OBD Serial Data

[wilbo666]

Hi guys,

I'm trying to track down some info that I think is in the Toyota Technical Education Network documents (T-TEN). http://www.toyota.com/about/tten/multimedia/index.html

Anyone here work at Toyota and can give me any info on T-TEN or where to get the training documents that go with it?

Otherwise I will start emailing every institution over in the states that undertakes T-TEN training

Cheers
Wilbo

[WiLo]

rolla boy does i tihnk from memory but not 100% sure

[1200det]

What are you wanting to Know ?

I have a few of these technical training manuals

.

[wilbo666]

I'm trying to uncover information on Toyota ODB serial data. There are various references to it in the documents listed on www.autoshop101.com.
(http://www.autoshop101.com/autoshop15.html)

In particular paragraph one of 48 OBDII#3 - Data Interpretation.pdf (h48.pdf @ http://www.autoshop101.com/forms/h48.pdf) says
"...refer to appendices A & B of this handbook. They provide detailed definitions, specifications, and an explanation of each data parameter available on OBD, ..."

Would it be possible to find out what the handbook that this excerpt is taken from, or even better find Appendices A & B?

Any other information that you could offer me in my search would be most appreciated!

Cheers
Wilbo

[Norbie]

I thought ODB was an open standard used by most manufacturers, and thus should be explicitly defined somewhere on the web? Not that I've actually gone looking mind you.

[wilbo666]

I thought ODB was an open standard used by most manufacturers, and thus should be explicitly defined somewhere on the web? Not that I've actually gone looking mind you.

Big difference between ODB and OBDII (96 ->).

OBDII has load of info around on it. ODB on the other hand...

The ODB standard didn't require serial data output (OBDII does), however Toyota did implement serial data output...

A few notes, it is very slow! 100BAUD! (updates ~1.25seconds), between 14-20 status words, does things like temp sensors, speed, injector pulse width, MAP, TPS etc.

Cheers
Wilbo

[brett_celicacoupe]

about time you are doing this


how much will the finished program cost? maybe we could trade in MS65 hub currency

[82MKII]

Wilbo,
I got excited about this a while ago. After a lot of scouring, I found NOTHING of use on OBD. In the end I figured it will probably be easier to directly measure what I wanted (eg temp sensor, injector pulse width, ...).

Regards

Peter

[wilbo666]

Wilbo,
I got excited about this a while ago. After a lot of scouring, I found NOTHING of use on OBD. In the end I figured it will probably be easier to directly measure what I wanted (eg temp sensor, injector pulse width, ...).

Regards

Peter

Yep, I do recall that. Did you try to chase up T-TEN docs?

I agree that some good old reverse engineering may be in order, but by finding someone that works at Toyota I maybe able to gain access to a scan tool to send "spoof" data into to sort out what is what easier than on car measurements!

Oh and Brett, I'll be trying and make it open source /free if I can!

Cheers
Wilbo

[amichie]

Hi guys,

I'm trying to track down some info that I think is in the Toyota Technical Education Network documents (T-TEN). http://www.toyota.com/about/tten/multimedia/index.html

Anyone here work at Toyota and can give me any info on T-TEN or where to get the training documents that go with it?

Otherwise I will start emailing every institution over in the states that undertakes T-TEN training

Cheers
Wilbo

I emailed the contact at autoshop101 asking this exact question without any answer.

I would be very interested if you find out how it is encoded and I would be happy to write a simple PC based program to decode it that I would be happy to give away.

I know my mx83 is equipped with this early obd and it is only about 35 bytes long.

8 bit words but you need to know what each one means.

BTW : From the title of your thread you could not tell its such an interesting topic.

