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UTC quote
I have noticed that there is a lot of information about the older carburetor Vespa engines on the web but hardly anything about our modern injected Vespa engines. Because a lot is controlled from the ECU it's often vague when dealing with injected engine complaints.
After a lot of googling I found out that there is a lot of information for the other injected Italian bikes (Ducati and MotoGuzzi) but hardly anything for our injected Piaggio's. Their information is very useful so I have combined it in this Vespa tutorial.

There are actually 2 programs (freeware/donation) that should work with the Magneti Marelli MIU ECU placed in our injection Vespa's.

These are IAWdiag and JPdiag (in this tutorial I will use IAWdiag).
IAWdiag: http://www.von-der-salierburg.de/download/GuzziDiag/
JPdiag: http://jpdiag.akress.com

I've tried IAWdiag and did some tests with my '14 GTS300 (MIU3G) and a '09 GTS300 (MIU1), both are communicating fine with IAWdiag.

So if you are interested in a such a diagnostic tool, check your ECU and see if it is compatible with the program.

On the side of the ECU you can find a sticker with the type/serial number of the ECU.
The picture below shows a IAWMIU3G ECU (2014 Vespa GTS).

External inline image provided by member with no explanatory text

Here is a list of compatible (selectable) ECU's in IAWdiag
If your ECU is in the list then IAWdiag should work.

External inline image provided by member with no explanatory text

What do we need to build our diagnose tool:
- pc/laptop with Windows XP and higher
- VAG KKL cable (preferred with FTDI chip)
- Fiat OBD cable
- Multimeter

To start with the pc/laptop. I run IAWdiag on an old Windows XP laptop from 2004 and a Windows 7 starter Netbook from 2009, so the specifications are very low and the older pc/laptop will do the job.

About the cables: To start with the VAG KKL cable, I have bought two of them and only one is working fine. Both bought on eBay but they sell them on Amazon as well.
The first, not working one, has a cheap Chinese CH340 chipset (more information about this cable: http://jpdiag.xooit.eu/t4569-VAG-KKL-CH340T-hard-wiring-Pin-16-and-pin-7.htm). The other cable has an original FTDI chipset and is working great.
You can find this item on eBay (item 161743974836)

External inline image provided by member with no explanatory text

The second cable is a Fiat OBD cable with 2 crocodile clamps (red + and black -).
You can find this item on eBay.

External inline image provided by member with no explanatory text

IMPORTANT: check the correct wiring of the Fiat OBD cable. It should be wired according the scheme below:
OBD plug (female): pin 5 - GND, pin 7 - K-line, pin 16 - 12V+
FIAT plug (male): pin 2 - GND, pin 3 - K-line
If this is not the case and the wiring is incorrect, do not connect because you will damage your ECU.

External inline image provided by member with no explanatory text

NOTE: some cables does have OBD pin 15 connected to the L-line (FIAT pin 1) and OBD pin 4 and 5 bridged (GND). These cables are working fine but check these connections also for correct wiring and correct pin connection.

When you have all the items mentioned above you can start the installation.
Install the FTDI drivers before connecting the VAG KKL cable.
Don't use the drivers from the disc that comes with the cable.
Download the drivers from the FTDI site (http://www.ftdichip.com/Drivers/VCP.htm).

On a Windows XP/Vista machine these are the correct drivers: http://www.ftdichip.com/Drivers/CDM/CDM20824_Setup.exe
On a Windows 7 and higher these are the correct drivers: http://www.ftdichip.com/Drivers/CDM/CDM21224_Setup.zip

When the drivers are successfully installed you can connect the VAG KKL cable to the pc/laptop. The new hardware is found and should work accordingly.

Check with the following program which COM port is dedicated to the VAG KKL cable.
You can also change this COM port if necessary. In the picture below you can see this cable is installed on COM9
http://www.ftdichip.com/Support/Utilities/Reassign%20COMNo%20Utility.zip

External inline image provided by member with no explanatory text

Now you can test the VAG KKL cable with the following program:
http://members.modernvespa.net/pilaf/uploads/adaptertest_v100_49554.zip

Connect the crocodile clamps to the battery (connect red clamp first, then black).

