Here's a custom subroutine hooked into the Fan Coolant temp Lookup routine. This is hooked where OS check if the Fan temps are controlled by BCM. My code instead jumps to this subroutine. Checks for the performance mode and if in performance mode subtracts 40C from the Fan Turn On/Off temps and jump...

edit: I think I found one that makes slightly more sense.

Hiya, I paid for the latest GM file for that VIN and it is slightly different than what you posted. Sadly John@TunerCat hasn't made a Lean Cruise patch for it yet. It shouldn't be too tough to make one although I haven't played with more than 1 p04 yet. I have to see if I have a core at the shop. H...

Edit: Too complex. Should be simpler.

Interesting dump, I'm not saying it isn't correct, just some things seem weird. Are the last 4 digits of your vin 2922? Is the seed C015 or 00C0? Is this a 2004 Grand Prix or a Monte Carlo with a 3.8L? I don't have much non V8 stuff :( I'll keep hunting tomorrow. It’s an 04 Monte 3800 SC. 2922 is t...

Aussie L67 pcm's are different to American ones i think, we were still Delco memcal pcm's. The algo is after X amount of time above X Speed then enable the lean cruise table which is an AFR Target Modifier. Yeah I know the basics. I’ve got it in another car just not this one that I’ve seen. What I’...

Yeah I don't see anything that looks it up.

Bin attached.

Definitely interested in how you trace it. I could look for the VIN lookups I suppose.

Hey guys, I'm looking into lean cruise and haven't found it in my american L67 PCM.

Has anybody got the logic disassembled so I can look at how they do it in the Australian PCMs? Also where the timing and fuel are implemented into the logic flow?

Yeah I don’t imagine it will take too long once I use the database.
I have mapped a significant amount so as I go it’s getting easier with the web of info I’ve already put together.