1995 OBD1 Diag tool
05-30-2006, 01:35 PM
#48
Instructor
Originally Posted by tj90
Why do I only see 4 red wires out of the box, when the schematic is calling for 5?
05-30-2006, 01:39 PM
#49
Three Wheelin'
Ahhh......thanks for the clarification.
Im going to Frys today to start fabbing a breadboard. Reminds me of my high-school days and playing around with electronic project hobby books....
Im going to Frys today to start fabbing a breadboard. Reminds me of my high-school days and playing around with electronic project hobby books....
05-30-2006, 04:16 PM
#51
Hey TJ90 if you are succesfull I would like to drop by and see how it works if you don't mind. I'm in Escondido and own a 95 and am very interested on how this all pans out!
Alex
Alex
05-31-2006, 01:18 AM
#52
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Originally Posted by geldgrube
Hi Ray,
this is a great post! I have a '95 993 and I've built your ciruit. I'm able to get status back on the pin 3 K line (climate control, ABS etc) but I'm not getting a response from the DME when I switch it over to the K line on pin 7. It never connects.
This tells me that everything in the circuit is working and the software is talking to COM1 ok etc etc. One thing I have noticed is that when I measure pin 7 of the OBD connector (I have the OBDII style on my car) without your circuit connected, it only measures around 6 volts and doesn't change (I've scoped it).
Is 6 volts normal for line 7 with nothing connected??
Thanks in advance......great job by the way!
Cheers,
Ron
this is a great post! I have a '95 993 and I've built your ciruit. I'm able to get status back on the pin 3 K line (climate control, ABS etc) but I'm not getting a response from the DME when I switch it over to the K line on pin 7. It never connects.
This tells me that everything in the circuit is working and the software is talking to COM1 ok etc etc. One thing I have noticed is that when I measure pin 7 of the OBD connector (I have the OBDII style on my car) without your circuit connected, it only measures around 6 volts and doesn't change (I've scoped it).
Is 6 volts normal for line 7 with nothing connected??
Thanks in advance......great job by the way!
Cheers,
Ron
DME responds on pin 7 at 9600 baud. Check both jumpers are correct.
Pin 7 is bidirectional. I haven't looked at level without interface connected.
With interfaqce connected it is ~+12V and ~0V. 6 volt makes sense since interface circuit provides pullup resistor to +12V.
Check scantool.cfg for Motronic address 16 and baud 9600.
Guessing: You can talk with all but Motronic. Then Motronic is either not
using 16/9600 or not working on OBD. You can ohm out connection to 7 & 15.
Try, with scope. Turn on ignition. Bring up Scantool. Motronic selected and jumpers correct. Look at pin 15 for 5 baud address. Look at pin 7 for data. I believe it is 200us minimum bit size for 9600.
Pin 7 different than 200us. then change baud rate to correspond.
Nothing on pin 7. Try addresses from 10 to 20. Look at pin 7 for each.
Ray
PS: I'm better at doing than explaining, problems just ask again.
05-31-2006, 01:31 AM
#53
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Originally Posted by hidden
My question is where do we get the OBD connector? I have electronics knowledge so that isn't a problem. In fact I've built three Wide Band O2 sensor controllers from nothing.
Anyways I'm interested in building the circuit just need to find the connector.
Thanks.
Anyways I'm interested in building the circuit just need to find the connector.
Thanks.
I used a 6 inch cable with male pins on one end and a connector on the other end. Pushed the pins into the OBD connector. I chose a ribbon cable connector
for the other end of this 6 inch cable. This cable fits behind the plastic OBD
cover.
To connect interface, I remove plastic cover, pull out ribbon connector, plug
into a ribbon cable, the other end of the ribbon cable is plugged into interface.
Or you could buy an OBD connector. But I didn't spend a cent. :-)
Ray
05-31-2006, 01:36 AM
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Originally Posted by PCar SBA
The Bosch KTS 300 tools are not too hard to find. If anyone is interested in upgrading his Bosch KTS300 to the Porsche Version 9288/8.1 making it a real "Hammer" let me know. See here for how one works. http://forums.pelicanparts.com/showt...hreadid=282401
Cheers,
Ingo
Cheers,
Ingo
Could you take jpg of the actual values, etc and publish? Or email me.
