 2 (Middle pin) + Black crocodile clip (not all fiat 3 pin cables have this) 8 15 Pin 1 (L-line?) 9 16 Red crocodile clip (Should i be worried about passing 12V into my card?) Will do. RE your airbag ECU. Just managed to dig up some more information on the TRW2. If it is a TRW2 then it appears that it may have 3 wires going to the 3-pin diagnostic connector socket (the TRW M.Y.97 and M.Y.99 only have 2 wires going to that connector). If it does then it seems that all you need to do is to connect pin 3 in the diagnostic connector socket to a ground point anywhere on the car and it will reset the airbag light. Give that a go and let us know if it works.

RE your airbag ECU. Just managed to dig up some more information on the TRW2. If it is a TRW2 then it appears that it may have 3 wires going to the 3-pin diagnostic connector socket (the TRW M.Y.97 and M.Y.99 only have 2 wires going to that connector). If it does then it seems that all you need to do is to connect pin 3 in the diagnostic connector socket to a ground point anywhere on the car and it will reset the airbag light. Give that a go and let us know if it works I assume that's with the power on? Pin 3 is the pin which is 'on its own'.i.e separated by a little tab as per my diagram. I assume that's with the power on?

Pin 3 is the pin which is 'on its own'.i.e separated by a little tab as per my diagram Yes, you need the ignition switched on to the first click ('MAR') positition. I'm not sure which pin on the diagnostics connector is number 3. There is probably a '1' moulded into the plug next to pin number 1 which would make the pin at the other end number 3 but without having a plug in front of me I couldn't say for sure. See the following attachment for the full TRW2 airbag diagnosis / reset procedure and wiring diagram (click pictures for a full size view). attachment=11483:TRW2Airb.iagnosis.jpg attachment=11485:TRW2Airb.gDiagram.jpg. People who use the diagnostics with USB connection, do you have any problems?

Btw what to do with the red and black clamp with one of the cables? When using the USB cables you can get more frequent connection drop-outs than you do with RS232. This is why I use the RS232 interface whenever possible (i.e. On laptops which have a 9-pin serial port). The red fly-lead clips to the positive terminal of the battery and the black fly-lead clips to the negative terminal of tha battery although you don't actually need to use the black fly-lead because one of the 3 pins in the ECU diagnostics connector is a negative connection (there is no positive connection in the diag connector so you always need to use the red fly-lead). When using the USB cables you can get more frequent connection drop-outs than you do with RS232. This is why I use the RS232 interface whenever possible (i.e.

On laptops which have a 9-pin serial port). The red fly-lead clips to the positive terminal of the battery and the black fly-lead clips to the negative terminal of tha battery although you don't actually need to use the black fly-lead because one of the 3 pins in the ECU diagnostics connector is a negative connection (there is no positive connection in the diag connector so you always need to use the red fly-lead).

Thank you very much. I thought that the clamps were used for powering. Thnx for the tip With USB you can normaly diagnose the car/air bag/etc, you just don't get real time measures of eg.

Engine speed? Looking at that second diagram it looks like the K-line is connected to pin 4 of the ECU which means on my diagram is PIN3. Given that the manual states the need to short out pin 3, I highly doubt this would be referring to the K-line. In all probability then the fiat 3 pin is connector is: Male plug: L-Line -G- K-Line ( Pin3¤ Pin2¤¦ Pin1¤ ) OR (Pin1¤¦Pin2¤ Pin3¤) The important thing here is to have a look at the safety plastic separator tag (more compelling reason as to not short out the K-line). The important thing here is to have a look at the safety plastic separator tag (more compelling reason as to not short out the K-line) There is no 'L' line as such, the 3rd pin is just a status feed connection.

You shouldn't be able to do any damage by shorting the K-line to ground because it's just a comms line and by doing so you'll just be setting it to a permanant 'low' state which won't do anything. So, you should be able to try grounding both of the outer pins in turn to see which one triggers the diagnosis/reset procedure without the risk of damaging the ECU if you happen to choose the wrong pin on your first attempt.

My windows COM port settings just use default settings but I can check the actual setting values when I get home and let you know what they are so you can compare them to yours. OK, these are the Communications Port settings on my laptop's native serial COM port (COM1):-. Bits per second: 9600. Data Bits: 8. Parity: None. Stop bits: 1.

Flow control: None Advanced Port Settings for COM1 shows the following:. Use FIFO buffers (requires 16550 compatible UART): Enabled. Receive Buffer: High (14). Transmit Buffer: High (16) My laptop is running Windows XP 32-bit.

Could you also check the cable connection? I'm not sure how you're mapping pins from the 9-Pin D-Connector to the 16-Pin OBD connector because the connections go through an interface circuit inside the OBD plug so there are no direct connection/continuity between pins on the 9-Pin plug and the 16-Pin plug. Thanks for the COM port settings! Interesting you say that there is an interface circuit inside!

I though that was only on the USB to OBD cables. I just checked my pins from the 9 pin to the OBD plug using standard continuity! Googling OBD to serial also seems to suggest a straight connection. Maybe that's where my problem is!

Does your airbag ECU have a 10-pin connector on it and definitely has all 3 pins in the diagnostic socket wired up (not just 2 of them)? The plot thickens. Today I stumbled across some information that suggested it's actually the Becker airbag ECU that needs to be reset using the Pin-3 to ground method and not the TRW2 unit as I suggested in post #28 and #30 of this thread. So maybe the TRW2 airbag ECU can only actually be reset electronically with a diagnostic machine / software. One thing is known for sure which is that the TRW2 definitely cannot be reset with any of the available DIY software and can only be done electronically by a dealer (or possibly manually like the Becker unit although this is still unclear). A successful reset of the TRW2 by a dealer has been confirmed by someone on the UniDiag forum who paid to have theirs done after failing to do it themselves with DIY software. It would still help to know how many wires are actually connected to the diag connector for the TRW2 and how many pins are in the ECU connector.

Uniscan/Euroscan WILL work with the GM rochester ECU but you will need: 1. A laptop or computer with 2x serial ports OR 2x socketserial PCMCIA serial card. I believe only socketserial will work under MS-DOS. A UNISCAN/Euroscan box with software (the software is free) 3. A serial-to-fiat 3 pin cable. The ability to boot into DOS and have a DOS partition OR a bootable USB stick to boot into DOS. I can make you one once you have sorted out the rest.

I found the best place IS NOT ebay as people do get different quality. Some people even found their uniscan box to be empty! For the best quality and price try www.viaken.pl the shipping from poland to UK is around £25 if i remember correctly. So are you telling me that the ecu scan without the euro box is not possible???? Why i need 2 x serial port??? Did you try like this and it is working?

Thank you a lot. The only systems, at the moment, that work with the GM Rochester are Fiat Examiner (at over €2000+) or Uniscan/Euroscan (€100 which is the box and the cables but excluding the 2x serial port cards). FiatEcuScan.MAY. add support in the distant future but for now, those are the only two options. Uniscan 1.83/Euroscan DOES work very well with it, but GM Rochester is a SELF-CLEARING Ecu so there is not much point! You need 2x serial ports.

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