Diagnostic Interfaces

[Rhinoman]

Originally Posted by jtgh

that is exactly it.
how do you get the male end.? (pretty obscure parts)

thank you ,

I had no luck on the net trying to find a source of the male ALDL connector. I bought some OBD2 connectors about 18months ago so I sent the guy an email asking if he had any. He has come back to me saying yes so I'm waiting for the quote. He's also offered an OBD2 to ALDL converter so I might opt for that instead as I've already designed an interface that fits into the OBD2 connector. I've asked for details on the wiring of the converter.

[Rhinoman]

Just to complicate things further. The Suzuki FSM shows the diagnostic connector to be male, so there are at least 3 different connectors.

[jtgh]

and adaptor is cool, so long as its off shelf? wish i could find one.


as long as I dont have to make one out of paper clips and wire.....
LOL.?

cheers.

[Rhinoman]

Hi Jerry
How's it progressing? I've done a bit of work on my PC software, got it to build and fixed the spark table stuff. I've still got to do the serial link stuff and fuel tables but that shouldn't be too difficult - the scanner will do all the hard work. I've given it a new look, what do you think?



I'll create a few more custom components for the end version and tidy it up a bit. I've decided to colour code some of the text so water temp will be blue when cold, black when normal operating temp and red when too hot. I'll put some numbers on the gauges too. The programmer part is for my ECU and will be disabled for non-programmable ECUs.
Source code is in the usual place.

[jtgh]

been pounding on my blasted server, its going again.

that really looks cool.

im working on my raw logger. in linear c++ ,
want to see what else I can smoke out of this ECU. (on live engine running , no more bench )

that is wierd about showing male, I will check mine more carefully.
if have a spare , conn. assembly and will trace there wires, but im pretty sure the mail is RWAL and female is DTC2 ECU comms.

thanks for all !!!

cheers

[Rhinoman]

I have my diagnostic scanner working with the output looped back and I have my virtual dashboard working with the serial link simulated. I'm now trying to get all the formulae exact before I get the graphical logger working.
have you got MAP Sensor voltage vs pressure readings? I have put the values in the FSM into EXCEL and created a trend line but the FSM doesn't give values below 526mmHg or above 660mmHg so it may not be particularly accurate.

graphical Logger so far:

[jtgh]

i can do that,
here is what i have now.

here it is:
http://carfix.stufftoread.com/map-data.GIF

526 = 10000 feet. altitude.

note the .7v , uncertainty of each sensor. (crude bugger)
id just plot the center point.

if you need real measured data . I can give it.
it is set up 1 meter to might right with vacuum pump and all .


that is really gorgous work, very spiffy we say.

thanks for all.

cheers, jerry

[Rhinoman]

Hi Jerry
Can you take a couple of measurements at 100mmHg and 250mmHg please? at 5.0V or as close as possible. Those values look the same as the ones that I have, if you plot them they don't form an exact straight line so there must be some rounding up/conversion errors in there.
The Baro sensor is actually very accurate, the measurement uncertainty is because the output varies with the supply voltage. The quoted supply voltage is 4.75-5.25V, hence the big range of output voltage. With any test specifications you also have to allow for inaccuracies in the measuring equipment.

[Rhinoman]

I got this from your web page:
Typical value = 39 kPa / 1.56v
If I put that into my Excel spreadsheet then that extends the line nicely. This gives me the formula:
MAP(kPa) = ((0.4896* A/D value)-0.6427).

That comes out pretty close to 0.5*A/D value which is most likely to be correct.

[jtgh]

I will validate that tonight.

thanks for the equation, and corelations !!!