Technical Anyone had any success with an ELM323/327 interface

[svdath]

Hi,
I am trying to get the OBD connection in my Fiat engine [its a fiat 1.3 MJT engine sourced to a Indian manufacturer, TATA].

These are commands that I used and the buffer dump, Can anyone explain what is the result mean:

ATZ
>ATL1
OK
>ATE1
OK
>ATTP5
OK
>ATSH 8110F1
OK
>1800FF00
BUS INIT: ERROR
>atbd
05 81 10 F1 81 03 FF 00 F1 0F 10 00

 

[danhans115]

From looking at what is in the buffer it would seem that the vehicle doesnt use the fiat protocol. The ECU may be at a different address to what Fiat uses as standard (0x10h). In fact even though its a Fiat engine it may well use a different ecu, or the same ecu with some OEM software on it.

For more help you may want to join up to the opendiag group here - http://tech.groups.yahoo.com/group/opendiag/

lots of information on there regardign different vehicles and applications.

Best of luck

Dan

 

[thunderfox5]

Well, since it's a 1.3 Multijet, it should comply to EOBD already!

 

[danhans115]

Well, since it's a 1.3 Multijet, it should comply to EOBD already!

Not really, since the car is a Tata and the guy lives in India. EOBD is for cars destined for European markets, not cars of European origin..

Also I would have thought the ECU software was sorted by Tata themselves, rather than Fiat..

 

[thunderfox5]

I think not, dan... If you go buy a Ford Fiesta for example, the MK5 model, they use PWM or VPW, rather than the EOBD method... I think it has to do with the origins, rather than where it is sold... Japan for instance adopted EOBD themselves, and that is why you see it in japanese cars a lot

 

[danhans115]

They are two different things, VPW/PWM is electrical physical standard, and is also part of the EOBD standard, as is ISO-14230-2 same as Fiats.

But VPW/PWM isnt comparible to EOBD as its part of it..

VPW/PWM is just the physical transmission method, and has nothing to do with the data exchange.

Like we have been discussing here, our fiats are using ISO 14230-2, which can be compared to VPM/PWM, and is also part of the EOBD standard. But as we found, not all Fiats that use ISO14230-2 are EOBD, otherwise they would respond to ecu address 0x33 as well as 0x10h

@ The question. Looking on the google, it would seem that the Tata's use ISO-9141-2. Could be worth setting the protocol to that and trying again perhaps?

 

[svdath]

@ The question. Looking on the google, it would seem that the Tata's use ISO-9141-2. Could be worth setting the protocol to that and trying again perhaps?

I have already tried this but to no avail. Will try again and post the dump to see if it gives out anything

 

[thunderfox5]

No dan, the protocols change a lot, in regards to how they work... Not even the working voltage is the same.

Our cars (the pre-EOBD ones) use a variation of ISO9141-2 called Fiat 9141. There's a specification for it posted a few pages behind.

I'm guessing your Multijet engine uses the same protocol!

 

[danhans115]

Nope, they dont. read the document. The pre EOBD fiat cars use ISO-14230-2, prior to ISO14230-2, they used ISO9141..

Why do you think you were selecting ATTP5 a few pages back? KWP2000 is ISO14230-2 - not ISO9141...

It tells you this is on the SAE and ISO documents, Ive read them

 

[thunderfox5]

Yeah, you're right (as usual). Just checked it

Still, any Multijet engine should use the same protocol, as the ECU is the same!