WinALDL

Hi there:

Wondering if anyone has had experience with WinALDL?

Specifically, has anyone built the cable that it uses?

My question is When I connect the cable to my laptop, I get a negtive voltage on the wires that go to the ALDL connector. This is when the software is not running, when it is running voltage is 0 where it should be. Can anyone confirm if this is correct?

Thanks

-paul

i don't think anyone knows what you are talking about...is this something to do with a code reader for a laptop or something?

No, but if you get it to work on your 1992, let us know. I've wanted to read the engine running parameters for a long time now. There is a lot of useful information like engine speed, short term/long term fuel trim, intake air & coolant temperatures, open/closed loop, oxygen sensor status, Etc.

Do you have the 3-pin ALDL connector on your Rodeo like I do?

If I had a 1996, this wouldn't be a problem as OBD II came into use at that time and scan tools for them are plentiful.


Dale

P.S.- Have you looked at this?

http://winaldl.joby.se/aldlcable.htm

Hey there:

The site you pointed out is where I got the schematic from, I've compared it to others, most are just like this one. I've written to the author of the schematic, but as of yet no word.

The 1991, 92 rodeos use ODB1, I'm pretty sure right up to 1997, at least according to Haynes (which I can't stand).

The 93 and above engines use whats called the 8192 circuit, it is bi directional and require a little more circuitry to communicate with the ECM. The 1991, 92 ecm use the 160 circuit which is not bi-directional, it just feeds the interface. The interface in turn converts the single into an modulated signal which can be read by the serial port on a computer. I should also add that the 160 data signal is on pin E of the ALDL connector, its located 5 pins or sockets (since there is not many pins) across from the ground, in the 8192 circuit, the data signal pin is directly under the ground on pin M.

When I run the winaldl software the wires that connect to the ALDL are at zero volts. is would expect that, but when the software is off, that worries me, especially if something goes wrong with the laptop during a trip. Perhaps I should install a diode, just to be safe. The problem with that is perhaps the negitive voltage is what is needed to provide some of the modulations. I'm just not sure.

No, but if you get it to work on your 1992, let us know. I've wanted to read the engine running parameters for a long time now. There is a lot of useful information like engine speed, short term/long term fuel trim, intake air & coolant temperatures, open/closed loop, oxygen sensor status, Etc.

Do you have the 3-pin ALDL connector on your Rodeo like I do?

If I had a 1996, this wouldn't be a problem as OBD II came into use at that time and scan tools for them are plentiful.


Dale

P.S.- Have you looked at this?

http://winaldl.joby.se/aldlcable.htm

Hey there:

WHat kind of ALDL conector do you have? Is it a three prong thing or 12 position with only three connectors?

Hey there:

Just incase anyone cares. There should not be any voltage on the ALDL wires when connected to the serial port of a computer.

I found this after visiting this site

http://www.euronet.nl/users/fo_elmo/aldlinterface.htm

There is a similar circuit there which has a test, my results from that test, were odd, but I got it to work. Anyway after re-examining my work, I was still trying to figure out where to put the diode, I realized that I had gotten the pin reversed. Yeah, I do know what I'm doing, sometimes I even scare myself!!!

Anyway, the circuit there uses different components but the same wiring schematic, what I liked about it was an LED hooked up to the data line, this way you know if the ECM is transmitting. Anyway I made my changes and now there is no voltage on the wire when the computer is running. Sometiimes it pays to double and then triple and then wait a few days and check again.

I hope to try this on monday, tomorrow is a busy day!

-paul

The ALDL connector on the 1995.5 Rodeo has 3 pins only. There is no provision for 12 pins. I believe I've read somewhere that they call it an "Isuzu / Delco" ALDL connector.

Good to hear you are making progress on the hardware interface, but how do you know that once you receive the serial data stream that the computer will make heads or tails of it?

I don't see the Isuzu 3.2L in the list of supported vehicles:
http://winaldl.joby.se/aldldata.htm


Still interested,
Dale

I've been doing some checking, Yeah the Haynes dont go over this real well. All they show is a diagram of the connector and which pins to jumper to read codes. But there is something out there. Vetronix has a device that will read your performance, so its not impossible.

To answer your question, I'm not really sure, I have looked for my engine compatiblity and found it even though the list says nothing about Isuzu, I know I have an LG6 GM engine.

I read that Delco separated from GM and makes ECM for other manufactures, like Isuzu. I think I've even found a site that will read any ECM.

http://www.blacky.co.nz/efilive/

Go under freestuff and you will see carbytes, they say they can read any ECM.

Anyway, you would need to build or buy the 2 transistor interface because (I believe) yours uses the 8192 baud rate, which is bi-directional.

Now all this is speculative. To know more, you should be referencing the workshop manual put out by Isuzu, not a Chiltons, or a Haynes. I bought the manual for my vechile and year, you may have to do the same to see if pin 2 is actually the data pin. My guess and its only a guess is that it is, but its not my car and I wouldn't bet with a guy on the net that he's right unless there is documentation to back it up, and I have none, just a few disconnected facts.

Hope I didn't totally confuse you, I will continue to check around, but really in order to continue I need the pinout of that ALDL connector, just to confirm that its possible!

-paul