Don't know, I started this stuff back in the Commodore 64 days!!
Unfortunatley the two people in the LS1 'scene', myself and Chris at HPT are maybe the only ones who know how to do this?.
The process.....
1 - Skip the Lean Cruise Platform check (different spot on all O.S's).
2 - Recalculate the checksum
3 - Fill Lean cruise table
NOTE: On ETC vehicles if you get the checksum wrong your PCM is toasted, chip off to recover it.
OR
Upgrade to any V3 O.S and use the MAP vs RPM AFR table to command leaner.
Cheers,
Ross
