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Guide For Focus Mk2/mk2.5 C-Max/kuga ~Elm 327 Cable And Ff2 Program

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#1456 jarp

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Posted 28 July 2013 - 09:31 AM

Anyone having pictures of PCB of interface which works at 500 000 baus? I've been searching for pictures and while they layout is usually the same, there are some differences.,. Some units have more voltage regulators, extra crystal etc. I wonder what is needed to make it work...



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#1457 JW1982

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Posted 28 July 2013 - 09:43 AM

These are some pictures of my cheap Chinese ELM327 interface. It has the FTDI chipset and supports a Baudrate of 500.000.

 

 

P4170374-1.jpg

 

 

P4180375-1.jpg



#1458 jarp

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Posted 28 July 2013 - 10:09 AM

Inteesting, that is the most bulkiest design I've seen. No regulators etc. And yet still it works :o I suspect that more sophisticated designs shuold work just as well - I mean, I know not much about electronics, but regulators, oscillators etc. should help the performance, stabilize the chips and I/O, never prevent anything to work (unless there is design flaw which more bulkier version does not have)... Anyone having more complicated PCB which works? Ie. something like this:

3.jpg

I've been researching a bit and it really should work, if you can configure ELM327 chip for 500000 bus and FTDI chip for 500000 baud and your computer can handle it... Unless, again, there is some kind of design flaw on the PCB.

 

Genuine ELM327 should be able to handle 500 000 baud so I would be quite surprised it genuine chip would not work while chinese clone would...



#1459 minimadgriff

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Posted 28 July 2013 - 11:06 AM

That isn't a genuine ELM you have pictured there, although the seller makes it read as if it is. I contacted them and it is not an original ELM chip. Also it is wired differently to the ELMs that are modified. If you check back a couple of paqes you will I purchased one of these but as it is wired differently as standard we didn't know if it would be safe to use.

 

Check out page 94 http://www.fordowner...program/page-94

 

If you have bought the same one, it is not suitable for modding.

 

Pree added a link a couple of pages back, I purchased an ELM327 from that seller and it runs at 500000. It has a red mother board inside.



#1460 jarp

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Posted 28 July 2013 - 11:22 AM

I bought this one (picture was from some other device just to illustrate differences...): http://www.ebay.fr/i...=item2c7080af79

I will see how it is wired after it arrives...

#1461 jarp

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Posted 28 July 2013 - 11:30 AM

If it is just wires which are different it should be easy enough to modify different type of interfaces also... I am mobile right now so it is hard to check but I have no reason to believe that differently wired devices would not work when rewired properly...

#1462 minimadgriff

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Posted 28 July 2013 - 11:55 AM

That will be a risk you take if you modify a version that isn't tried and tested due to being wired differently as standard. It wasn't a risk I was willing to take.



#1463 jarp

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Posted 28 July 2013 - 04:58 PM

Yeah, well I am pretty confident about modding things as I know a thing or two about electronics, data communication protocols and software engineering... I am pretty sure that given proper attention to details, pretty much nothing harmful can be done by modding device which has a bit different design than tested ones...

 

Of course, you really need to see the device before anything can be said about one specific device... Let's see how my device is wired when it arrives... It may take couple of weeks though, seller is on holiday. I am a bit doubful though, that it will have genuine ELM327 chip...



#1464 jarp

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Posted 28 July 2013 - 05:12 PM

minimadgriff, I dont understand though. I checked out your pictures from page 94 and Pree's tutorial from page 1. Your device and Pree's device are wired exactly the same according to the pictures??? What did I miss?



#1465 minimadgriff

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Posted 28 July 2013 - 05:16 PM

It is different if you compare the pin list I made, to Pree's picture of how you should mod it. 



#1466 jarp

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Posted 28 July 2013 - 05:25 PM

It is different if you compare the pin list I made, to Pree's picture of how you should mod it. 

 

Dude, it is not. Judging from your picture, your device is wired like this:

 

1  - NC
2  - Connected
3  - NC
4  - Connected (soldered to 5)
5  - Connected (soldered to 4)
6  - Connected
7  - Connected
8  - NC

9  - NC
10 - Connected
11 - NC
12 - NC
13 - NC
14 - Connected
15 - Connected
16 - Connected

 

Just like Pree's device (or my bluetooth device which I've modded). Just like every device I've seen?



#1467 jarp

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Posted 28 July 2013 - 05:30 PM

Coincidentally your wiring and Pree's wiring matches very well with OBD2 pinout:

 

2     J1850 Bus+     
3     LS CAN Hi     Low speed (125Kb) CAN bus. This bus used for some IC, RFA and other units.
4     CGND     Chassis ground
5     SGND     Signal ground
6     CAN High     J-2284
7     K-LINE     (ISO 9141-2 and ISO/DIS 14230-4)
10     J1850 Bus-     
11     LS CAN Low     Low speed (125Kb) CAN bus. This bus used for some IC, RFA and other units.
14     CAN Low     J-2284
15     ISO 9141-2 L-LINE     (ISO 9141-2 and ISO/DIS 14230-4)
16     +12v     Battery power

 

J1850 Bus+ is connected, Chassis ground and Signal ground are connected together (you can do this usually), CAN High is connected as well as ISO 9141-2 K-LINE. Also J1850 Bus- is connected as well as  CAN Low, ISO 9141-2 L-LINE and +12v. To sum it up, you have following things connected:

 

J1850

CAN

ISO 9141-2

Ground

+12V

 

Just like expected. And you want to add additional switch which allows you to re-wire CAN connections to LS CAN... Other option would be designing new device which would have both CAN and LS CAN connected at the same time...

 

Edit: You have numbered your pins wrong, that's the reason you got weird results... You "look" connector from the wrong end when numbering pins... Or you use female connector's pin numbering instead of male connectors :) Easy mistake to made, but really, your device is wired exactly the same than any other...



#1468 minimadgriff

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Posted 28 July 2013 - 08:56 PM

Are you saying the connector was looked at from the rear rather than the front? From memory the pin numbers were on the back of the connector not the front where the pins come up out. I wasn't actually doing the mod on that one a friend was doing it for me. I shall open it up and double check tomorrow. 



#1469 jarp

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Posted 29 July 2013 - 05:27 AM

Look at this picture:
 
20130213102233930.jpg
 
So when looking male connector from outside, pin no. 1 is on top right corner. When looking from inside, it's on top left corner. And when looking your picture from page 94, post 1406, picture 5 which is from the top of the connector:
 
1 - C
2 - NC
3 - C
4 - C
6 - C
7 - C
8 - NC
 
Etc. Could be, that if there is numbers written in to your OBD connector, that they are actually wrong. I would not be surprised that cheap Chinese connectors would be numbered wrong...

Edit: And yeah, of OBD2 connector pin numbering is reversed compared to more common and familiar DBx connectors. I would also have misnumbered the pins if I would not have checked numbering using Google... Wtf, who did design these connectors?

#1470 minimadgriff

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Posted 29 July 2013 - 11:55 AM

Taken apart the original one I purchased that we thought was wired differently and the OBD connector isn't numbered at all (which is where the issue lies). Where as the replacement I bought was numbered.

You are quite right the connector has been looked at from pin end rather than the end with the soldered wires. So this one is wired the same way as long as you look at it the right way round, which isn't the logical way.

Well spotted. So this one can be modded too.

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