Re: Help me please !!!!!!!!!!! ISO9141 and KWP2000 !!!!!!!

Hi, and thank you for the fast reply !
I'm ok in programming microchip microcontrollers.
The problem that I have is that i have no response from the ECU, the
K line stay at 1 logic, no start.... nothing !!
All the bytes and the pattern I send is time exact and the same than
the software KWP2000test.

I don't understand... Have you got an idea ?

Thank you

--- In opendiag@yahoogroups.com, "Bülent Özen" <ozenelekt@i...> wrote:
>
> Hi
>
> i believe you realise the ISO-UART fonction with software
> first be sure ( disable the interrupts of pic while transmitting
the ISO char or init pattern ) . stay in 10300 to 10500 baud ( 1%)
> trig on 50% of incoming ISO signal and use a timer to measure the
baudrate.
> sometimes ECU runs at lower baudrate than 10400 ) you have 96 uS of
time to sample it. If you use C for PICs you can have problem while
sampling the input ( delayed )
> perhaps collect first the signal in Ram and work out after ;o)
>
> B/R
> Bülent
>
>
>
>
>
> ----- Original Message -----
> From: nakapuff2001
> To: opendiag@yahoogroups.com
> Sent: Monday, January 12, 2004 2:04 PM
> Subject: [opendiag] Help me please !!!!!!!!!!! ISO9141 and
KWP2000 !!!!!!!
>
>
> Hi everyone !
>
> I made an interface which is 'hardware correct'. I made also a
small
> software for PIC16F876 which can communicate with a PC at 9600Bds
and
> which is able to deal with ISO and KWP2000 at 10400Bds.
>
> Ok, I've got a serious problem ! The vehicules I have (A year
2000
> Peugeot 206 diesel and a Year 2000 Subaru GT turbo)
> I guess that the peugeot was KWP and the subaru was ISO9141.
> Anyway, I tried to generate the Slow Init Sequence and then the
fast
> init sequence....
>
> But poor I am !!! I 've got no response from the vehicule, either
the
> 206 or the subaru...
>
> So I verify the signals at the K and L lines and I have exactly
what
> is described in the ISO normalizations...
>
> For the Slow INIT, I have : 0X33 (LSB first) à 5Bds, then I 'm
> waiting for the 0x55 for baudrate detecting (10400Bds it should
be !)
> and for the KW1 and KW2, then I send the invert of KW2, and the
ECU
> should answer 0xCC....
> But the only thing I have on the line is the generating of my
0x33 at
> 5Bauds and nothing during the next 300ms.... So my program goes
out
> and tell me no response.... There is no response from the
vehicule...
>
> For the Fast Init, I'm doing this :Wait 300ms at the high state,
then
> generate low level for 25ms then high level for 25ms then I send
0xC1
> 0x33 0xF1 0x81 0x66 and I'm waiting for a reply... But nothing
> happen..... :(((
>
> I send the same things on K and L line synchronously... perhaps
it's
> this ?
>
> I use the K line, the L line, the signal Ground and the positive
> supply voltage on the obd plug... Is this correct... I guess
yes !!
>
> I'm desesperate, because my signals are perfect... 25ms+-1µs...
The
> 10400Bauds is exactly generated.... I don't understand....
>
> If someone is able to help me or to tell me what's wrong ??!!
What
> can I do better than perfect signals ???????????????!!!!
>
> I see everyone working on it without difficulties, humm I miss
> something but what and where ??!
>
> Thank you in advance !
>
> Bye
>
>
>
>
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Received on Mon Jan 12 06:27:05 2004