hello,
i have a couple questions on LS 1 style pcms
pcm's '99-02 use a bin file w\a 512 check sum and '03 up use a 1024. this is trucks f and y body. will a '03 pcm work in a '02 ?
are the drivers in a v-6 pcm for the injectors etc. to run a 8cyl ? if you program it? can you use a 1024 where a 512 goes ?

thanx
T-Rex

 

Thank you. ;-) You gave me the inspiration to investigate this. Just last Friday I was at a wrecking yard staring at a PCM out of a 2003+ truck and a 1999 Camaro wondering exactly the same thing. You can tell by the color of the connectors that plug into the PCM whether they are compatible or not.

The 2003+ truck uses a BLUE and a GREEN connector, and the 99-02 F/Y and 99-02 4.8/5.3/6.0 Truck uses a BLUE and a RED connector. 03 Y body uses BLUE and RED, and 04 Y body uses BLUE and GREEN.

1024K or 512K is the limit of the EEPROM chip size. I just tonight unsoldered an EEPROM out of a 99 LS1 and saw with my own two eyes it is 512K in size. You cannot put a 1024K image in a 512K EEPROM.

However, the table contents could be copied over. This is tedious, but should work. In other words if you wanted to copy changes from a 1024K based tune to a car that uses a 512K image, you could copy each table, one at a time. I have done this when I needed to move changes from OBD1 LT1 to OBD2 LT1.