4L75E TC-2 Transmission Control System Pinout
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4L75E TC-2 Transmission Control System Pinout Hello, I've been lurking around these forums and find there to be a wealth of information. This is my first post so hello.
We are building a 91 GMC Sierra with an LS3 and 4L75E auto transmission swap and I'm the wiring guy. I had to de-pin the transmission side connector from the TC-2 controller harness in order to route the wires through a grommet and although I identified each wire color/cavity, I mixed up the two black/white wires. One is part of a twisted pair (orange/red). Does anyone here have a pinout of the TC-2 harness?
We are building a 91 GMC Sierra with an LS3 and 4L75E auto transmission swap and I'm the wiring guy. I had to de-pin the transmission side connector from the TC-2 controller harness in order to route the wires through a grommet and although I identified each wire color/cavity, I mixed up the two black/white wires. One is part of a twisted pair (orange/red). Does anyone here have a pinout of the TC-2 harness?
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F, G, H, J, and W, not including the two Black/White wires which are located at M and V.
I've google searched, of course, and the wire colors in the attachment you provided are different.
Cav Wire Color
A Pink/Black
B Pink/Red
C Yellow/Red
D Violet/Black
E Yellow
Etc.
I've google searched, of course, and the wire colors in the attachment you provided are different.
Cav Wire Color
A Pink/Black
B Pink/Red
C Yellow/Red
D Violet/Black
E Yellow
Etc.
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Why GM does not include a pin out for each connector is beyond me. They do it for the engine harnesses.
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Supermatic "Connect and Cruise TC-2" Transmission Control System
Connector at transmission:
CAV Wire Color
A Pk/Bk
B Pk/Rd
C Yl/Rd
D Vt/Br
E Yl
F
G
H
J
K Or/Rd
L Yl/Or
M Bk/Wt
N Gy/Bk
P Gy/Lg
Q
R Gy/Rd
S Vt/Rd
T Pk/Lg
U Vt/Lg
V Bk/Wt
One black and white (Bk/Wt) wire is part of a twisted pair, which denotes a sensor. Would it be the shaft speed sensor?
Connector at transmission:
CAV Wire Color
A Pk/Bk
B Pk/Rd
C Yl/Rd
D Vt/Br
E Yl
F
G
H
J
K Or/Rd
L Yl/Or
M Bk/Wt
N Gy/Bk
P Gy/Lg
Q
R Gy/Rd
S Vt/Rd
T Pk/Lg
U Vt/Lg
V Bk/Wt
One black and white (Bk/Wt) wire is part of a twisted pair, which denotes a sensor. Would it be the shaft speed sensor?
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Brett Foote
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From: Nitro Alley
Why didn't you say this was a super-matic controlled unit???
Just to double check... is the TCM a Blue box with red and white lettering on it?
Or is it just a stock looking TCM or ECM/ TCM combo box?
The stand alone super-matic Blue box is wired differently... I did not think they were for sale any more... Maybe new-old stock...
I will try to find some old GMPT over the counter PARTS instructions for you.
Just to double check... is the TCM a Blue box with red and white lettering on it?
Or is it just a stock looking TCM or ECM/ TCM combo box?
The stand alone super-matic Blue box is wired differently... I did not think they were for sale any more... Maybe new-old stock...
I will try to find some old GMPT over the counter PARTS instructions for you.
Thread Starter
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Why didn't you say this was a super-matic controlled unit???
Just to double check... is the TCM a Blue box with red and white lettering on it?
Or is it just a stock looking TCM or ECM/ TCM combo box?
The stand alone super-matic Blue box is wired differently... I did not think they were for sale any more... Maybe new-old stock...
I will try to find some old GMPT over the counter PARTS instructions for you.
Just to double check... is the TCM a Blue box with red and white lettering on it?
Or is it just a stock looking TCM or ECM/ TCM combo box?
The stand alone super-matic Blue box is wired differently... I did not think they were for sale any more... Maybe new-old stock...
I will try to find some old GMPT over the counter PARTS instructions for you.
Here's some additional information regarding the kit components:
Trans control unit # 19302406 (4L60) or 19302411 (4L80)
Trans control harness # 19302408
Thanks for the assistance so far.
TECH Junkie
Joined: Jun 2008
Posts: 3,202
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From: Nitro Alley
Okay... So you do NOT have the oldest version, but you do NOT have the newest version either.
I am going to look for wiring info on the version you have...
I do not have OTC parts info on "NON-OEM/ RPO parts" in any of my books or digital database...
I will have to make some phone calls to the guys over at Chevy performance parts marketing to try and get some info.
It may take a few days... Hopefully someone else has one of these TCMs or has info to share with you in the meantime.
I am going to look for wiring info on the version you have...
I do not have OTC parts info on "NON-OEM/ RPO parts" in any of my books or digital database...
I will have to make some phone calls to the guys over at Chevy performance parts marketing to try and get some info.
It may take a few days... Hopefully someone else has one of these TCMs or has info to share with you in the meantime.
Thread Starter
Registered User
Joined: Aug 2019
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Okay... So you do NOT have the oldest version, but you do NOT have the newest version either.
I am going to look for wiring info on the version you have...
I do not have OTC parts info on "NON-OEM/ RPO parts" in any of my books or digital database...
I will have to make some phone calls to the guys over at Chevy performance parts marketing to try and get some info.
It may take a few days... Hopefully someone else has one of these TCMs or has info to share with you in the meantime.
I am going to look for wiring info on the version you have...
I do not have OTC parts info on "NON-OEM/ RPO parts" in any of my books or digital database...
I will have to make some phone calls to the guys over at Chevy performance parts marketing to try and get some info.
It may take a few days... Hopefully someone else has one of these TCMs or has info to share with you in the meantime.
Thank you so much for your help; I will be lurking here for some time to come
