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Thread: Help on ELM327 - KWP2000

  1. #1
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    Help on ELM327 - KWP2000

    Hello!

    I am having trouble to initialize the KWP2000 protocol on a Alfa Romeo 156, seems that the ECU don't want to wake up.. after the inicialization routine nothing is awnsered back to the ELM327.

    Can anyone help me ?

    Thanks.

  2. #2
    Variable Bitrate
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    May be it's not EOBD compliant.
    What model year is this car, what engine (capacity, fuel type) is used?
    Where are you located (which country)?

  3. #3
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    Thanks for your awnser.

    I am using a ELM327 v1.3 on a Alfa Romeo 156 1999 2.0 Brazilian version.
    The ELM board has worked fine in others car/protocol. I have only tested the KWP protocol on this alfa romeo, but on the osciloscope the KWP signal seemed fine to me.

    Can u gimme a hand on that?

    Thanks again.

  4. #4
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    What's the engine code and what kind of ecu (name/type) does this engine have?
    How many oxygen sensors does it have?

  5. #5
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    The ECU is a Bosch M1.5.5.
    The car probably is OBD2, not EOBD.

    The elm should work fine, I think the issue is about header and this kind of configuration...

    I couldn't get the engine code yet...

    Is this information helpful?

  6. #6
    Variable Bitrate
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    Engine code is probably 323.01. You can find this code on the vin-plate under the hood.
    The text is usually Italian and reads either "Motor" or "Motori".

    OBD2 is a standard for cars sold in the USA and Canada. This car has not been sold there, so it's not compliant with OBD2.
    EOBD is the European version of this standard, but this engine does not have to comply until 2001, so it's not compliant with this standard either.
    I don't even think there are any standards which the car has to comply to in Brazil.
    How many Oxygen sensors are there in the exhaust? And where are they? In front and/or behind the catalic convertor?

    You need the Alfa specific protocol to communicate with this ecu.
    There's a program called Alfadiag which should be able to read your car.

  7. #7
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    Humm.. it has only one O2 sen, its between the engine and the cat. Almost every brasilian car follow one OBD standard, I think it depend where is the ECU from, becouse we do not make ECUs, can be found Magneti Marelli and bosch on cars made here.

    I will do some research over the AlfaDiag inicialization routine, all place I have read about OBD and ALFa romeo it says "KWP2000".

    Thanks for your time! It was of great help.

    Fanl

  8. #8
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    You will have to buy Alfadiag for 60 euro.
    Here's the link: http://www.alfadiag.net
    You can dowload a 30-day demo version from the above web site for free.

  9. #9
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    Dear p2psmurf,
    I have downloaded the trial version of Alfa Diag. I did some analisis throught the serial port of the initialization sequence for the Bosch M1.5.5 (selected on the Alfadiag), and got this data frames, could u gimme a hand on that ?

    Code:
    Start string of Bosch M1.5.5 obtained by examining Alfa Diag on Serial Port
    
    (click connect on AlfaDiag)
    Car Received:		F0 @ 200baud 				-> 25ms INIT
    (I awnsered F0 @ 200baud)
    Car Received:		80 10 f1 01 81 03 @ 10400baud		-> fst byte is 80 - It is not the frame size - NOT OBD STANDART
    								   3 byte header: 80 - Priority
    										  10 - ECU address
    										  f1 - Scanner address
    								   data	bytes:    01 81 - Mode 01 (Show courrent data)
    											  PID 81 - Dunno what's it.
    								   checksum:	  03
    So, are my assumptions o'right? On KWP standard the header isn't suppose to have the first byte as lenght of the packet/frame? If my assumptions are right I am able to get ELM working on this KWP protocol, by seting Static Header and aderesses plus 25ms of Initialization.

    Please. give-me your opinion.

    Thanks again for the guidance! You are saving me

  10. #10
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    I also got good information of the Alfa Romeo 156 that I am testing:

    Model Version: 116.865.0(0) - BN 2.0 TS 16V CF2 RICCO - BRAZILLE
    Engine Stamp: AR 32303
    Car Version Code: 932A2
    Engine Version: M5 - 2000 TS Brazil

    Well, you almost said the right engine code, wrong by 1 digit But I am pretty sure that both engines (323.01 and 323.03) have the same ECU (M1.5.5), so, I will try to make ELM able to talk using the configuration registers of it.

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