pcm or ecm trouble on 98 6.5l 3500hd

[dakota89]

is there somebody who can gave me the wirering diagram for the pcm on a 98 3500hd i found that there is a brown with a white stripe was cut from the harness its in the midle plug on the b side and they run another wire going under the dash above clutch in the gray box they must a bypass that brown wire but the gm mech unhook that wire so i dont know where it was plug to a ground or 12v suply but they did put a fuse on the end of the wire going to the gray bax above the cluch so i m assuming a 12v suply and he also unhook it on the pcm harness so my high idle problem must be there i just supose but that white wire a the place of the brown eireand in to the gray bax again to ground or 12v suply if i m right about that wire i think it s the brake signal

 

[dakota89]

if i m not mistaking it going to b9 but should run it to ground or 12v source

 

[JMJNet]

Post #11 is the one that describe the High Idle Mod.

I got the feeling that the one not hooked up used to be the high idle mod.

http://www.thetruckstop.us/forum/showthread.php?6380-High-Idle-Installed-Wow!

 

[dakota89]

yesh i did look at your installation but i guess somebody cut a wire in the harness for some reason i m gone a have to figure where it was hook and the purpose of it it s a brown with a white stripe

 

[dakota89]

ok i got evrything figured out high idle and evrything it was a headache but finally got it thanks to you guys

 

[GM Guy]

so was the GM dealer to blame for the cutting or was it the previous owners work? Got 'er all back to factory then?

 

[dakota89]

it was cut before the dealer no to factry i try the high idle work with brown wire back in place but as soon i pull my pto lever it will kill the high idle so i put back the white wire going under the dash i found out when i plug it in the gray box above the clutch pedal to the pin related to ground abs it s working perfect

 

[Screaming eagle]

That is a 4.63 ratio, not sure if my ECM would work. Mine is out of a C&C 3500 with 5 speed and 4.10 ratio.

Maybe someone who knows better can tell us for sure. The VSSB (VEHICLE SPEED SENSOR BUFFER) can be adjusted to compensate for gearing changes

Would your computer fit a 97 6.5 diesel auto crew cab auto dullie if so how much n could u call me or text 814 592 3909