IMPORTANT: do not connect the diagnose plug/connector.

External inline image provided by member with no explanatory text

Start the AdapterTest program, fill in the COM port and press "connect".

External inline image provided by member with no explanatory text

External inline image provided by member with no explanatory text

When test 1 and 2 are successful press "disconnect".

Another simple test program you can use:
http://www.von-der-salierburg.de/download/GuzziDiag/AdapterTest_V1.01.zip

External inline image provided by member with no explanatory text

External inline image provided by member with no explanatory text

If one of the tests are not successful, then there is something wrong with one of the cables. Do not connect the cable to the ECU to prevent any damage. Check again the scheme of the Fiat OBD and open the VAG KKL cable to see if there is not a fake FTDI chip installed (like my first Chinese cable).

If the tests are ok, both VAG KKL and Fiat OBD are ok, and you can connect the diagnose plug/connector.

External inline image provided by member with no explanatory text

You can now start IAWdiag, fill in the language, COM port and ECU type.

External inline image provided by member with no explanatory text

Go to the upper left en press "file" - "connect" and follow the instructions on your screen.
When the ECU is properly connected you can find the data of your ECU on the bottom left of your screen. You can now select the parameters you want to monitor, read out the fault messages or do some static tests.
You can also start your engine to read out more parameters.

IMPORTANT: Don't do a TPS reset. These ECU's are pre calibrated at the factory.
External inline image provided by member with no explanatory text

Source: Vespa GTS300 2015 ABS workshop manual (page 199 & 200): http://manuals.wotmeworry.org.uk/Vespa/GTS300-2015-ABS/GTS300-2015-ABS.pdf
Source: Vespa GTS ECU: http://cheekythoma3.wixsite.com/itsme/idle

External inline image provided by member with no explanatory text

External inline image provided by member with no explanatory text

External inline image provided by member with no explanatory text

External inline image provided by member with no explanatory text

When you want to quit and your engine is running, use the "kill switch" to turn off the engine.
Then go to the upper left en press "file" - "disconnect" and follow the instructions on your screen.

So far the information how to make your own diagnose tool. I hope that this tutorial is useful to many modern (injected) Vespa riders and enjoy your own DIY diagnostic tool.


Extra information: The IAWdiag software designer has made another program called IAWMIU3GReader, IAWMIU3GWriter and IAWMIU3GEEPROMTool. With these programs you can read and write to your MIU ECU so it should be possible to adjust your mapping.
They can downloaded from: http://www.von-der-salierburg.de/download/GuzziDiag/

I did download my ECU map (.bin file) and my EEPROM (.eep file) as a backup. I also imported the ECU file in the mapping program TunerPro (http://www.tunerpro.net/downloadApp.htm) to see if it's recognized, and it's working in combination with the .xdf file from: http://www.von-der-salierburg.de/download/GuzziDiag/xdf/MIUG3_Piaggio_GTS300_V1.02.zip
Mapping is to complex for me, so I stopped further testing. Maybe there are people on Modernvespa who are interested in this feature.


UPDATE

JPDiag (http://jpdiag.akress.com) is also working with the ECU's listed above.
Tested with the same cables and windows drivers from the tutorial above.
IMPORTANT: test the Fiat OBD and VAG KKL FTDI cable by following the tutorial above to prevent damage to your ECU.

Install JPDiag and follow the installation instructions.

Connect the USB cable to the pc/laptop
Connect the clamps to the battery (connect red clamp first, then black)
Connect the diagnose plug/connector.

Start JPDiag and select your preffered language.

