LS198Z28

iTrader: (5)

I finished with my conversion, and so far I only have one problem. my fuel gauge does not work. where does the fuel gauge output wire (dk Blue) go on the 02 pcm? i have searched, but with no success. wire diagrams for the 02 don't seems to show one, also where do i get the table for it to work correctly??

ryansm1

iTrader: (8)

Fuel gauge output DK BLU from Red C1-36 goes to Red C2-38.

Pinout: http://www.ls2.com/boggs/torques/98pinpcm.htm
Swap guide: http://www.chipsbyal.com/convert98/

Once you swap the pins, you will have to swap the fuel segment from the 0411 Express Van to your file. If you use EFILive, I can send you my tune (OS 12212156, from 02 F-body) with the segment swapped and parameters corrected for the 98 tank. If you use HPTuners, you'll have to find a way of doing this.

LS198Z28

iTrader: (5)

that is where i have it now, and it is not working, it only reads full, even though i set the tables up so that it would read empty. i have hp tuners,

ryansm1

iTrader: (8)

Have you swapped the fuel segment? The 99+ OSs expected a different input from the sending unit than the 98s, which is why you need to swap with the Express Van OS (and then use the parameters from your 98 OS to have it gauge the level correctly).

shoemike

iTrader: (25)

it may be possible to edit the sending unit values in the tune.

WKMCD

iTrader: (2)

Ed Hutchings - EDCMAT-L1 - ran into the same problem when he did mine. You might want to PM him.

Doc

iTrader: (9)

While HPT is a fine product, I do not know of a way an end user can do the fuel segment swap. If you have somebody swap the segment with EFI Live then you will in effect have a "Custom" Operating system an render future tuning with HPT useless.

As far as I know if you want to continue to use HPT, then you will need to swap the cluster and sending unit in the tank. The new cluster only uses 17 wires as opposed to the original 35 on the 98. I know, not more wiring!

Hopefully, I am not up to date with HPT and they have added this capability.

slow

iTrader: (7)

Why would a fuel segment swap make it a custom OS? If you swap fuel segments in the raw binary file, the OS stays the same, it just changes a block of the calibration code from one to the other.

You just need to read the file made with EFI with HPT to get the data in the the format that HPT wants, or somebody with hpt could make the file work if they have an unlimited tuning for that year/make.model, and load in a binary file.

Doc

iTrader: (9)

Had a customer that we did a pin / segment swap. A year later, car was sold to another individual that took it south. That person went to another shop for a heads / cam swap.

That shop called me and asked why I "locked" the tune. I don't lock any tune- period. Come to find out they were using HPT- they could not talk to it. They changed the OS but, then his fuel gage didn't work, which led to a cluster swap.

Maybe somebody could read it some how?

Maybe ED from (Horsepower factory) could chime in? Jesse B?

LS198Z28

iTrader: (5)

im going to pm ed right now, WKMCD, and see if he has any insight to into this. Im now contemplating going ahead and swapping the fuel sending unit, and seeing if i can make the old cluster work. will post up results.

slow

iTrader: (7)

Doc, did you change the vin number to a correct 1998 vin, or kept it a 1999-2002 vin from the 99+ pcm?, that is probably the issue with HPT, as they think it is a 98 based on the vin, and try to unlock it using the 98 seed/key.

Ryan

edcmat-l1

iTrader: (10)

As far as I know, there's no way to do it with HPtuners. I don't edit code.

I believe you can send your tune to the guys at HPT and they'll do it for you. Ask over on the HPT forum.

LS198Z28

iTrader: (5)

ok that is my next forum to ask on. thank you for your help, and if i come up with a solution, then ill post it up on here

Frost

iTrader: (45)

This is very likely the issue....

foff667

iTrader: (2)

Swapping a segment does not have the effect of a custom operating system as we've done dozens of transmission segment swaps for our customers without issue.

With that said the tuner will probably get a vin/os pair error if the vin in the pcm doesn't match what operating systems GM offered which is the standard we go by. This check is there for many reasons and cannot be removed as it is used to keep the integrity of our Year/Model licensing.

So if you plan to install a 99 pcm into your 98 you would need to have the 99 vin still in the pcm to do so.

-Bill

Doc

iTrader: (9)

I do put the original 98 VIN in the swap vehicles. EFI Live does not care.

foff667

iTrader: (2)

Yeah they don't offer year/model licensing so don't need to keep the integrity of the vin number. Our year/model licenses have been very well received since day one and are the one most of our customers opt for so the integrity check needs to stay.