Conversions & Swaps LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

Which wires are power and ground for the ecm?

Thread Tools
 
Search this Thread
 
Old Sep 29, 2008 | 12:23 PM
  #1  
thunderstruck507's Avatar
Thread Starter
11 Second Club
iTrader: (18)
 
Joined: Mar 2008
Posts: 8,358
Likes: 27
From: Northwest AR
Default Which wires are power and ground for the ecm?

Looking at my wiring info, it looks like there is 1 orange wire that needs constant, there are 3 ground wires behind the drivers head.

Are there more I'm missing? Just looking to get the computer to communicate with a diagnostic reader

thanks!
Reply
Old Sep 29, 2008 | 01:12 PM
  #2  
ryanvv355's Avatar
11 Second Club
iTrader: (17)
 
Joined: Mar 2007
Posts: 756
Likes: 1
From: Hudsonville, MI
Default

99-02 F-body

C1 Blue
1 - GND
20 - +12v constant
40 - GND
57 - +12v constant

C2 Red
1 - GND
40 - GND
Reply
Old Sep 29, 2008 | 01:49 PM
  #3  
thunderstruck507's Avatar
Thread Starter
11 Second Club
iTrader: (18)
 
Joined: Mar 2008
Posts: 8,358
Likes: 27
From: Northwest AR
Default

do you know what those go to on the other end? like did they originally have plugs on them (camaro body plugs for example)
Reply
Old Sep 29, 2008 | 02:02 PM
  #4  
ryanvv355's Avatar
11 Second Club
iTrader: (17)
 
Joined: Mar 2007
Posts: 756
Likes: 1
From: Hudsonville, MI
Default

The constants went to the fuse block connector, the grounds should be terminated at the rear of the engine
Reply
Old Sep 29, 2008 | 02:06 PM
  #5  
thunderstruck507's Avatar
Thread Starter
11 Second Club
iTrader: (18)
 
Joined: Mar 2008
Posts: 8,358
Likes: 27
From: Northwest AR
Default

I have 1 that was in one of the c100 plugs, it is orange

I don't know where the second is or what color it should be, for grounds I have 3 on the back of the head, not 4
Reply
Old Sep 29, 2008 | 02:36 PM
  #6  
stealth71's Avatar
11 Second Club
iTrader: (15)
 
Joined: May 2005
Posts: 1,337
Likes: 1
From: Orlando
Default

I don't have the wiring info in front of me, but I recall wiring:

Constant: ORN C101 G - 10A

Ignition to:
C100 A -page { size: 8.5in 11in; margin: 0.79in } P { margin-bottom: 0.08in } --> (IGN/INJ Bank 1 15A)
C101 B - (IGN/INJ Bank 2 15A)

C100 G - (Tranny/EGR 15A) - I rewired this to my Reverse lockout for T56
C101 E -PNK/BLK 15A - PCM 19 Ignition Positive Voltage for PCM
C105 B -
&nbs
Reply
Old Sep 29, 2008 | 02:40 PM
  #7  
ryanvv355's Avatar
11 Second Club
iTrader: (17)
 
Joined: Mar 2007
Posts: 756
Likes: 1
From: Hudsonville, MI
Default

My set up was a truck so its probably different, the pinouts i put above are for an F-bod though
Reply
Old Sep 29, 2008 | 02:49 PM
  #8  
thunderstruck507's Avatar
Thread Starter
11 Second Club
iTrader: (18)
 
Joined: Mar 2008
Posts: 8,358
Likes: 27
From: Northwest AR
Default

well i pulled the computer and grounded all and had power to both places, but still no communication

starting to look like a bad computer to me unless i'm missing something...think i'm going to focus on getting everything else done and see what happens when i turn the key...if nothing else at least the rest of the car will be done
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

 Brett Foote
story-1

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-2

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-3

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-4

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-5

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-6

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-7

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-8

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-9

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
Old Sep 30, 2008 | 09:40 AM
  #9  
Carshopinc.com's Avatar
LS1TECH Sponsor
iTrader: (5)
 
Joined: Sep 2007
Posts: 645
Likes: 0
From: Moline, ILLINOIS
Default

No communication as in not talking to the scan software? If so did you wire the aldl correctly?
Reply
Old Sep 30, 2008 | 11:40 AM
  #10  
thunderstruck507's Avatar
Thread Starter
11 Second Club
iTrader: (18)
 
Joined: Mar 2008
Posts: 8,358
Likes: 27
From: Northwest AR
Default

I'm going to double check again, but I believe the wire was purple, 2 grounds, and a hot wire to the port.

And correct, when I plug in the Snap On scanner and go to anything it says "waiting" and then "no communication"

Someone told me it could be locked by a handheld tuner, is this true?
Reply




All times are GMT -5. The time now is 04:52 PM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-04 18:13:20


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-3
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-4
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-5
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-6
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-7
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-8
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-9
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE