Paging the OBD-II FOAK

Dec 02, 2006 7 Replies

I'm trying to sort a misfire problem on a 2002 A-Class Mercedes (Petrol).



As far as I can tell this car should be OBD-II compliant. I ordered an ISO OBD-II toy from ebay, based on the ELM323 chip, but I cannot get it to work. I have also tried it on a 2004 Renault DCI-80 (Diesel), doesn't work on that either.



Can anyone please confirm that both the Merc and the Scenic are OBD-II complaint?



TIA


OBD II is the european standard so they will be. should have tried a merc specialist ;o)

While not knowing if the particular A class is ISO you can check

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for pin numbers or
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for compatibility. I assume you are turning your ignition on when using the 323 ? What software are you using ? Gio

Hi, according to

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both ofthese cars are ISO and should be ok, and yes I have tried with bothignition on and engine running. In both cases I just see two red ledson the elm.

I am using Digimoto 4.03 - it reports "bus init: error" I can also see in the log the elm reports its version number, so I know I have serial comms with it.

Thanks

I can only suggest you plug into a friends / neighbours car and confirm that the Elm unit you have is working with your laptop and chosen software (or try another like.

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although if the elm to pc data flow is correct then the software tested is a very minor issue. Simon you need to know what is going wrong because at the moment you do not have a known datum to work from and can only 'assume'.

Gio

Thanks for that. I tried again today, using ScanTool and it worked on both cars. Very strange. I then switched back to Digimoto and also worked. We used to call things like that "finger trouble". Anyways, up and running now.

Glad you are up and going. I found it interesting to see the different info displayed with different software. For example some free applications showed only one fault code P0335. While a couple of others showed those 'pending' i.e P0700 and P1895 as well as the P0335 code.

I wondered about buying Digimoto but in the end opted to try and use the free lite version. I take it the paid for version does not update any quicker ?

Gio

Hi, the DigiMoto I tried was quite slow refresh rate - but I think that is due to the 9600 baud interface rather than anything to do with the software.

You're right, Scantool showed up 'pending' codes as well as the main fault code, whereas DigiMoto just showed the fault code - for what I needed Scantool was fine.

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