4L60E Trans wiring
Thread Starter
On The Tree
Joined: Mar 2011
Posts: 153
Likes: 1
From: Granite City, IL
4L60E Trans wiring I'm clipping transmission wires & getting this 4L60E pigtail ready to be soldered when I noticed that I'm missing the brown wire that goes to the transmission connector (Pin "U"). I I have about 12" of the brown wire on the pigtail but I need help finding out where it goes from there. I have been searching & cant find anything! Here are a couple pictures below.
Was actually working on my transmission connector today. My harness is originally setup for 4l80e and I now have to change it to 4l60e.
4l80e 11 wires
4l60e 13 wires
if I'm not mistaken
Spent few hours googling pinouts. After looking at pin outs and matching circuit #'s on the list for a 99-02 harness on lt1swap to match pin# for pcm connectors I came up with this real quick.
Hope it helps. If all the info I gathered is correct this should be on point.
Not sure though why your pin M is black and mine is Gray. I have two 4l60e plugs here and both pin M's are gray.
4l80e 11 wires
4l60e 13 wires
if I'm not mistaken
Spent few hours googling pinouts. After looking at pin outs and matching circuit #'s on the list for a 99-02 harness on lt1swap to match pin# for pcm connectors I came up with this real quick.
Hope it helps. If all the info I gathered is correct this should be on point.
Not sure though why your pin M is black and mine is Gray. I have two 4l60e plugs here and both pin M's are gray.
Thread Starter
On The Tree
Joined: Mar 2011
Posts: 153
Likes: 1
From: Granite City, IL
You were correct. I found the wire sitting to the side. I must have threw it to the side by mistake when I was doing some other stuff with the wires but it was already tagged that it needed to go to the #2 pin position on the red connector. Thanks for the reply!
Thread Starter
On The Tree
Joined: Mar 2011
Posts: 153
Likes: 1
From: Granite City, IL
Was actually working on my transmission connector today. My harness is originally setup for 4l80e and I now have to change it to 4l60e.
4l80e 11 wires
4l60e 13 wires
if I'm not mistaken
Spent few hours googling pinouts. After looking at pin outs and matching circuit #'s on the list for a 99-02 harness on lt1swap to match pin# for pcm connectors I came up with this real quick.
Hope it helps. If all the info I gathered is correct this should be on point.
Not sure though why your pin M is black and mine is Gray. I have two 4l60e plugs here and both pin M's are gray.
4l80e 11 wires
4l60e 13 wires
if I'm not mistaken
Spent few hours googling pinouts. After looking at pin outs and matching circuit #'s on the list for a 99-02 harness on lt1swap to match pin# for pcm connectors I came up with this real quick.
Hope it helps. If all the info I gathered is correct this should be on point.
Not sure though why your pin M is black and mine is Gray. I have two 4l60e plugs here and both pin M's are gray.
I have 2 4L60E plugs & the wire pin at "M" is black on both. I think it all comes down to where the sensor ground is coming from
. Good looking on that diagram. I wish I would have found that the hour I was searching before I made this thread. I'm going to save that in case I need it on the next build. 
Last edited by veltboy618; Jul 30, 2012 at 02:13 PM.
Thread Starter
On The Tree
Joined: Mar 2011
Posts: 153
Likes: 1
From: Granite City, IL
Yes I'm going to use the safety switch. I was told that I only needed to use the 4 wires from the bottom plug since I plan on using the starter crank & reverse lights from my cars wiring instead of the upper connector on the switch. Can you confirm that this is true?
Trending Topics
Honestly have no idea, if that is true that would be great and save me the headache.
I have a 2004 5.3l
Harness that came with it was all cut up and missing majority of it.
It had a beat up neutral switch zip tied to the engine with the larger connector sticking out of it with these wires
Pin D has blk/wht wire
Pin C has pink wire
Pin B has light green wire
Pin A is not used
Pin G has drk green wire
Pin F has gray wire
Pin E has pink wire
I ended up buying a 99-02 harness and the larger connector for the neutral switch was cut off and missing. The wires left over were
PRND pin# 62 to red PCM connector its a gray wire
PRND pin# 34 to blue PCM connector its a white wire
PRND pin# 32 to blue PCM connector its a blk/wht wire
PRND pin# 72 to blue PCM connector its a yellow wire
And that's all I got.
I bought a new pig tail that's supposed to be for the neutral switch(the bigger connector)
Pin D is black wire
Pin C is brown wire
Pin B is orange wire
Pin A is white wire
Pin G is yellow wire
Pin F is green wire
Pin E is purple wire
Do you have all your wires labeled on yours cause I'm at a lost.
