there are no kia documents. for this. zero
the only way , lacking that.
is to rent a working scan tool
then scope the pins, while using this tool. to see all signalling , going on at the DLC.
there is no other way, besides blind luck,
you have to guess. ?
what pins?
what levels on all pins? or even if the signals are INVERTED !
what signaling rate (baud)
what hand shake (pins, or delays or both)?
then the command sets.? (and its unknown constructs, even embedded check sum codes, or worse, CRC codes)
then the response meanings , scalings.. OBD1 is not scaled in , physics, like pressure , temperature, , its done in volts. (and you need the scaling rules)
impossible..... to guess all that, at one time.
why try?
rent at tool and see what the real tool does. there is no other way
besides pulling the code out of the ECU and reverse engineering all that (a man years work)
you are trying the impossible, many have and may failed.
i do hope im wrong, but .... .facts are facts.
the answer is not here, we dont even have this car here.
if there is and answer, its most likely on a Korean forum.... in there language or close Japanese)
your device is a typical serial. bi-direction interface.
i see you run the LM339 on 12 to 15vdc (vcc is ok at 12) but not pin 14.
that can damage many ECU. on its receive lines.
you need to limit that so the drive (339>ecu p14) signal can not exceed TTL VOH, 4v.
the 339 outputs are open drain.
R2 is the pull up to 12-15v. that is unsafe.
the pull up needs to go to 5v. max.
id not exceed , TTL levels into any ECU (comm ports)
here is the old year 2000?
device that runs our ECU, here.
note how the drive can not exceed 5v. via a 10,000 ohm resistor (this is for very very old laptops. with real R232 ports , now gone byebye)
http://www.fixkick.com/hacking/hacked/ALDL-JTGH1.jpg
most pins on a typical ECU are input protected with large series resistors.
but not all.
and on the COMM lines, i bet not. seen many that are not protected from shorts to battery in car, 12-15v....
its only to be connected to a computer.
using TTL rules.
No even protected from REAL EIA- RS232 (-12 and +12v signal swings as see on main frame computers. and IBM PC from 1981 to about year 2000 when these ports were deleted. These levels were for MODEMS and terminals and printers only then)
and are good,(USB now or wireless)
The reason they (kia) used TTL232 is because they can buy dirt cheap UARTS that work. then they add custom level drivers . all unique to KIA,and all SECRET.
the only way , lacking that.
is to rent a working scan tool
then scope the pins, while using this tool. to see all signalling , going on at the DLC.
there is no other way, besides blind luck,
you have to guess. ?
what pins?
what levels on all pins? or even if the signals are INVERTED !
what signaling rate (baud)
what hand shake (pins, or delays or both)?
then the command sets.? (and its unknown constructs, even embedded check sum codes, or worse, CRC codes)
then the response meanings , scalings.. OBD1 is not scaled in , physics, like pressure , temperature, , its done in volts. (and you need the scaling rules)
impossible..... to guess all that, at one time.
why try?
rent at tool and see what the real tool does. there is no other way
besides pulling the code out of the ECU and reverse engineering all that (a man years work)
you are trying the impossible, many have and may failed.
i do hope im wrong, but .... .facts are facts.
the answer is not here, we dont even have this car here.
if there is and answer, its most likely on a Korean forum.... in there language or close Japanese)
your device is a typical serial. bi-direction interface.
i see you run the LM339 on 12 to 15vdc (vcc is ok at 12) but not pin 14.
that can damage many ECU. on its receive lines.
you need to limit that so the drive (339>ecu p14) signal can not exceed TTL VOH, 4v.
the 339 outputs are open drain.
R2 is the pull up to 12-15v. that is unsafe.
the pull up needs to go to 5v. max.
id not exceed , TTL levels into any ECU (comm ports)
here is the old year 2000?
device that runs our ECU, here.
note how the drive can not exceed 5v. via a 10,000 ohm resistor (this is for very very old laptops. with real R232 ports , now gone byebye)
http://www.fixkick.com/hacking/hacked/ALDL-JTGH1.jpg
most pins on a typical ECU are input protected with large series resistors.
but not all.
and on the COMM lines, i bet not. seen many that are not protected from shorts to battery in car, 12-15v....
its only to be connected to a computer.
using TTL rules.
No even protected from REAL EIA- RS232 (-12 and +12v signal swings as see on main frame computers. and IBM PC from 1981 to about year 2000 when these ports were deleted. These levels were for MODEMS and terminals and printers only then)
and are good,(USB now or wireless)
The reason they (kia) used TTL232 is because they can buy dirt cheap UARTS that work. then they add custom level drivers . all unique to KIA,and all SECRET.
http://www.fixkick.com