LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

anyone that has done an OBD 1 conversion

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Old May 24, 2005 | 06:32 PM
  #1  
SickWS6's Avatar
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From: Loveland colorado
anyone that has done an OBD 1 conversion

i am working on doing this to my 96 and i need the pinouts that show where each wire goes i have akll the other stuff so if you guys could give me some advice that would be great.
Old May 24, 2005 | 07:09 PM
  #2  
truedualws6's Avatar
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From: Downey, CA
Re: anyone that has done an OBD 1 conversion

I'm not sure what you are asking for. All you need is a knock sensor and
to have your ODBI PCM tuned appropriately. The rest is plug and play.
Old May 24, 2005 | 07:42 PM
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Re: anyone that has done an OBD 1 conversion

Resistors can be soldered into the PCM so it can work with the OBD2 knock sensor. This is what I did, all i have to do to go back to obd2 is unplug the computer and plug the other one in. I dont remeber what pins i had to solder, do a search and it should come up.

Last edited by jchevy; May 24, 2005 at 08:33 PM.
Old May 24, 2005 | 08:28 PM
  #4  
Brent94Z's Avatar
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Re: anyone that has done an OBD 1 conversion

If you are trying to get the pinouts for the connectors, it sounds like you are trying to do something you don't need to do. I have a 96 OBDI conversion and my car is like jchevy's... my OBDI PCM has been modified via a resistor to accept the OBDII knock sensor. If I want to switch between the OBDI and OBDII PCMs all I have to do is unplug one and plug in the other... nothing else.
Old May 26, 2005 | 03:10 PM
  #5  
SickWS6's Avatar
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From: Loveland colorado
Re: anyone that has done an OBD 1 conversion

Will the knock module out of an OBD2 Pcm work on an OBD1 PCM if i just swap them or does more need to be done
Old May 26, 2005 | 04:31 PM
  #6  
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Re: anyone that has done an OBD 1 conversion

Sensor itself reads a different resistance so resistors need to be soldered in to convert it to what the PCM is looking for. Do a search and info will come up on what you need to do.
Old May 26, 2005 | 06:47 PM
  #7  
97Z-M6's Avatar
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From: near waco tx.
Re: anyone that has done an OBD 1 conversion

here you go just follow this i did it its no big thing.

http://web.camaross.com/forums/showt...rsion+resistor
Old May 26, 2005 | 10:19 PM
  #8  
cpope's Avatar
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From: Denison, TX
Re: anyone that has done an OBD 1 conversion

Computer pinouts: http://shbox.com/1/4th_gen_tech2.html#1995_pcm_pinouts

shoebox is the man. I could not have done the lt1-s10 swap without him.
Old May 26, 2005 | 10:34 PM
  #9  
SickWS6's Avatar
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From: Loveland colorado
Re: anyone that has done an OBD 1 conversion

The PCM that i have has no Knock Module in it so if i swap the knock mudule from the OBD2 PCM to the OBD1 which i am putting in. will that be fine?
i have already soldered in the resistor. so i think thats all that i need is just the knock module
Old May 27, 2005 | 02:01 PM
  #10  
Brent94Z's Avatar
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Re: anyone that has done an OBD 1 conversion

Originally Posted by SickWS6
Will the knock module out of an OBD2 Pcm work on an OBD1 PCM if i just swap them or does more need to be done
An OBDII knock module will work in an OBDI PCM. However, and OBDII knock SENSOR will not work in an OBDI car.

I have used an OBDII knock module (LT4) in my OBDI PCM with no problems as have several others.
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