L67 Lean Cruise Logic

[ProfessWRX]

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?

[In-Tech]

Hiya,
I don't follow the acronym's used by the aussies, L67 etc. From memory, the "logic" looks at the vin number and decides if it is correct to use. Usually takes a code patch "skip" so it will work correctly. Post your stock .bin and I can have a looky

[ProfessWRX]

Bin attached.

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

[ProfessWRX]

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

[The1]

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.

[ProfessWRX]

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’m after is the technical aspects of it. I’d really like to see the subroutines in their entirety.

[In-Tech]

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.

[ProfessWRX]

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 the last 4 of vin. Seed is unknown to me.

[In-Tech]

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.

Here's the latest file.

2G1WZ121049342922_Stock.bin

(512 KiB) Downloaded 59 times

2G1WZ121049342922_Stock.txt

(167.9 KiB) Downloaded 67 times

[ProfessWRX]

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.

Here's the latest file.

2G1WZ121049342922_Stock.bin

2G1WZ121049342922_Stock.txt

Thanks for that, I saw what they changed. Definitely not interested! What's the source for the text? Is that just a database dump from tunercat?