[Grega]

8 bit words but you need to know what each one means.

my stale memory just got jogged

prolly a little off topic, but kinda relevant, i helped a guy some years back with his piece of software for commodores.

the early 1227808 delco ecu's used 160 baud OBD and the later (94 - VR) used a myriad of differently coded ECUs which were 8192. these were OBDII

the 8 bit word stuff i remember this had like a header and a checksum so the core of the word was only 6 bits or something. i'll have a look and see if i can find the correspondance (going back a good 5 years it would be now)

but yeah, change the topic name. very interested in this stuff

[Grega]

wilbo, check your PM's

[wilbo666]

I emailed the contact at autoshop101 asking this exact question without any answer.

I would be very interested if you find out how it is encoded and I would be happy to write a simple PC based program to decode it that I would be happy to give away.

I know my mx83 is equipped with this early obd and it is only about 35 bytes long.

8 bit words but you need to know what each one means.

BTW : From the title of your thread you could not tell its such an interesting topic.

It says on the autoshop101 website that they will only reply to students emails....

Indeed, I'm also happy to write the PC software, but like you say finding the data is the first step.

At this rate I am simply going to send in spoof signals and work it out!

Cheers
Wilbo

[wilbo666]

Bit of an update...

Got the CRO out last night.

To get serial data output short TE2 to E1 (gnd). Note on my 1jzgte (ex JZZ30) the engine bay diag box does not have TE2 ! (or W !) I have to access these near the ECU on the loom plugs. The serial data output comes out of Vf.

Vf output is TTL (0-5V). I'll whip up a TTL -> RS232 convertor today andd see if I can see the data on the PC...

Cheers
Wilbo

[82MKII]

Wilbo,
good luck with it, but looking here http://www.elmelectronics.com/connect.html, it looks like a lot of the OBD data streams aren't straight ttl level rs232. Looks like PWM & other coding is common - hence the reason I went off the idea, seeing as I couldn't find any definitive info about the 1JZ ODB data stream.
Good luck with it anyway.

Regards

Peter

[wilbo666]

The CRO looked very much like TTL RS232 to me, but indeed will have to wait and see.

That website is talking about ODB-II again. SAE J1850 is OBD-II
(http://www.interfacebus.com/Automoti...J1850_Bus.html)

ELM630 (also listed on that site) looks like a primitive CAN?...regardless it isn't what I'm investigating, it is much faster than Toyota OBD etc

Also Toyota's OBD is uni-directional; output data only!

Cheers
Wilbo

[wilbo666]

OK, I setup an old Atmel dev board I designed and never got around to using (until now) to sample the waveform (I only have an old CRO) so that I could see the waveform.



The atmel was taking a reading every 1msec and outputting it via the uart to the PC where it was logged (yes there is time to do that @ 57600Baud).

I then plotted it in excel, and then took screen shots or a section of data that looked like it was complete to put it into paint so that I could overlay a timing section to make it easier to work out the binary values. (see excel file HERE)

I then wrote the observed binary values into notepad and tried to see if I could make out the serial data format. (see text file HERE)

I only detected 14 words (the T-TEN documents say that there should be 14-20...).
[EDIT: found the 14th word (I had two number 9's!) ]

I'll have a closer look at it when I can and see how we go, I may have indeed made mistakes along the way.

Progress is being made! If others want to look at what I have so far and see if I've made mistakes etc go for it! That would be great!

Cheers
Wilbo

[brett_celicacoupe]

pic dont work man.....could be me though?

[amichie]

OK, I setup an old Atmel dev board I designed and never got around to using (until now) to sample the waveform (I only have an old CRO) so that I could see the waveform.

Hi Wilbo666

Can I just confirm with you if the engine was running or not when you collected the data?? It looks like it was not.

Could you also say if it was warmed up or stone cold.

Thanks

Andrew.

[wilbo666]

Hi Wilbo666

Can I just confirm with you if the engine was running or not when you collected the data?? It looks like it was not.

Could you also say if it was warmed up or stone cold.

Thanks

Andrew.

Not running, at room temp.

I'm assuming that the data is outputted in the same sequence that the autoshop101 doc (47) shows on the screen of the diag unit.

If my assumption is correct then the 4th data word should be RPM which should (and is that data) zero when the car isn't running!

Cheers
Wilbo