External inline image provided by member with no explanatory text

Select the correct cable. If you use the FTDI cable from the tutorial above, select Galletto Cable and press "ok"

External inline image provided by member with no explanatory text

Press the lower radio button on the right side of the "connect" and press "connect"

External inline image provided by member with no explanatory text

The ECU is now connected and you can see the ECU information.

To get a free license press the blue "copy" button.
This button will automatically open your browser and connects to the JPDiag webpage (http://jpdiag.akress.com/jpdiag.php), fill in the scooter type and email address and you'll receive a license file by mail.
Copy cle.lic file without renaming it into JPDiag directory, usually it's located in c:\program_files\jpdiag\

Restart JPDiag and you can use now all the features.

External inline image provided by member with no explanatory text

External inline image provided by member with no explanatory text

External inline image provided by member with no explanatory text

External inline image provided by member with no explanatory text


If you want some more information about the Magneti Marelli MIU G3 ECU you can check the .pdf document below.
The document is written for both single as twin cylinder bikes (MotoGuzzi V7) but the MIU ECU basics are the same for both so you can use it as reference.
⚠️ Last edited by Pilaf on UTC; edited 16 times
@jkj-fz6 avatar
UTC

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UTC quote
Fantastic! Thank you! Thank you! Clap emoticon Clap emoticon Clap emoticon
I can't wait to try this out!
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UTC quote
Great job! Thank you;-)
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UTC quote
I wonder if this will be compatible with the earlier mp3 500s
OP
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UTC quote
Olestra wrote:
I wonder if this will be compatible with the earlier mp3 500s
Should work if this information is correct: MP3 500 ECU version?
In the mp3 topic they are talking about MIU and IAW15P ECU, they are both in the list of IAWdiag.
⬆️    About 4 months elapsed    ⬇️
UTC

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UTC quote
Great Tutoraial! I just installed the programm and read my MIU1 GTS300 - all working fine. I´m just wondering how I could read/write this type of ECU. I found the MIU3G reader & writer but unfortunately not the programm for my old MIU1.

Did anybody try some mapping on our Vespas with this programm?
OP
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UTC quote
When you are you using JPdiag sent JP a mail and ask him about the price (payware) for a single reader/writer licence for the MIU1 version.

About the mapping, i'm still in the expirimental phase and learning how and the meaning of all the parameters in the mapping. No experience on the MIU1, only MIU3. What I'm most interested in is the difference between the Euro3 and Euro4 mapping. I downloaded both mappings (2015 & 2017 GTS300) and as far as I can see the mapping of the Euro4 is overall "leaner" so that explains the little loss in horsepower.
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UTC quote
Ich would really like to do some setting on my vespa. Will reader about jpdiag and ask him if He can help me. The MIU G3 reader/writer doesnt work on the MIU G1. Thats what I already found out.
⬆️    About 2 months elapsed    ⬇️
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UTC quote
surging at speed
great info on DIY tests. ran all tests with no error codes. at 60 mph on a flat bike surges real bad.full throttle good. no throttle good , letting off alittle or tryin to stay around 60 to 65 real shaky. only 5k on it. went thru belt & clutch all good. dirty injector? any ideas or help appreciated
OP
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UTC quote
Re: surging at speed
GTessence wrote:
great info on DIY tests. ran all tests with no error codes. at 60 mph on a flat bike surges real bad.full throttle good. no throttle good , letting off alittle or tryin to stay around 60 to 65 real shaky. only 5k on it. went thru belt & clutch all good. dirty injector? any ideas or help appreciated
First of all, is your 2015 GTS still under warranty? If so, let the dealer solve your issue.
If not, check the software version. My GTS just received an 2017 update (because i had cutout problems) and i compared the old and new mapping. They have changed the fuel map and the timing map.
If your GTS is uptodate, no fault codes in the ecu and there are still problems then it's better to post your problem on the modern vespa general forum and ask for help, more viewers and more tips.
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UTC quote
upgrades
I recently had nu mapping installed. no change. dealer says try f.i.cleaner
so I ordered malossi lambda emulator. will post results.will post on general
still nu to forum and where to find things Thanks
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UTC quote
FYI I had ecu rechecked had a throttle sensor error. meaning I need a nu ecu. less than 6k on bike hopefully Vespa will warranty it tho out of warranty by 6 months
⬆️    About 5 months elapsed    ⬇️
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GTS250ie
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UTC quote
hi, thanks for the tutorial!
I made it and it have some error codes but how can i know what they are?

