teo256

Do you have ODB2 in your BMW? If yes, can you make a picture so i can check in my car too??

Thanks

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Tippa

Yes, i think so... At last service they connected some kind on scanner to this plug, under the hud:





Mine E36 325i -91 uses this protocol (i think)
• ISO 9141-2. This protocol has a data rate of 10.4 kbaud, and is similar to RS-232. ISO 9141-2 is primarily used in Chrysler, European, and Asian vehicles.

I will try to make my own connector cable and ISO to RS232 converter (some day soon..).

Sorry my bad english

teo256

I have that connector too, i've used it to reset the inspection led. So, it is possible to use it as ODB2 with some kind of software?

Do you have found a project for the connector? I have time and ability to realize it.

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takeda

the above table with the bmw diagnostics socket pinout is incomplete.somewere after 2001-2 bmw switched to canbus CAN BUS protocol of OBD2 so another pinout will be usefull if there is no J OBD2 socket in the car

see the other bmw thread

teo256

i have 1995 bmw...

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squat

Hi

I like Tippa's information provided... Just a few things to say:

If you wish to make a converter from RS232 to ISO 9141-2 (K-line), please consider the following:
- Transceiver IC's of both standards exist, you can simply hook them together and get a "dumb" converter. This is OK, provided you either write your own software or find some software that supports this... bringing about a problem:
- RS232 standard does not (normally) support 10.4Kbaud. The closest speed is 9600, but it is not close enough. I have written software before that does this... its simply done by using a non-standard divisor of the RS232 clock (115200 / 11 = close enough to 10400). Think it's a hack? well that's what is used extensively in OEM... main difference is they write their own software to do exactly what they need.
- Transmitted messages from a PC are received simultaneously as the K-line has a shared Tx/Rx line
- Alternatively, you could use that bloody ELM 323 chip that is supported by lots of software, just costs a fair bit of $.

Anyway my point is this:
For my 1991 BMW e36 (which I believe has K-line), I have made a dumb transceiver as explained, and I am trying to get some sense out of my car. The pics Tippa provided match my car exactly, but I want to find out the following:

Tippa, where did you get these pics from???? Also, what protocol is used for this communication, it doesnt seem like K-line, as it shares Tx and Rx lines and your diagrams have separate.

I am desperately trying to get this working, I will post any info if i get it working as it's hard to find.

dmtracey2000

I have a 1993 325 is bwm and I am looking for a obd1 scanner so I can help determine any codes I am receiving. Does anyone have any information on where to look for one at. I have searched but I keep coming up with information on the obd2. Any help would be appreciated. Thanks!

Tippa

I dont remember, where i picker those pics from. Anyways i think that Pins are wrongly named at pinout, sorry about that.

Pins with right names (u need to connect only these):
14 Battery power
15 ISO 9141-2 L Line
19 GND
20 ISO 9141-2 K Line

I desided to buy hardware and use carsoft 6.5 software, whits was recommended in local bmw forum. It is a lot easier and safer that way. I will report, if get it working some day (this could take some time/ have a lot of things to do).

Live info from e36 (see pics, text in finnish ):
http://www.btcf.fi/forum/showpost.ph...&postcount=558

About carsoft:
http://www.carsoftinternational.com/bmwpackage.htm

Cables + converter:
http://www.one-stop-factory.com/prod...ble+Interfaces
http://www.diagtech.de/index.php/cat...Interface.html
http://itrademarket.com/uifltd/250425
(make sure that it is carsoft 6.5 compatiple)

UKOBD

Hi,

Its also important to remember that many OBD2 scanners will only retrieve generic codes (P0 codes).

If you want to retrieve P1 codes you will need a factory code scanner like the Peake or Carsoft. We became UK distributor for Peake Research for this very reason. The Peake tool supports most petrol BMW's from 1987 - 2003.

Hope that this helps.

Gareth

Gareth Roberts
UKOBD

uberwerkz

UKOBD - can you use your software in a carputer? any screenshots?

shoulders

BMWs from 1996 in US are all OBDii compliant. It is the law.
Some european BMWs are obdii compliant from about the same time, it was not made law here until 2001, but some cars obviously will have the same ECU.

The quick way to see if your car is OBDii compliant is to see in the 20 pin DLC if pin 17 is present (the second K line) this is only used for OBD. or the presence of an OBD socket under the steering wheel.

Dont get confused with TX and RX lines. Line 20 is the K line carsoft and bmw use to talk to the car, this is based on ISO 9141-2 and is a half duplex line.
Pin 15 is only used to wake up the ECUs on old cars, that is all. (the L line).

I have used an ELM 323 for my car to get OBD info, this is not as good as carsoft. the ELM 327 does all protocols for OBDii.

BMW have moved towards CAN , but i have been told you can still access the car via a KL interface because there is a K line to CAN converter. This does need to be checked. A guy who works on BMWs all day long told me this.

UKOBD

Hi uberwerkz,

In response to a few of the posts - BMW's post 2001 in the UK (petrol models) are compatible with generic scantools (which can be connected to a carputer - however we recommend that a relay is fitted, or 12v sourced from the ignition circuit so that OBD unit is not on all the time, and therefore a drain on the battery) - this will allow you to view real time data, etc. using a tool such as the mOBYdic - which we are UK distributor for, we pair this with the Digimoto software (screenshots: http://www.digimoto.com/demo.htm).

It is important to note however that these tools will only give access to the generic P0, not manufacturer specific P1 codes, and therefore is important to buy based on what you are looking to get from the tool.

Hope that this helps.

Gareth
UKOBD

masch

Tippa, will that work with 1993 E36?

Is there any computer-based scanner for non-OBDII?

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UKOBD

Hi masch,

The only non-OBDII computer-based tools will be part of a professional package. This will be tools such as the Carsoft tool, which may be appropriate depending on your budget.

Hope that this helps.

Gareth
UKOBD

headworks

I have been looking at both Peake, and ELM327 diagnostics.
BMW 523i 1998 Touring (UK model)
I have now purchased a ELM327 with USB and ISO, plus a convertor lead to connect to BMW 20 pin under the hood socket. This box claims to be able to read BMW using a variety of software, I found Digimoto to be useful, as it has a direct serial send command box.
Usig this you can send commands to the chip, and to the diagnostics port.
So I configured the ELM using command:
AT SP3 S(et) P(rotocol) to 3 (ISO 9141/2)
I then sent a simple coolant temperature command:
01 05
An ELM327 shuts down and disconnects (I suspect either brown-out or over power shut down)
Most commands are available in ELM327DS.pdf, which you can get all over the place, just Google it, and protocol information is in a spreadsheet:
http://www.etools.org/files/public/g...s-02-17-03.htm
I am attempting to diagnose why this shutdown occurs, as it should be simple enough to re-wire, use resistors etc to prevent.
As soon as I know I will post here, unless any of you have a suggestion.
However advantage of LM327 over peake is (in my case) BMW diagnostics suggest Cam sensor and Mass air flow are defective, I have had both of these changed, but as soon as the motor is well warmed up it is terrifying at up hill pull off, it more or less completely lacks power.
So solution is to run continual monitoring and watch for the change as the motor gets hot. Peake will not allow me to do this.
I am considering a chip set compatible with Carsoft, if this doesn't work.