Lt1 ECU
Thread Starter
6th Gear
Joined: Nov 2002
Posts: 6
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From: Albany NY
Lt1 ECU
I currently drive an Lt1 camaro, and have been put under the impression that lt1 fbodies and lt1 vettes use the same ECU aside from a few minor differences (which I dont know what they are) and I've been working like a geek to add stupid nonsense to my car (Like an auto-dimming rear mirror with compass and temp display that can be found in newer GMs)
But now I'd like to be able to get a trip computer, and after getting spoiled rotten by my 98' GTP Grand Prix, I noticed the vettes had one. Does anyone have the knowledge to where those signals are sent from and to? Does the ECU do the computing and send them to the dash? Is it the dash that does it? Why does the trip computer module have that huge black section? I'm hoping to get this donw by spring. It's a stupid project, and not worth the $$$ to do it, but hey, it'd be neat to have. I have the "GM Big Book" on 95' Lt1 Camaros coming to me, but for now I just have the Haynes and Chiltons for another week. So, please let me know!
Thanks again! :steering:
But now I'd like to be able to get a trip computer, and after getting spoiled rotten by my 98' GTP Grand Prix, I noticed the vettes had one. Does anyone have the knowledge to where those signals are sent from and to? Does the ECU do the computing and send them to the dash? Is it the dash that does it? Why does the trip computer module have that huge black section? I'm hoping to get this donw by spring. It's a stupid project, and not worth the $$$ to do it, but hey, it'd be neat to have. I have the "GM Big Book" on 95' Lt1 Camaros coming to me, but for now I just have the Haynes and Chiltons for another week. So, please let me know!
Thanks again! :steering:
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Joined: Apr 2002
Posts: 69
Likes: 0
From: Deerfield Beach FL
Re: Lt1 ECU (The Spaz)
The LT1 PCMs for Y and F body are indeed similar, but they are different. The Y body has a Central Control Module (CCM) and the PCM is a slave to it. They communicate over a serial bus. The CCM handles all the functions displayed on the instrument cluster, including the trip computer functions and stores the car's current mileage. The Y body PCM has a few extra chips to handle this interface. I have never heard of anyone implementing a CCM in an F body or B body, but I suppose it's possible.
These PCMs also change from year to year, there may be more similarity for OBDII (96 and up) implementations.
These PCMs also change from year to year, there may be more similarity for OBDII (96 and up) implementations.