P0130:invalid signal
P056:to low
P0201:no signal
P0351:to low

gts250ie 2006 - mui1
thank you
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UTC quote
by the way my vespa is stalling when iddle and the engine check light is on
when the engine dies i have to twist on the grip while pushing start buttom and when parked it drops a little bit of gasoline
besides that it is running very nice with no problens
i made a mistake and tryied to ajust the iddle screw my bad
so now i will try to find if the injector is bad first, the vespa is 2006 but only with 800km, maybee old gasoline did something

i found some help with the code here
http://masrepair.com/repair-services/ecu-engine-repair/ecu-fault-codes-tell-whats-wrong-ecu/

and here
http://www.guzzitech.com/forums/threads/13-v7-v9-miu-ecu-error-codes.12522/
OP
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UTC quote
Sorry to hear that you've adjusted the ECU screw. There is a possibility to put it back in the default but you need the .bin file.
Import the file in TunerPro as mentioned above. The default TPS is in the left corner, for my MIU3G is 3.8 degrees.
When you start one of the diagnose tools you can see the actual TPS degrees.
Now you can try to adjust the screw so that the actual TPS matches the default TPS from the .bin file.
It is a though job and takes some time to get is right but i did it before with a messed up ECU and it worked well.

From your fault codes list there are multiple items which can cause the engine light.
Are the fault codes resetable or not? If so reset them. Start the engine with diagnose tool connected with the fault page active. See if there is a fault popup and try to find out which one pops up first.
The P0130 (lambda sensor) is one of them and the easiest to replace. Could be that the probe is broken and sends a rich signal to the ECU causing a fuel overflow.
Try to replace that one and if the new probe is not solving the problem you can troubleshoot further and try the main MV forum, there is a lot of knowledge available.
Forum member supplied image with no explanatory text
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UTC quote
Thank you very much Pilaf!
I will do as you said and for something more will ask on the forum
⬆️    About 6 months elapsed    ⬇️
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UTC quote
Vespa GTS 250ie ECU TPS reset
Thank you very much, you helped me to solve my Problems, my ECU lost TPS settings due the read out with an "Alientech" ODB2 Cable set, wich supports only the 300 GTS, but not the 250 GTS.
The "Alientech" could save a Mapping image, but after this, the GTS did not start again.
So i ordered 3 stets of ODB2 Cables and Adapters, the last set from "my OBD" did its work.
I was able to reset the TPS and now the GTS runs even better then the time before.
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UTC quote
Good to hear that you are back on the road and that the TPS reset worked.
Once again, all credits goes to the sofware designers Clap emoticon
I'm only the messenger
⬆️    About 5 months elapsed    ⬇️
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UTC quote
Efi technologies
Guzzidiag is a goooood software, but I need to read newer ECUs, any hints?
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UTC quote
What kind of ECU/Vespa/Piaggio are we talking about?
If it is not an ECU from the MIU family you better contact the software developers from GuzziDiag or JPDiag.
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UTC quote
In my vespa I see a EFI Technology ECU.
Guzzidiag diag developer says not interested in this "new" ecus.
Similar:
https://www.scooterwest.com/cdi-ecu-piaggio-fly-vespa-lx-50cc-4-valve-cm088402.html