I need to know what the DME responses look like. The shop manual is not
very informative. (to me)
Ray
05-31-2006, 01:46 AM
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Originally Posted by cowtown
For testing, yes, I put the leads directly into the plug. They aren't bare wires though- I soldered a piece of component lead onto each tip so it gets a good connection.
I have the OBD plug on order but couldn't wait to turn off that @!#$# airbag light. Replacing the clock caused the trouble code in the first place.
Now another question - It looks like I have the OBDII connector, even though I have an early early '95. What's going on here?
I have the OBD plug on order but couldn't wait to turn off that @!#$# airbag light. Replacing the clock caused the trouble code in the first place.
Now another question - It looks like I have the OBDII connector, even though I have an early early '95. What's going on here?
1996. 1995 round or 'rectangular OBD2' have the same interface.
The connector changed.
And the location of the connector changed. Again required for 1996.
I have the OBD2 style. It seems most 1995 are OBD2 style.
Ray
05-31-2006, 02:20 AM
#56
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Originally Posted by raycm
Could you take jpg of the actual values, etc and publish? Or email me.
I need to know what the DME responses look like.
I need to know what the DME responses look like.
What values are you looking for?
05-31-2006, 02:25 AM
#57
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I have not selected the Test Outputs button.
I did select Adaption for DME and published the result.
I did not select anything in that window.
I don't want to break my working auto. Trip Airbag, reprogram idle, or whatever.
Ray
I did select Adaption for DME and published the result.
I did not select anything in that window.
I don't want to break my working auto. Trip Airbag, reprogram idle, or whatever.
Ray
05-31-2006, 03:51 AM
#58
Instructor
Originally Posted by raycm
...I did select Adaption for DME and published the result... Ray
ingo
05-31-2006, 10:01 PM
#59
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Originally Posted by raycm
DME is pin 7. DME is woke up on pin 15. 5 Baud address on pin 15 and
DME responds on pin 7 at 9600 baud. Check both jumpers are correct.
Pin 7 is bidirectional. I haven't looked at level without interface connected.
With interfaqce connected it is ~+12V and ~0V. 6 volt makes sense since interface circuit provides pullup resistor to +12V.
Check scantool.cfg for Motronic address 16 and baud 9600.
Guessing: You can talk with all but Motronic. Then Motronic is either not
using 16/9600 or not working on OBD. You can ohm out connection to 7 & 15.
Try, with scope. Turn on ignition. Bring up Scantool. Motronic selected and jumpers correct. Look at pin 15 for 5 baud address. Look at pin 7 for data. I believe it is 200us minimum bit size for 9600.
Pin 7 different than 200us. then change baud rate to correspond.
Nothing on pin 7. Try addresses from 10 to 20. Look at pin 7 for each.
Ray
PS: I'm better at doing than explaining, problems just ask again.
DME responds on pin 7 at 9600 baud. Check both jumpers are correct.
Pin 7 is bidirectional. I haven't looked at level without interface connected.
With interfaqce connected it is ~+12V and ~0V. 6 volt makes sense since interface circuit provides pullup resistor to +12V.
Check scantool.cfg for Motronic address 16 and baud 9600.
Guessing: You can talk with all but Motronic. Then Motronic is either not
using 16/9600 or not working on OBD. You can ohm out connection to 7 & 15.
Try, with scope. Turn on ignition. Bring up Scantool. Motronic selected and jumpers correct. Look at pin 15 for 5 baud address. Look at pin 7 for data. I believe it is 200us minimum bit size for 9600.
Pin 7 different than 200us. then change baud rate to correspond.
Nothing on pin 7. Try addresses from 10 to 20. Look at pin 7 for each.
Ray
PS: I'm better at doing than explaining, problems just ask again.
I've checked the 5 Baud address on pin 15 and it's ok. I've tried changing the Motronic address in config file from 10 right through to 30 but I'm stll getting a constant +12v on pin 7 with absolutely no change (I have a scope atteched). My next step will be to check continuity between the OBD connector pin 7 and the DME under the seat but after that, I'm running out of things to try. Any more suggestions?
Thanks,
Ron
06-01-2006, 01:02 AM
#60
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Originally Posted by PCar SBA
I am confused. I was under the impression that scantool DOES NOT support system adaptation. What adaptation did you select?
ingo
ingo
shell is displayed. See attached.
Ray
Last edited by raycm; 08-20-2006 at 05:29 PM. Reason: my attach file limit.