Scantool OBD-1. Time for an update for 993 ?
06-03-2020, 03:12 AM
#1
Instructor
Thread Starter
Scantool OBD-1. Time for an update for 993 ?
Hi,
I have spent some times over the past few years looking into OBD-I protocol since my car is a 1995 993C4..
I initially used Scantool to get an idea but it is not 100% compatible with my 993. It nevertheless gave me some info about the communication protocol.
I then wrote my own software to communicate with various modules (mainly CCU).
Few people on here have done same, but seems to have left Rennlist with their knowledge.
This is an unfinished project i would like to complete.
Currently, my software can (tested against H08 CCU since it is on my bench)
- read system & serial number
- read & clear error codes
- control outputs (drive links) (flaps/fans)
- read Inputs Signals , flaps position & CCU button position (AC, AC max, defrost. recirculation)
- Can't read yet Actual Values, e.g. temperatures
My software can also sniff and log the data assuming a spy cable is available.
One way to go about moving this project forward, it is used a Porsche diagnostic tool, and sniff the data being exchange between tester and car modules.
But, i don't have access to any of those tools. This is where i need help.
Anybody would like to contribute ?
I have spent some times over the past few years looking into OBD-I protocol since my car is a 1995 993C4..
I initially used Scantool to get an idea but it is not 100% compatible with my 993. It nevertheless gave me some info about the communication protocol.
I then wrote my own software to communicate with various modules (mainly CCU).
Few people on here have done same, but seems to have left Rennlist with their knowledge.
This is an unfinished project i would like to complete.
Currently, my software can (tested against H08 CCU since it is on my bench)
- read system & serial number
- read & clear error codes
- control outputs (drive links) (flaps/fans)
- read Inputs Signals , flaps position & CCU button position (AC, AC max, defrost. recirculation)
- Can't read yet Actual Values, e.g. temperatures
My software can also sniff and log the data assuming a spy cable is available.
One way to go about moving this project forward, it is used a Porsche diagnostic tool, and sniff the data being exchange between tester and car modules.
But, i don't have access to any of those tools. This is where i need help.
Anybody would like to contribute ?
