97 GTP Ground location

[widetrack]

I still have not been able to start my car. But I may have answer. My PCM is not working and I was reading wiring schematics on the PCM the ground is attached to the transmission but I am unable to locate it. I had the transmission rebuilt and maybe the ground was pinched and fell off or improperly reinstalled. The transmission case is very oxidized from sitting for a year and a half and now maybe not getting a good connection. Could anybody tell me where the ground is?

[BNaylor]

Originally Posted by widetrack

I still have not been able to start my car. But I may have answer. My PCM is not working and I was reading wiring schematics on the PCM the ground is attached to the transmission but I am unable to locate it. I had the transmission rebuilt and maybe the ground was pinched and fell off or improperly reinstalled. The transmission case is very oxidized from sitting for a year and a half and now maybe not getting a good connection. Could anybody tell me where the ground is?

The PCM for a '97 GTP has two grounds that eventually go back to the tranny ground point. On the PCM 80 pin connector you have Pin 21 and Pin 60. These ground inputs to the PCM are color coded black/white.

The grounds go to connection point S104 (wherever that may be) and from S104 go to the tranny ground point which is marked G129 in the wiring diagram out of the GM service manual.

I believe that the major ground points are located at the engine compartment fuse box and around the passenger side fuse block. The ground you are looking for may be internal to the transmission and probably inputs at the 20 way connector on the driver's side top of the tranny.








Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.

[BNaylor]

Here's another annotation that may be helpful in locating the ground:

G129 - Located on left side on transaxle stud

Good luck!







Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.[/quote]