jdperk-86elco

My computer is a 2002 truck PCM and I have EFIlive for scan and tune. I just started to play with the tune package to first reset my tach to read correctly and so I also look through all the setting to see what they were and what I could change.

So I was looking in the transmission settings and I see the possiblity to have normal and performance transmission settings and the information talks about pin 71 for the performance and it also mensions pin 31 for manual shift.

So does this mean I automatically have the dual tune for pin 71 on this truck pcm?

What does pin 31 mean for manual shift does that mean I can shift the transmission into L1 and press a button connected to pin 31 to make it shift manually?

Phoenix 5.7

iTrader: (7)

many trucks have a dual tune for towing. could be what u have on urs.

jdperk-86elco

These options enable the various shift pattern modes within the PCM.
Note: J1 is the 'BLUE' connector on the PCM.
Switch types used must be momentary connect to ground.

'No Switch' = Performance mode via a switch is not functional.
'One Switch' = Performance mode via a switch can be activated (J1 - pin71).
'Two Switches' = Performance mode via a switch can be activated (J1 - pin71), and Manual Mode can be activated (J1 - pin31).
'C2 Data Bus' = Shift pattern modes are sent on the data bus to the PCM from another module, eg - BCM.

Only the following values may be entered into this table:
- No Switch
- One Switch
- Two Switches
- C2 Data Bus


EFI states that I can set up two switches pin 71 and pin 31. Pin 31 states that Manual Mode what does that mean? Does that mean I can press a button connected to pin 31 and it will only shift the transmission when I press the button?

AceHaag

iTrader: (12)

could this dual tune be done on an 05 silverado with an 8.1?

daevans315

I have been attempting to enable the tow haul mode on a 2002 s-10 4.3 with a 4l60E that did not originally have this feature. I have had my PCM reflashed by PCMforless.com to enable the "pin 71" feature listed above. PCMforless has verified that there are tow haul tables there and they do have "tow haul" values there.
I have double and triple checked my wiring and pin placement and I am very sure that I am getting a good temporary ground to pin 71. However, there is no change in shifting after Pin71 is grounded.

Does anyone have any suggestions on how to trouble shoot this further?

daevans315

In my research and email exchanges I had assumed that a momentary contact to ground means that you provide ground to the pin for something like 1 second then remove it. That switches to the second program. Touching to ground again for 1 sec switches back. Is this correct or does it need a continuous ground for the duration of the performance program?
I just had a discussion with two different people that assumed that it would need to see ground on pin 71 for the entire time the performance program was active.

Jones'n

Try grounding it the whole time and see what happens.

Bo185

Could you wire in an LED to let you know which mode you are in? Like the trucks have the tow haul mode lights.

daevans315

I just took it with for a drive with Pin 71 attached to the negative battery terminal. Still nothing.

G-Body

iTrader: (4)

On mine I just need a momentary ground, but then again it is a 5.3L LSx. I didn`t even know that such an option was available on a 4.3, but then again I don`t play with them.

You can`t wire in a light to let you know what mode you are in like in a factory install since there is only a momentary ground. In the factory install the light is controlled by the BCM which is bypassed when you go direct to pin 71.

88s10

iTrader: (8)

Did any body have any luck trying this?

Jhankinson

iTrader: (1)

Mine works just fine....it works like a tow/haul. I have an fbody motor and ecm and it uses a momentary push button ground. there is no light to tell you which mode you are in....but i knowwhen its in cause it greatly increases the shift firmness and pattern for when i run the 1/4. And then normally when i start it it runs with a much milder trans pattern for cruising and stuff...you dont need all the high line pressure and hard shifting on the highway.

daevans315

I did get this to work on the 4.3 as well. It turns out that the PCM editor that the shop I was sending my PCM off to did not actualy have the ability to modify this part of the PCM. Once this was discovered and the shop switched to EFILIVE it worked flawlessly.

88s10

iTrader: (8)

thanks for the info im gonna try it this weekend. ill have to search to see how much line pressure is good for a stock 4l60e

wait4me

iTrader: (10)

Guys there is more to it than just me turning on the other stuff. Mine Does change timing and fuel ratios and transmission functions. Works pretty good. But i only set up computers like that for people when they come in person.

AmericanMuscle313

iTrader: (5)

Would it be possible to set up the momentary switch to the pcm and electric cut outs to activate them both at the same time? That way you know when the second tune is activated. You could have a tune for cruising, emissions, fuel economy and then a second tune for all out performance with the cutouts open.
Would this work?

FirstGen

iTrader: (10)

Is this possible to do with LS1Edit or only EFILive or HP Tuners?
Thanks.

wait4me

iTrader: (10)

It is a modified os from EFILive. I can make it availible if people show an interest.

AmericanMuscle313

iTrader: (5)

I would be interested if it was available through a mail order tune.

Jhankinson

iTrader: (1)

I would be interested in changing mine from just a shift point change to a full blown tune change if you did it mail order too. I love the one you did for me for the shift patterns...it would be awesome to be able to have a full tune. Just let me know.