Re: [Freediag-discuss] Troubleshooting connectivity ME T16-008 to J1850 vpw/pwm

[camden l. <cam...@gm...>]

Result is here:
http://pastebin.com/eGxfWkgL

Still having issues, although it is at least seeing some communication
from ECU (calls out 1 code stored, no MIL, and 4 O2 sensors)

c

On Sat, Jan 23, 2016 at 8:53 AM, camden lindsay
<cam...@gm...> wrote:
> I think I found it..
>         /*
>          * Figure out cmd to send depending on the hardware we have been
>          * told to use and whether we need to do fastinit or not
>          */
>         switch (dev->protocol)
>
> ...
>
>  case DIAG_L1_J1850_PWM:
>                 cmd = 0x04;
>                 break;
>
>
> Should switch that to 0x80.  will give that a try.
>
>
>
> On Sat, Jan 23, 2016 at 8:45 AM, camden lindsay
> <cam...@gm...> wrote:
>> Perhaps the question to ask is, what companies use J1850-PWM OTHER than ford.
>>
>> Every reference i've read so far on the net either says something like
>> 'SAE J1850 PWM (pulse-width modulation — 41.6 kB/s, standard of the
>> Ford Motor Company)'
>> or doesn't mention a company at all.
>>
>> And perhaps the other companies that use it (if any) use the same
>> standard comm protocol, so wouldn't break?
>>
>> But no idea.
>> I'll see if i can do this shortly.
>> c
>>
>> On Fri, Jan 22, 2016 at 12:47 PM, C. SB <bel...@em...> wrote:
>>>
>>>> Or could communicate some with the vendor as welll, if needed.
>>> I have done just that, and got the following answer:
>>>
>>> " The problem is the use of the 04 command.  It does not do the IFR,
>>> " so the ECU sends 3 responses.
>>> " Use the 80 command and the ECU will stop sending the 3 responses.
>>>
>>> I'm not sure of all the implications, since the ME docs say
>>> "Command 80 - [...] In Frame Response is a internal handshake used by Ford vehicles.
>>> This is why we recommend using command 80 instead of command 04 when
>>> communicating with Ford vehicles. "
>>>
>>> So, if we change the code to use 0x80 for J1850-PWM, will it break support for non-ford ECUs ? I'm not sure.
>>> I should still make freediag accept those triple replies, but in the meantime you could try changing the command code (it's going to be in diag_l0_me.c , in _write() or _send() I forget)
>>>
>>> Let me know how it goes, I'll be on #freediag again.
>>>
>>>
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