? for 96 guys using ODB1 94-95 computers
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Joined: Nov 2005
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From: Bardstown Kentucky
? for 96 guys using ODB1 94-95 computers
Ever since I put the ODB1 computer in my car I have been getting the SYS on the dash. The computer I have is out of a Camaro. I thought that if I put the ODB1 Vette computer in, it would cure the problem. I have heard both ways, that the vette and camaro computers are the same and that they are not. So what do I need to do, change the CCM to the older 94-95?
Melting Slicks
Joined: Jan 2002
Posts: 2,784
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From: Atlanta GA
Ever since I put the ODB1 computer in my car I have been getting the SYS on the dash. The computer I have is out of a Camaro. I thought that if I put the ODB1 Vette computer in, it would cure the problem. I have heard both ways, that the vette and camaro computers are the same and that they are not. So what do I need to do, change the CCM to the older 94-95?
A)Change your knock sensors to units from a 94-95
or
B)Open up your PCM and solder in a resistor so you dont need to change out knock sensors. There is a write up on this somewhere. Ill post a link if/when I come across it
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Joined: Nov 2005
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From: Bardstown Kentucky
I ordered this ecm from PCM for less a year ago and paid to have the mod done to make it work in my car...resistors soldered in...aparently. I took it apart but cant find where anything had been done. I am going to try to load a factory Vette .bin into it tonight and see what happens.
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From: Bardstown Kentucky
No go, the car is still flashing SYS. I loaded 2 factory 95 Vette bins and a factory Fbody .bin, it was still there. I put the factory ECM in and it goes away.
Did you find the link to the knock sensor mod in the ECM?
Edit
I just found this
"All you need to do is get a 2K ohm resistor at radio shack (for like 47 cents instead).
Once you've done that, you can bridge 21-22 in the blue connector, then connect one side
of them to the resistor. Connect the other side of the resistor to ground (Pin 1 in blue) and you're good to go."
I know mine does not have any resistors soldered in like mention above.
Did you find the link to the knock sensor mod in the ECM?
Edit
I just found this
"All you need to do is get a 2K ohm resistor at radio shack (for like 47 cents instead).
Once you've done that, you can bridge 21-22 in the blue connector, then connect one side
of them to the resistor. Connect the other side of the resistor to ground (Pin 1 in blue) and you're good to go."
I know mine does not have any resistors soldered in like mention above.
Last edited by 96lt4c4; Jun 4, 2008 at 07:42 AM.
Melting Slicks
Joined: Jan 2002
Posts: 2,784
Likes: 3
From: Atlanta GA
No go, the car is still flashing SYS. I loaded 2 factory 95 Vette bins and a factory Fbody .bin, it was still there. I put the factory ECM in and it goes away.
Did you find the link to the knock sensor mod in the ECM?
Edit
I just found this
"All you need to do is get a 2K ohm resistor at radio shack (for like 47 cents instead).
Once you've done that, you can bridge 21-22 in the blue connector, then connect one side
of them to the resistor. Connect the other side of the resistor to ground (Pin 1 in blue) and you're good to go."
I know mine does not have any resistors soldered in like mention above.
Did you find the link to the knock sensor mod in the ECM?
Edit
I just found this
"All you need to do is get a 2K ohm resistor at radio shack (for like 47 cents instead).
Once you've done that, you can bridge 21-22 in the blue connector, then connect one side
of them to the resistor. Connect the other side of the resistor to ground (Pin 1 in blue) and you're good to go."
I know mine does not have any resistors soldered in like mention above.
http://www.camaroz28.com/forums/show...older+resistor
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Joined: Nov 2005
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From: Bardstown Kentucky
I havent had time to pull the code since I am out of town. I will try to do it tonight when I get home. The only thing is I thought the knock sensors would throw the SES on and not the SYS.
Safety Car
Joined: Apr 2003
Posts: 3,793
Likes: 9
From: VA
That is correct, which is why I wanted you to think about that before hacking on your PCM...
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From: Bardstown Kentucky
Thread Starter
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Joined: Nov 2005
Posts: 536
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From: Bardstown Kentucky
CCM DTC code 81 is, Invalid Vehicle Configuration Detection ( engine types do not match ). This is coming from the Camaro ECM.
I have loaded Vette .bins into this thing and I am still getting the SYS. Even after reflashing the ECM it still shows up as a Camaro Vin# with an LT1 in the Winflash program. Anybody know how to change this info? It doesnt seem to be changed by reflashing.
I have loaded Vette .bins into this thing and I am still getting the SYS. Even after reflashing the ECM it still shows up as a Camaro Vin# with an LT1 in the Winflash program. Anybody know how to change this info? It doesnt seem to be changed by reflashing.
Melting Slicks
Joined: Jun 1999
Posts: 2,949
Likes: 23
From: Bowling Green KY
My 96 with 95 PCM does the same thing. I don't think you can get rid of the CCM code. I went so far as to put a Vette PCM in instead of the Camaro PCM that was originally in my car when I got it and still no dice.
The 96 CCM is looking for a 96 PCM, so anything other than a 96 CCM is gonna throw the C81 I think. I don't know all the nuances of this but I've just lived with it, switching out the CCM is a complete PAIN so I would just live with the blink.
It doesn't matter which .bin style you use.
The 96 CCM is looking for a 96 PCM, so anything other than a 96 CCM is gonna throw the C81 I think. I don't know all the nuances of this but I've just lived with it, switching out the CCM is a complete PAIN so I would just live with the blink.
It doesn't matter which .bin style you use.
Last edited by DVNCI; Jun 27, 2008 at 10:58 PM.
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Joined: Nov 2005
Posts: 536
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From: Bardstown Kentucky
My 96 with 95 PCM does the same thing. I don't think you can get rid of the CCM code. I went so far as to put a Vette PCM in instead of the Camaro PCM that was originally in my car when I got it and still no dice.
The 96 CCM is looking for a 96 PCM, so anything other than a 96 CCM is gonna throw the C81 I think. I don't know all the nuances of this but I've just lived with it, switching out the CCM is a complete PAIN so I would just live with the blink.
It doesn't matter which .bin style you use.
The 96 CCM is looking for a 96 PCM, so anything other than a 96 CCM is gonna throw the C81 I think. I don't know all the nuances of this but I've just lived with it, switching out the CCM is a complete PAIN so I would just live with the blink.
It doesn't matter which .bin style you use.
Melting Slicks
Joined: Jun 1999
Posts: 2,949
Likes: 23
From: Bowling Green KY
I think if you could change all the info like engine type, vin number, etc... to match the original PCM it would work. Even though the factory PCM is ODB2 I can read the factory vin and engine code with my winflash program. If I could copy that into the 95 PCM I bet it would work. I dont have that capability.