HMMWV TCM Schematic

1985 - Present, Questions, discussions, regarding anything related to the Humvee. (NO AUCTION or EBAY)

Moderator: Kurt Lesser

Post Reply
wildchildvic
G-Private
G-Private
Posts: 6
Joined: Wed Aug 16, 2017 8:19 am

HMMWV TCM Schematic

Post by wildchildvic » Thu Feb 08, 2018 9:17 am

I am looking for the schematic for a TCM on a HMMWV. There is 2 grounds on the J2 diagnostic port. I need to know which one is the chassis ground and which is the signal ground. Pin A and F is the grounds.

User avatar
Ted Gates
G-Brigadier General
G-Brigadier General
Posts: 2220
Joined: Sun Dec 15, 2002 2:13 pm
Location: Eaton Rapids, MI

Re: HMMWV TCM Schematic

Post by Ted Gates » Thu Feb 08, 2018 1:34 pm

On TCM J2 connector (6 pin), A goes to TCM J1 A which goes to TCM C2 which is the TCM ground
F goes to TCM J1 F which goes to TCM TCM C1 also labeled as TCM ground

Both C1 and C2 are connected to the wires 599A and 599B which go to the shunt inside battery box.

U / B9 of the TCM is MIL Control earth for the trans check LED lamp.

wildchildvic
G-Private
G-Private
Posts: 6
Joined: Wed Aug 16, 2017 8:19 am

Re: HMMWV TCM Schematic

Post by wildchildvic » Thu Feb 08, 2018 3:45 pm

Thank you for your response. Yes I have the schematics to. I see that you are correct, however if you look inside the TCM box you will notice that either pin F or A goes directly to ground in the box. The other ground will tie into the big harness of the TCM. The TM's do not cover the wiring inside the TCM box. It only shows the pins on outside of the box. I do not have one laying around to take the cover off.

https://www.ebay.com/itm/Used-Transmiss ... 0005.m1851

wildchildvic
G-Private
G-Private
Posts: 6
Joined: Wed Aug 16, 2017 8:19 am

Re: HMMWV TCM Schematic

Post by wildchildvic » Fri Feb 09, 2018 2:50 pm

Diag.jpg
Diag.jpg (32.22 KiB) Viewed 252 times
Here is a pic of what I was looking for.

Post Reply

Return to “Humvee Technical Knowledge Base -”

Who is online

Users browsing this forum: No registered users and 4 guests