OBD Serial Data

[wilbo666]

No news from me

Cheers
Wilbo

[TERRA Operative]

Interesting read. I'm looking into making something like this for my Corolla.

I might have to revive this subject and do some more development...

[bk_]

TERRA + others,
If you guys want the code (in C, for microchip PIC ucontroller) and basic schematic diagram, I'm happy to post. I've done nothing with the project for over 2.5 years. Just give me a yes and she'll be up in the next few days.

The code is specific for MAP sensor, ISCV and has speedo correction for my custom setup. This can be easily removed and other functions to process data can also be added without pain (if you know bits of C or prefer inline ASM).

The "hard" part is constructing the PCB and box. I took the cheap and crude method of etching it myself... once it's in the box it doesn't matter :>

[TERRA Operative]

Very yes.

I got an engineer at work on the job to help me out, and it turns out one of our products (actually a wall controller for our AC systems, with in built serial interface) can be easily adapted to bit bang the output from the ECU and process then display the data on an LCD much like a Scan Gauge.

I plan on getting a few PCB's made once it's done, so we might be able to have some fun...

[river]

Hi,

Just go to the news agents and buy the Feb 2010 issue of the Silicon Chip magazine. It has an OBDII project that plugs into your ECU and lets you display all the info you desire onto a lap top.

As all Silicon Chip kits, it will no doubt soon be appearing in Jaycar and Altronics stores. It's complete and all you need is the actual software to run on the lap top.

This kit will run with the following software....

EasyObdII V2.xx
http://www.easyobdii.com/

wOBD V1.51
http://www.obd2crazy.com/software.html

ScanTool V1.15
http://www.scantool.net/scantool/dow...stic-software/

Where EasyObdll provides more information than the other two.

So, get the kit, build it, download one of the above programs for your lap top.. connect kit to ECU and lap top.. then have fun.

seeyuzz
river

[bk_]

OK. Here she is:

http://trap.mtview.ca.us/~xk/files/t...r-v0.1.tar.bz2

It's a bit bare in terms of documentation but if you know how to design and implement microcontroller projects and products, it's a no brainer!

Any questions or comments, throw them my way.

[bk_]

Errr... here's my response after forgetting about this thread:

Q1: What is the weighting of each binary bit in mV?! (20mV?)

it's scaled from 0 to 255 (8 bit ADC), so yes, ~20mV

Q2: Have you confirmed that the MAP reading is in kPa?

Confirmed? no, apart from loosely comparing it with a mechanical and electrical boost gauge. The scale and offset is probably only "off" by 10%, so i'm happy with it. I couldn't find any other way to interpret the raw data other than in units of kPa.

Q3: What is your 1JZ-GTE out of?! My ecu is JZZ30 (from the identification words it looks like yours might be the same?).

My 1jz is from a JZX81 (chopped loom FTL) but with JZZ30 wiring. I've ran it with JZZ30 and JZX90 ecus, auto and manual, and all read the same except for chipped ecus, which have far better ignition and fuel maps.

What I'd like to check for interest sakes if whether a PowerFC outputs toyota OBD1 information, too. It really doesn't matter since a hand controller shows more information at higher frequency... but atleast I will be able to easily reverse engineer the remaining parts of the OBD1 signal! So stay tuned within the next month :>

[wilbo666]

River,

This thread is talking about OBD data, NOT OBDII.

They are significantly different things.

The threads you have listed are useless for non VVTi engines.

Cheers
Wilbo

[river]

Hi,

Well sorry about that.

Mehh.. my post can stay for those that do want OBDII and find this thread.

seeyuzz
river

[madmont]

Hi,

Just go to the news agents and buy the Feb 2010 issue of the Silicon Chip magazine. It has an OBDII project that plugs into your ECU and lets you display all the info you desire onto a lap top.

As all Silicon Chip kits, it will no doubt soon be appearing in Jaycar and Altronics stores. It's complete and all you need is the actual software to run on the lap top.

This kit will run with the following software....

EasyObdII V2.xx
http://www.easyobdii.com/

wOBD V1.51
http://www.obd2crazy.com/software.html

ScanTool V1.15
http://www.scantool.net/scantool/dow...stic-software/

Where EasyObdll provides more information than the other two.

So, get the kit, build it, download one of the above programs for your lap top.. connect kit to ECU and lap top.. then have fun.

seeyuzz
river

Does any of this work on JDM Toyotas with OBD2 sockets which are not OBD2 compliant?

[river]

Hi,

I don't know. If it is only the socket that is different, and it supplies the necessary signals, and the data stream is the same, then it should work.... just need to get the right socket.

seeyuzz
river

[amichie]

Can you buy something ready made from egay or something?

Hi,

Just go to the news agents and buy the Feb 2010 issue of the Silicon Chip magazine. It has an OBDII project that plugs into your ECU and lets you display all the info you desire onto a lap top.

As all Silicon Chip kits, it will no doubt soon be appearing in Jaycar and Altronics stores. It's complete and all you need is the actual software to run on the lap top.

This kit will run with the following software....

EasyObdII V2.xx
http://www.easyobdii.com/

wOBD V1.51
http://www.obd2crazy.com/software.html

ScanTool V1.15
http://www.scantool.net/scantool/dow...stic-software/

Where EasyObdll provides more information than the other two.

So, get the kit, build it, download one of the above programs for your lap top.. connect kit to ECU and lap top.. then have fun.

seeyuzz
river

[TERRA Operative]

Ok, Got the programming chick at work on this doing some coding on this with the promise of chocolate.

Has anyone worked out what the full list of values is? I'm working off a bit of deduction and what's been found so far, but I assume the following:

0x00 UNKNOWN
0x01 Injector pulse width (INJ)
0x02 Ignition timing angle (IGN)
0x03 Idle Air Control (IAC)
0x04 Engine speed (RPM)
0x05 Manifold Absolute Pressure (MAP)
0x06 Engine Coolant Temperature (ECT)
0x07 Throttle Position Sensor (TPS)
0x08 Speed (SPD)
0x09 Target A/F Left (I think)
0x10 Target A/F Right (I think)
0x11 Flags (#1)
0x12 Flags (#2)

Could 0x00 possibly be air temp?


Also, what happens with an AFM vehicle? I assume the MAP signal becomes Airflow?
I'll have access to a few 4AGE ECU's and a 5EFHE to test this on when it's ready.

[amichie]

I posted this a couple of years ago.
This is about all I have so far.

[Gavatron]

I'll bang the Intelligent Tester 1 on my JZX83 tomorrow and see if it picks it up (being ADM). I'll write down a list of all the data output in order.