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How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop
Published by red
25-04-2010
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How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

A few folk seem to be interested in arming themselves with a cheap ECU code reader for Mk2 Punto so here’s the “tenner and a laptop” solution.

First,the software. Go to www.fiatecuscan.net and check whether your model is covered. If so, download and install the free version of the software on the laptop. Credit to Yani for writing this programme.

Second, the tenner buys you a USB VAG-COM KKL lead from eBay. As at April2010, prices started from £8.59 (free P&P).

For airbag control reading/resetting you are going to need to open up the big blue plug so it will need to be one that is screwed together (mine was but I can’t vouch for all variants - you can probably see the screw holes in the pics).

Install the FTDI virtual port driver. You can check the port properties through Device Manager. Yani’s website gives some pointers in his “how to use” section but essentially this is just to set the driver latency to minimum (1mS) and to note which COM port the software has assigned to the device (you can change it but shouldn’t need to). My lead came with drivers on a mini-CD but a suitable (newer) driver is available from www.ftdichip.com. This assumes that the lead employs an FTDI chip to create the USB virtual serial port. If it's some other chipset, a different driver may be needed.

Now connect the lead to the EOBD socket. This is on the driver’s side, under the dash, behind the panel to access the fuses (2 screws, quarter turn with a coin). The socket is below the fuses. My lead has a blue LED in the plug that comes on when plugged in (other leads may not have this). Connect the other end to your USB port and launch the program. Click settings and select the COM port (if unknown, you'll need to try each one until it works). Select your car and engine type, select the ECU, switch the ignition on and press F2 to connect. If you get an ISO code error you’ve probably not selected the right model. All being well, it should say "connected". Now play away!

Air bags – If your air bags are supported and you want to clear the fault lamps, you’ll need to modify the lead first. Open up the big blue plug and solder a wire between pins 3 and 7. Note that Yani recommends that the connection from the circuit board to pin 7 should be cut and a switch wired in so that the signal goes either to pin 7 or pin 3. I couldn’t find anything to suggest that any damage would be caused by simply connecting the two pins so that is what I did. It worked OK for me. As before, select your car and this time select your airbag controller type (if unsure just work through the variants). Obviously, if there is a persistant or intermittent fault, the warning lamp will stay on or come back on later but at least you can see the logged error to help decide a course of action.

red
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Old 26-06-2010   #1
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

Thanks for the guide. Currently v2.3 of fiatecuscan has a bug and will not connect to any ECU's unless you pay for a license. v2.3.1 is due shortly to fix this issue, in the meantime has anyone got an old version such as v2.2.1 that they could send me?!

Thanks
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Old 13-07-2010   #2
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

Here's V1.6 if that's any good. It's not really a zip. Rename it to exe.

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File Type: zip FiatECUScan16.zip (1.11 MB, 1629 views)
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Old 12-09-2010   #3
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

Hi;

Could we do the same job with ELM327 interface, or VAG-COM KKL is necessary ?

Thanks.
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Old 15-10-2010   #4
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

Hi,

How do i establish which pins are 3 and 7 in order to solder a connection for the airbag reset?

I have opened up the plug and i can see numbers 1, 8 , 9, 16 on the back i am guessing i can then work out pins 3 and 7 based on those?

Just want to double check. Image of plug below




Thanks,
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Old 16-10-2010   #5
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

i see no image, try hosting it in your gallery on here
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Old 22-10-2010   #6
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

great guide! can't believe i didn't find this when searching around for this info before! Some pics would be excellent to build up my confidence!

Cable I've just purchased is this one: cgi.ebay.co.uk/USB-VAG-COM-OBD-II-KKL-409-1-Diagnostic-Cable-Interface-/260673083796?pt=UK_Diagnostic_Tools_Equipment&hash =item3cb1539994#ht_3116wt_942
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Last edited by L2cifer; 22-10-2010 at 22:58.
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Old 17-11-2010   #7
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

having problems connecting. trys to connect to the ecu and then it says requires registered version and it can only run in "simulation" mode. what does this mean? i thought i could still connect to wipe faults and find out which faults have been registered without paying 50euros to do that. am i doing something wrong? please help.
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Old 09-01-2011   #8
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

which pins are 3 and 7?
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Old 16-02-2011   #9
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

Red means the pins on the EOBD lead.
http://www.pikit.co.uk/peugeotmt/eob...explained.html
shows loads about the EOBD system. Its an industry standard but can others confirm the info is all appropriate for Fiats.

Pin 1 - Ignition positive
Pin 2 -
Pin 3 - Data Tacho / MUX network Late generation
Pin 4 - Chassis ground
Pin 5 - Chassis ground
Pin 6 - Data Climate control/CAN High ('IS' Late generation)
Pin 7 - K Line Data Engine management / Automatic gearbox management
Pin 8 - Cooling fan control information / MUX network Late generation
Pin 9 - Charge information
Pin 10 -
Pin 11 - Data BSI
Pin 12 - K Line Data ABS/ESP/GEP/Suspension control
Pin 13 - Data Air Bag/Headlight control
Pin 14 - CAN Low('IS'.. Late generation)
Pin 15 - Data Engine management
Pin 16 - Battery positive

I presume Yani means fit a switch to make or break the link between pins 3 and 7.
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Last edited by DaveMcT; 16-02-2011 at 11:07.
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Old 15-03-2011   #10
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

Hi,

Am i correct in thinking the free version of this software allows tracking of voltages etc. alongside reading fault codes? I currently have an OBD-II reader but I keep getting the same errors even when replacing faulty sensors so voltage outputs could be useful

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Old 25-04-2011   #11
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

The more complex stuff like airbags needs the fully paid version so probably the same with voltage traces.

Software and cable requirements
http://www.fiatecuscan.net/SupportedVehiclesList.aspx

Main connector cable
http://cgi.ebay.co.uk/ELM-327-USB-1-...item4154aec206

Adaptor cables for ABS, air bag, steering.
http://cgi.ebay.co.uk/Airbag-ABS-P-S...item25628c5f46
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Old 25-04-2011   #12
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

right....i need to reset my airbag light and i am getting a bit confused.do i now need http://cgi.ebay.co.uk/VAG-USB-DIAGNO...item19c4ee9310 this and http://cgi.ebay.co.uk/Airbag-ABS-P-S...item25628c5f46 to make the light go off.I also need to get the software but just read i need to pay for the software,how much is this going to cost me.Sorry for all the questions just dont want to go wasting money i dont need to !
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Old 04-05-2011   #13
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

My daughters 2001 1.2 8V Punto had the light come on.
I read various threads on here that gave various tips of what did and didn't work.
This is what worked for me. Downloaded the free version of the fiatecuscan software . Used a KKL VAG COM interface connector with the red adaptor cable from the fiat ecuscan adaptor leads.
Identified the fault to the passenger airbag isolation switch and was then able to clear the fault to turn off the light.
Great sevice and help from www dot gendan dot co dot uk I hope this helps others along the way.

I don't think you can do it with the ELM 327 interface.
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Old 04-05-2011   #14
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Re: How to read/reset ECU and airbag errors on Mk2 for a tenner and a laptop

.........
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