ok, i need some help wiring up my LS1 for the car. ive tried posting my table in here, but its too large. this is what i have: http://home.comcast.net/~mrdude_1/LS1pinout.htm its a complete table of the 1999 Fbody LS1 PCM pinout. ive added a column for where it connects on a 3rdgen. as you can see, theres alot i dont know where/how to connect. im hopeing someone on here can help me and say that " C1 - 9 goes to the ground of the fuel pump relay" and give me help like that. this would be useful for everyone considering doing the swap themselves, and it would also be useful to put a LS1 in ANYTHING. ive searched for days and i have yet to find anything like this online... help?

this helped w/my 3800 swap. also go to his main page fro more info

http://www.dxsoftware.com/magnus/wiring.htm

thanks! that helps

The table you made will be pretty much useless because all of the splices you need to make come off of the white and blue connectors that go inside the car and the C100, C101 and C105 connectors. That table will help out if you need to trace some wires though.

I used the exact same table that Project: 85 2.8 bird gave a link to. Helped out tremendously. Now let me see if I can remember all of the splices I made......

I'll get back to ya.

.....

I can help ya out. I am at a library right now, and I dont have any of my pinouts and stuff, ect, ect, but I will give you a hand with this if you need. Its actually not as tough as it look. I know its pretty intimidating. Do you have an under the dash harness for the LS1?

Your car is a 91 and your LS1 PCM is also the same as mine. I can just show you a map-out of what I connected and to were. Shouldnt be too difficult. I just need to find my stuff and PM you when I get to my computer.

StngKlr you posted same time I did, so I didnt see his post now I need to reply to it. :P

He helped me out with some of my wiring. I actually wrote down most of the splices I made in a little map out between the car's harness pinout and the LS1's harness pinouts. So yeah, I'll get back to you too.

cool.. thanks StngKlr and Knyghtmare.


once i get this together, im going to try to put together a quasi FAQ like i did with the T56 install i did awhile back. rather then the usual major install parts, its just going to be the little details you need to know that noone ever posts.

99 LS1 PCM to Dash Harness
White (220) Plug
A TAN Oil Pressure
B GRY PCM 32 Clutch Anticipate Switch Signal
C PNK C105-B IGN Power for TCC Stop Lamp Switch
D PPL PCM 33 TCC/Cruse Brake Switch
E BLK/WHT Ground
H ORN/BLK PCM 34 PNP Switch Signal
J YEL/BLK Low Coolant Indicator
K DK GRN/WHT PCM 50 VSS Output

Blue (230) Plug
A GRY PCM 46 5V Feed (Fuel tank pressure)
B Brown w/Stripe PCM 25 MIL Lamp Control
C WHT PCM 45 EVAP Canister Vent Valve Control
E Blue PCM 55 Theft Deterrent Fuel Enable
F DK GRN/WHT PCM 17 A/C Request
G GRY PCM 23 Fuel Ground
H DK GRN PCM 64 Fuel Tank Pressure
J PPL PCM 54 Fuel Level Input
K DK GRN PCM 58 Serial Data (Class 2)



99 LS1 PCM to Front Harness

Large Plug C100 Plug
A PNK Hot in Run and Start (IGN/INJ Bank 1 15A)
B DK GRN/WHT PCM 43 A/C Clutch Relay Control
C DK GRN PCM 18 A/C Clutch Status
D GRY TPS +5v to TCS
E DK BLU TPS signal to TCS
G PNK Hot with IGN 1 Relay Engaged (Tranny/EGR 15A)
H DK BLU PCM 33 Cooling Fan 2 and 3 Relay Control
J DK GRN PCM 42 Cooling Fan 1 Relay Control
K BLK TPS sensor low to TCS

C101 Plug
A YEL/BLK Low Coolant Sensor
B PNK Hot in Run and Start (IGN/INJ Bank 2 15A)
C BRN PCM 36 Air Pump Relay Control
D DK GRN/WHT PCM 9 Fuel Pump Relay Control
E PNK/BLK PCM 19 Ignition Positive Voltage for PCM
G ORN PCM 57 Battery Positive Voltage for PCM
H BLK/WHT Ground
K GRY/BLK PCM 53 TCS Spark Retard Signal to Brake Control Module

C105 Plug
B PNK Hot with IGN 1 Relay Engaged (TCC Stop Lamp Switch/MAF/O2 20A)
D DK GRN PCM 37 Cruise Control Inhibit
F WHT PCM 13 Cruise Engaged Signal
G WHT PCM 10 Tach out to Brake Control Module
H PPL PCM 4 AIR Solenoid Relay Control

These are all of the pins/wires I did not use:
220- E,H,J,K
230- A,C,F,G,H,J
C100- B,C,D,E,K
C101- A,C,K
C105- D,F,H

So you can see there is not that many wires to hook up. Once you jump into it, it starts to go easy. This assuming you have a good knowledge of wiring, relays and so on... Also, my wiring may be a little different than yours because of certain options or accessories I chose not to use. My car basically had to be wired from scratch due to the shape the car was in when I got it so...

It will be easier if you get stumped to ask specific questions such as which pin/wire here goes to there. The way I explain things might confuse you.

Good luck, and start firing questions if you need to.