https://www.efitechnology.it/main_it.html
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UTC quote
If they cannot help, I sure cannot help.
What I know about these EFI ECU types that you can de-restrict them or change them with the programable Malossi ECU. Both options are not part of this WiKi so you better ask/search in the general part of the MV forum.
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Hi does any 1 know we're I can get a piaggio mp3 500 diagnostic cable from please
⬆️    About 4 months elapsed    ⬇️
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Can it be applied to ECU Vespa S150 2v?
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UTC quote
Re: DIY Diagnostic tool for injection Vespa's with MIU ECU
Pilaf wrote:
If you want some more information about the Magneti Marelli MIU G3 ECU you can check the .pdf document below.
The document is written for both single as twin cylinder bikes (MotoGuzzi V7) but the MIU ECU basics are the same for both so you can use it as reference.
The .pdf document appears to be missing. Any idea where it can be found?
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UTC quote
Re: DIY Diagnostic tool for injection Vespa's with MIU ECU
AnnDee4444 wrote:
Pilaf wrote:
If you want some more information about the Magneti Marelli MIU G3 ECU you can check the .pdf document below.
The document is written for both single as twin cylinder bikes (MotoGuzzi V7) but the MIU ECU basics are the same for both so you can use it as reference.
The .pdf document appears to be missing. Any idea where it can be found?
I've just downloaded it - no problem. I've also uploaded it to:
https://manuals.wotmeworry.org.uk/useful%20info/magneti_marelli_miu_g3_information_14854.pdf
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Re: DIY Diagnostic tool for injection Vespa's with MIU ECU
Thanks jimc!

I wonder if this document exists for the MIU1...

Now for the fun questions:
- Is there a timeline for when MIU1 was used vs MIU3?
- Are they compatible with each other?
- Are there any benefits to one over the other?
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Re: DIY Diagnostic tool for injection Vespa's with MIU ECU
Pilaf wrote:
IMPORTANT: check the correct wiring of the Fiat OBD cable. It should be wired according the scheme below. If this is not the case you can damage your ECU.

External inline image provided by member with no explanatory text
If you are looking at the OBD plug on the end of the adapter, the image above will be mirrored. This is the orientation of the pins when you check them:
External inline image provided by member with no explanatory text
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Since I can't seem to read the MIU1 ECU yet, I found a .bin file for a lx150. It can be read in TunerPro using the Scomaldi .xdf file located here: https://www.von-der-salierburg.de/download/GuzziDiag/
zip
522kb
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UTC quote
AnnDee4444 wrote:
I found a .bin file for a lx150.
Located here: http://forum.tunerpro.net/viewtopic.php?f=16&t=4938

I also received a hint that Kess/K-Suite 2.47 can read the MIU1 ECU. Don't quite know what to do with this information, but it seems that Kess requires some specialized hardware to function. I was able to confirm that the MIU1 for a GTS 250 is present in K-Suite, so it looks promising.
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UTC quote
Hi, can i know where you download the new mapping from?
Pilaf wrote:
When you are you using JPdiag sent JP a mail and ask him about the price (payware) for a single reader/writer licence for the MIU1 version.

About the mapping, i'm still in the expirimental phase and learning how and the meaning of all the parameters in the mapping. No experience on the MIU1, only MIU3. What I'm most interested in is the difference between the Euro3 and Euro4 mapping. I downloaded both mappings (2015 & 2017 GTS300) and as far as I can see the mapping of the Euro4 is overall "leaner" so that explains the little loss in horsepower.
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yummyburger wrote:
Hi, can i know where you download the new mapping from?
Pilaf wrote:
When you are you using JPdiag sent JP a mail and ask him about the price (payware) for a single reader/writer licence for the MIU1 version.

About the mapping, i'm still in the expirimental phase and learning how and the meaning of all the parameters in the mapping. No experience on the MIU1, only MIU3. What I'm most interested in is the difference between the Euro3 and Euro4 mapping. I downloaded both mappings (2015 & 2017 GTS300) and as far as I can see the mapping of the Euro4 is overall "leaner" so that explains the little loss in horsepower.
I believe Pilaf was modifying the maps on his own using TunerPro. To the best of my knowledge, there are no "pre-canned" maps available at this time.
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Pilaf wrote:
When you are you using JPdiag sent JP a mail and ask him about the price (payware) for a single reader/writer licence for the MIU1 version.
I emailed JP about the MIU1, and got a response that this ECU is not supported.

