wyckyd

Eclipsed: OBD1 does stream info. I have a 95 Blazer with OBD1 and my dad has a 99 Explorer with OBD2 and both have about the same streams. I have used the computer that mechanics use to check your computer for error codes. It will stream everything from RPM to O2 level. There are like 40 or so streams from different components. The program used there is called Pathfinder. There is a product available on the web, I can't really remember where I saw it, but it was a program that would read both OBD1 and OBD2 and came with all necessary cables to hook up to a laptop (or car pc). I think the 1 version was about $300 and 2 was $500...not exactly cheap but it can be done.
CivicDisturbance: not cheap to do

DavidL

wyckyd,
Just to be "picky", OBD1 and OBD2 do not "stream" data. They are Request / Reply systems. The software requests the info, and then the controller returns it. This can be done many times in a row so it looks like it is "streaming".

One of the fundamental diff between 1 and 2 is that 2 was gov't mandated with certain data elements accesible in a standard way. Different OEM's implementation of OBD1 may have very similar data, but it wasn't mandated. So, each OBD1 vehicle will transmit it's own set of supported data. Also, the methods of connecting to the vehicle was OEM specific. So, there are fewer software / hardware tools out there for OBD1 because they were pretty much specific to the particular vehicle. Your 95 Blazer is supported by Ease Diagnostics scan tools (www.obd2.com). But, a Jeep is not. They apparantly decided at the time to not incur the development expense for the Jeep. OBD2 is different - the standard method works with all standard (OBD2 complient) vehicles.

Enhanced data is yet again another story. Additional data is available, but in an OEM specific way. Connecting to controllers other than the engine controller is yet another can of worms - each module has got it's own method of access and unique data that is available which must then be transformed into people speak (degrees, rpm, mph, etc.).

CAN electrical architecture is the current tweek. Very few aftermarket scan tool companies currently support CAN due to it's newness and significant hardware and software changes from prior architectures. But, there is TONs of data available via this pipeline (faster too).

Frits

Anybody has some information about BMW? I drive a '92 E36 325i, which is certainly OBDI. I know where the connector is, but where do I get the cable or the software?

Thanks

soundoff

I have a 1991 Subaru Liberty (Legacy elsewhere in the world) with OBD1 (subaru called it "select monitor")

I have made a serial cable, and have found a working command set from a 1997 WRX. I can request data from a certain address, and can stop the transmission of that data. only problem is the list of addresses i have for the WRX is obviously different from my ECU and i dont know what values to ask for.

Does anyone know of a site that lists the command sets for various vehicles? Protocols for the 89-94 liberty / legacy or early 94-96 WRX impreza should all be the same... any info would be really appreciated. thanks

nzKAOSnz

If you have an older legacy - 88-92ish (and maybe the next gen) - on
http://bbs.legacycentral.org, search for scantool....

nzKAOSnz

(hmm- if the site hasnt been hacked that is....)

Bobberty

Any solutions for Jeep Cherokee 2004? (Overland)

DavidL

Bobberty, Jeep 2004 supports OBD2 - so lots of solutions. Read these threads for apps and devices that support obd2.

Bobberty

I'm no electronics person so I would need my hand holding here. Does anyone know where I can get any information on location of ports, suitable software etc?

djesco

For a group of modern day gear heads I am disappointed in all of you.
I am providing the the following for all of those who own a 92-95 Honda. More specifically I am providing the following so you can interface. to your vehicles and write some good software (Hint for the programmers)
Pop open your ECU normally located under the carpet on the left passenger's side kick panel (you know between the door and your feet) typically for USDM and Canadian manufactured Honda vehicles. Assuming you know what you are doing carefully remove the ECU (make sure the car is off and Battery is disconnected) Take the top Lid off (this is the one with the 5 screws on top and no ridges) Locate an area screened in white "CN2" This is a 5 Volt TTL port and the pin outs are as follow reading from left to right.... meaning from the vehicle's connectors to the EPROM 1: GND 2: RX (send Data from the PC to the ECU) 3: +5 Volt 4: TX (send Data from ECU to the PC) 5: N.C. (not connected)
This uses half-duplex (RX and TX are connected and also Gnd) Note this is the stock configuration.
You can convert your ECU to a Full Duplex system however you will no longer be able to use the diag harness located under your dash if you do this.
PGMFI Notes: J12, when removed, disconnects the receive line from the transmit line, so the serial port can work in full-duplex mode, meaning both devices can send to one another simultaneously through CN2. This, of course, breaks the stock diagnostic connector under the dash. However, the benefit of full-duplex mode is more reliable Data Logging. Some programming work is in progress to take advantage of this to log data at a much higher sample rate without clobbering any commands sent to the ECU.

On a JDM P30 (Small Sqaure) ECU it is the J4.
Now for the disclaimer: Please note information and serves for educational purposes only I am not responsible for any damages or if you mess up your own ECU.

In addition you can use a TTL to USB or a TTL to RS232 Serial Cable to Pick up the Signals and then translate within the software.
remember don't confuse TTL for RS232 although these both have RX and TX signals. also remember there are 5volt TTL and 3Volt TTL systems.

And finally I am just kindly saying I am disappointed. In actuality I am very proud of my community. If were not for people like all of us in here Hobbiest, Techno Junkies, etc... Bill and Ford would of never taken interest and copied what our community has done.

Sincerely,

D.Esco
of MobileEmpire.org

jsingh90210

uhh yea I gots a freakin complicated mazda 929 and I'm like to monitor my performace.

djesco

*sniff Sniff

djesco

Okay here is the whole spill if you want help on this need suggestions etc. you can email me direct> status@mobileempire.org or call me 832-798-0000 or here on the forum. I perfer the forum that way all benefit. I've been chipping out and kitting ECUs for Hondas for 2years now. I wont say I know everything theres allways room to learn more.

jsingh90210

we ll I just want to read some of the major sensors (coolant temp, MAF, timing advance maybe?). It'd also be cool if could control the vris system

djesco

I am offering data logging conversions for Honda and Acura ECUs that are OBDI for those who are interested. (832)798-0000