7427 Rev limiter / 4L80E question

[1BadAction]

009F seems to be the byte used in 0E for the MNP switch.

L5453 FDB $009F ; 59, PATTERN, MNP PATTERN
;
; b7 (not used)
; b6 (not used)
; b5 (not used)
; b4 (not used)
;
; b3 1 = ILLEGAL PATTERN REQUESTED
; b2 1 = 'MANUAL' PATTERN REQUESTED
; b1 1 = 'PERFORMANCE' PATTERN REQUESTED
; b0 1 = 'NORMAL' PATTERN REQUESTED
;-----------------------------

there aren't too many places where it is stored to.... DTC77 also is applicable to it.

i can't find any applications from the factory that used it though, so finding out the pin scheme required is going to be interesting.

I've wanted to do this on my 7060 ($D8).. The bin has tables and LOOKS like it would work, but no clue how I would go about tracing it down. I'm also working under the assumption that it would be a momentarily grounded pin that switches between the modes. Guess I could start grounding random pins to see if my shift patterns change. (quick, someone invest in reman 7060s)

I guess I just can't shake the idea that there is a completely setup tow/haul mode in my factory ECM that I'm not using. Although I suppose it may be something vestigial that never was completed.

[RobertISaar]

gah.... i wouldn't recommend that.... and if i had to guess, i would expect a 3-position switch. the DTC for it shows a timer for invalid signal, so i don't think a momentary switch would make sense.

what i would do is follow the code far enough back to see where it is getting those mode determinations from.... if it is coming directly from a port on the processor, then you could follow the circuit(s) out to the connectors and you'll know what needs connected and how. if it coming in over SPI/SCI, then things get more fun.

[1BadAction]

The reason I say momentary ground, is that's how the LT1 computers did it, and even the 99+ LS1 PCMs have a setting for a depreciated "mom to ground" tow haul mode. Guess you could look at the LT1 programming and see if they have the same modes present?

[dubwise]

Thanks again for the responses guys..

1BadAction- Where did you get the $D8 def for the 7060? If you could point me to it that would be awesome.

RobertISaar- Where is the code for the 7060 located? I would like to dig through it for fun to see what I can come up with for the performance / tow mode.

[RobertISaar]

i don't appear to have a hack for D8... was one ever released?

[1BadAction]

i don't appear to have a hack for D8... was one ever released?

No idea, I've been using the AWBK Hack and the BAMY_CAL from the same PCM. Not sure what's different but the items I've added to the XDF all seem to line up and work correctly. IAC deadbands, O2 limits, etc.

Are CAL files the same as Hacs?

(EDIT: attached both)

[RobertISaar]

No idea, I've been using the AWBK Hack and the BAMY_CAL from the same PCM. Not sure what's different but the items I've added to the XDF all seem to line up and work correctly. IAC deadbands, O2 limits, etc.

Are CAL files the same as Hacs?

(EDIT: attached both)

hmm..... all calibration, no algorithm..... i'm not seeing the alternate shift mode status bytes in the datastream either, so finding the code that deals with it won't be as simple. assuming the perf vs normal tables are done like everything else from the era, at some point, X will point to the beginning of one of them and then offset via a ABX when necessary. that will depend on how the tables are arranged in the calibration too.....

[EagleMark]

No idea, I've been using the AWBK Hack and the BAMY_CAL from the same PCM. Not sure what's different but the items I've added to the XDF all seem to line up and work correctly. IAC deadbands, O2 limits, etc.

Are CAL files the same as Hacs?

(EDIT: attached both)

I would use the Bamy_cal.src.

All Axxx were superceeded to Bxxx and technically this is $D8, but we left the files as $85 when I did the initial work on $85 files when I had a truck to work on a few days... story here...
http://www.gearhead-efi.com/Fuel-Inj...erceeded-to-D8

[1BadAction]

Thanks again for the responses guys..

1BadAction- Where did you get the $D8 def for the 7060? If you could point me to it that would be awesome.

RobertISaar- Where is the code for the 7060 located? I would like to dig through it for fun to see what I can come up with for the performance / tow mode.

Stock $D8 BINs attached. One for the HD Suburban (BAMT) and the other from a 454ss (BAMY). BAMY is a much better starter tune.

[billygraves]

........

[1BadAction]

Longer gear holds and more spacing between up/downshifts when towing. I'd likely use a table close to stock for the tow/haul, then the normal tables would have my day to day shift pattern, which makes the truck FEEL more responsive.

In the 7060, $D8 Masks, the "Performance mode" Shift tables are all there, and they are complete. The do indeed look like performance tables, not hot mode tables like the later trucks have.

Why do you want to use the Perf Switch? Just asking..... One comment in this. If you see this in the calibration listing or your BIN/XDF, I would look into a few things first. What pins are the PERF Sw meched onto @ the PCM/TCM? If it is a NON-momentary sw, will the switch change, show up in the ADX or data stream? (Does it work?) Are there DIFFERENT 1-2, 2-3, 3-4 Upshift tables,Downshift tables and Kickdown calibrations listed? Will the DTC Function in the Illegal postion and set the diag code?