4L80E sport shift mode

[780ripper]

Hi everyone, i have questions about this topic as well;

how can you tell if the pcm is programmed to accept inputs for pin 71 ( is there a line for it in tuner pro? )

will it light up the tow haul icon in the dash if its activated or not?

i have the pin 71 wiring hooked up to a grounded push button but cant tell the difference when using it and the light never comes on.

[sachem]

Hi everyone, i have questions about this topic as well;

how can you tell if the pcm is programmed to accept inputs for pin 71 ( is there a line for it in tuner pro? )

will it light up the tow haul icon in the dash if its activated or not?

i have the pin 71 wiring hooked up to a grounded push button but cant tell the difference when using it and the light never comes on.

There is a selection in tuner pro for pin 71 activation. I am not at my computer, but it should be in the parameter section under trans. You'll find 3 selections to choose from. Activate pin 71.
As for the tow/haul light, take a look at this link: https://ls1tech.com/forums/conversio...thout-bcm.html

Hope this helps.

[780ripper]

Hi Sachem, thank you for the reply,

first of all i fell prey to the broken steering column shifter wiring so i had to test that first, and decided on a new button location.

once i relocated the momentary push button tow haul mode was activated and the truck shifted differently and the indicator lite was coming on and going off in the dash.

i do notice that the indicator light goes out after a few minutes and tow haul is shut off.

all of this is achieved without pin 71 being connected or being enabled for now. i will look at the transmission parameters and see what is set up.