If you really can ditch that connector it will help me out big fking time lol.
I have a 2004 5.3l
Harness that came with it was all cut up and missing majority of it.
It had a beat up neutral switch zip tied to the engine with the larger connector sticking out of it with these wires
Pin D has blk/wht wire
Pin C has pink wire
Pin B has light green wire
Pin A is not used
Pin G has drk green wire
Pin F has gray wire
Pin E has pink wire
I ended up buying a 99-02 harness and the larger connector for the neutral switch was cut off and missing. The wires left over were
PRND pin# 62 to red PCM connector its a gray wire
PRND pin# 34 to blue PCM connector its a white wire
PRND pin# 32 to blue PCM connector its a blk/wht wire
PRND pin# 72 to blue PCM connector its a yellow wire
And that's all I got.
I bought a new pig tail that's supposed to be for the neutral switch(the bigger connector)
Pin D is black wire
Pin C is brown wire
Pin B is orange wire
Pin A is white wire
Pin G is yellow wire
Pin F is green wire
Pin E is purple wire
Do you have all your wires labeled on yours cause I'm at a lost.
If you really can ditch that connector it will help me out big fking time lol.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Staging Lane
Joined: Mar 2010
Posts: 60
Likes: 5
i have been told by two different sources that you do no need the mlp switch but i still don't understand why or why not you actually need this or what it actually controls. can anybody help me out with this?
Staging Lane
Joined: Sep 2013
Posts: 71
Likes: 0
From: Liberty SC
Trans fluid temp I have a 2003 ECU with 6.0 4l80e installed out of a Heavy duty truck in my 71 c-10 . I have a stand alone harness.
Can someone tell me if the transmission fluid temp can be turn off/on feature that my tuner can do.
I bought a scan gauge 2 reader and was hoping to read transmission fluid temperature but it doesn't pickup a signal from the ECU. Can this be turned on/off by the tunner?
Thanks for any info.
Can someone tell me if the transmission fluid temp can be turn off/on feature that my tuner can do.
I bought a scan gauge 2 reader and was hoping to read transmission fluid temperature but it doesn't pickup a signal from the ECU. Can this be turned on/off by the tunner?
Thanks for any info.
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
You don`t Need the PRNDL switch but the PCM does use it to help driveability, and depending on the year/bodystyle of your wiring harness the power for your starter neutral safety switch passes through the upper connector if you use the truck underhood fuse center. Basically the computer uses the signal from it to determine idle rpm (park/neutral and in gear idle rpm may be different depending on the pcm programming), idle spark advance, and probably a bunch of other things. For most hotrod swaps we could eliminate it and not really notice any change. If your looking for OEM level perfect new car idle quality it wouldn`t hurt to keep it. I usually keep it if possible or switch to a P/N switch that gives the same function to the PCM. If you are going to get rid of it, just ask whoever tunes your pcm to set the PRNDL switch to NONE in the pcm.
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
I have a 2003 ECU with 6.0 4l80e installed out of a Heavy duty truck in my 71 c-10 . I have a stand alone harness.
Can someone tell me if the transmission fluid temp can be turn off/on feature that my tuner can do.
I bought a scan gauge 2 reader and was hoping to read transmission fluid temperature but it doesn't pickup a signal from the ECU. Can this be turned on/off by the tunner?
Thanks for any info.
Can someone tell me if the transmission fluid temp can be turn off/on feature that my tuner can do.
I bought a scan gauge 2 reader and was hoping to read transmission fluid temperature but it doesn't pickup a signal from the ECU. Can this be turned on/off by the tunner?
Thanks for any info.
Teching In
Joined: Sep 2014
Posts: 5
Likes: 0
Wiring my 4l60E, need help The plug coming off of the trans has two pink wires and two yellow and black wires and a white wire that I need to figure out where to connect them. The wires were cut.
On the trans plug "B" and "L" are both yellow and black. The plug on the other end of the harness has a yellow and black in the "C" and "M" plugs.
The trans plug has a pink wire in the "E" and "N". The plug on the other end of harness has a pink wire in "D" Does one go to a power source?
I hope I am making sense. ANyone have a good diagram of the trans plug and the harness?
Thanks
On the trans plug "B" and "L" are both yellow and black. The plug on the other end of the harness has a yellow and black in the "C" and "M" plugs.
The trans plug has a pink wire in the "E" and "N". The plug on the other end of harness has a pink wire in "D" Does one go to a power source?
I hope I am making sense. ANyone have a good diagram of the trans plug and the harness?
Thanks