Anyone know any other free/inexpensive ways of reading/writing the MIU1 ECU? I am looking into Kess right now, but their isn't a lot of good English documentation.
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I did it with a replica of Galetto V54. I have the file read but need mods now. Did not find the xdf for tunerpro.

I include my file for reference. If someone is able to check it or help to modify

The vespa has a Leovince vintage exhaust, malossi air filter, malossi belt, malossi rollers.

Rgds
zip
522kb
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Hello Pilaf!
Thank you for your topic!
I've been screwing Vespas for a while, old and new.
I have experience with PADS and Rexxer.
I wanted to try new tools now and I have now come across your topic ...
I've gotten the cables and I've found out, that your image of the Fiat cable is mirrored.
The picture shows the plug of the VAG KKL cable!
That would be more accurate to describe ...
Many Thanks!
⬆️    About 2 months elapsed    ⬇️
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Piaggio Liberty 4T 50 3V i-get
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Dear Friends !

is here somebody who has experinces with i-get engines ECU ? I would like to unlock my 2018 Euro 4 Liberty 50ccm I-get Liberty.

Regarding to member here from Greece, in mentioned country is the way reflashing this ECU with "full powered" software MAP (it goes officially via dealer and factory equipment, with online map). Sadly in our country is this a big unknown, so i need to do it myself. I have possibility to get equipments like Galetto, Fiat, KKL cables. I just cannot define which category my ECU is, where should i begin. If have somebody some expriences or can help, i would be very thankfull (and i dont want for free of course).

Thank you !

Ronnie
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dwnldr wrote:
Dear Friends !

is here somebody who has experinces with i-get engines ECU ? I would like to unlock my 2018 Euro 4 Liberty 50ccm I-get Liberty.

Regarding to member here from Greece, in mentioned country is the way reflashing this ECU with "full powered" software MAP (it goes officially via dealer and factory equipment, with online map). Sadly in our country is this a big unknown, so i need to do it myself. I have possibility to get equipments like Galetto, Fiat, KKL cables. I just cannot define which category my ECU is, where should i begin. If have somebody some expriences or can help, i would be very thankfull (and i dont want for free of course).

Thank you !

Ronnie
I would try IAWDiag first, as it is the lowest cost. https://www.von-der-salierburg.de/download/GuzziDiag/

You will need to purchase a fiat 3-pin to OBD2 adapter and a OBD2 to USB adapter.
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AnnDee - thank you very much for reply. All the cables (kkl, vcds obd, galetto, fiat...) are "near" me, because of a friend, who has pro workshop for diagnostics, tuning etc. Sadly, he doesnt have experiences with motorcycles and scooters. Im searching now for some informations, because the 50 iget are not so old engines and i cannot find also any informations about ecu flashing (for derestricting)
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I am going to ask some pretty dumb questions. Where do I find the ECU connector on my Vespa LXV 150? If I somehow manage to get an error code, is there a database where I can find out what it means? There is only one Vespa dealer in my state and it's an hour and a half away! Thanks in advance for any help.

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Vespa GS 160 mk1 MISA / Vespa GL-B 150 MISA / Vespa GTS300 super / Vespa LX50 4V
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Excuse for the late update....

Since the OBD-FIAT cable scheme i posted before was seen from the inside (so mirrored when checking the cables) i have made and uploaded a new scheme. This one is seen from the outside so hopefully this one is more clear. I don't want any unclear schemes because checking the cable for correct wiring is an important part before connecting the cable to the ECU.

Thanks for the comment anndee4444 and olikrug.

I there are more questions or if the links are broken please let me know so I can correct them.
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