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Have an LS2/4l70e out of a 2007 AWD TBSS- E40 PCM. (rebuilt trans with 2wd output shaft, housing and VSS)
Here's a few PIN's and wires that I could use some help with
C1 PIN 49- vehicle speed signal Do I need this? Or Remove?
C1 PIN 21- VSS to BCM Is this to speedo?? Or remove?
Wires from big black body harness connector (I think c206?) to trans computer module. 3 wires: yellow, dark blue, light blue. What do I do with these???
C3 pin35 -5 volt reference on body harness connector Remove?
C3 PIN 33 - Low reference on body harness connector Remove?
Light green and pink wire coming from OEM fuse box panel to big white transmission connector What are these, and do I need them to be hooked up to my new fusebox?
These should be the last few things for doing my own harness, and I must say, it's much easier than the daunting approve I had before I started!
Thanks a bunch, cant wait to get this bad boy on the road.
Anyone able to help me out? In addition to the above post...
I should be able to merge some of the hots (pink wires) into each other to go into the fuse box.
Is there anything I should be considering when doing so, ie: can I run all the injectors into 1 switched hot and into a single spot, or is that overload?
You vehicle speed sensor will need to feed either your gauges or the PCM for correct shifting to occur. From your words above, I can't tell which end of the wire you are referring to.
I'm guessing that yes, you could tie all injectors to one switched ignition hot location as long as it was not a low amperage feed. I'm thinking all eight injectors could easily consume 15 amps or more but I'd refer to a wiring diagram here first to be certain.
Have you been to the "LT1Swap.com" web site? Brandan's diagrams there should be able to answer all of your other questions.
You vehicle speed sensor will need to feed either your gauges or the PCM for correct shifting to occur. From your words above, I can't tell which end of the wire you are referring to. Yes, the VSS wires themselves route from the sensor to the TCM.
The pins I am talking about are both from the C1 pcm connector into black body harness connector. One has to be to the speed, but what's the other?!?
I'm guessing that yes, you could tie all injectors to one switched ignition hot location as long as it was not a low amperage feed. I'm thinking all eight injectors could easily consume 15 amps or more but I'd refer to a wiring diagram here first to be certain. I'll keep looking into thethe d and possibly of this.
Have you been to the "LT1Swap.com" web site? Brandan's diagrams there should be able to answer all of your other questions.
YES! His site is amazing, but he doesn't have anything specific to the E40 pcm.
Thanks Tipsy,
That is the pinout I used to hack out the rest of what I don't need, but the pins I'm asking about don't seem right via that sheet.
C1- pins 21 & 49 are both labled as vehicle speed signal and to remove them. The sheet says 1 goes to BCM, and the other to brake control module. I feel these may be needed, but am not sure what the brake control is, maybe they are to be removed?
C3- pins 33 & 35 are listed on that sheet as empty, but I've triple checked and I definitely have those pins in use on my stock LS2 harness !?!?!?!??
The other questions aren't covered in a pinout since they're trans related.
Update on a couple things in case people are looking for the same answers.
3 wires: yellow, dark blue, light blue that come from the trans harness into the I/P body harness connector. lignt blue= (-) serial data and dark blue is (+) serial data. These will go to the obdII. The yellow is an accessory voltage, which I believe is needed to be hooked to the fuse box. I have attached the pinouts for this connector.
Last edited by Fst_Byrd; Jan 24, 2019 at 08:10 PM.
Maybe a typo or something but, isn't the the 07+ ecm an "E38". Going through some of the same stuff right now with my swap (06 TBSS LS2/4L70e into a 70 C10).
Maybe a typo or something but, isn't the the 07+ ecm an "E38". Going through some of the same stuff right now with my swap (06 TBSS LS2/4L70e into a 70 C10).
TBSS used the E40 until 2006. There are a handful of late build 06s that were sold as a 2007 that got the E40 and 24x reluctor. Which confused the hell outta me initially when I got it all and it was an E40 setup. Haha
I believe 2007+ tbss got the e67 pcm...e38 was used in LS2 vettes, but don't quote me on that.
do you have your engine, harness and PCM yet?
Last edited by Fst_Byrd; Jan 24, 2019 at 08:15 PM.
I do. And already sank more money than I should have into rebuilding a 24x gen4.
I've worked on a lot of engine swaps- from stock sbc to built LS motors and won't ever go back to the old school motors. When you're done, you'll have a very reliable, efficient and powerful engine with a great powerband.
It's hard to wipe the smile off your face when driving my buddies 76' C10 with a bone stock LQ9 in it. So your truck will be a blast!
If you have any questions, shoot them over and I'll see what I can do to help out.
What are you doing for your TCM harness? I'm trying to figure what I need to keep from the range switch.
im not depinnong anything from the TCM harness, all wires will so as stock. As for the range switch (from what I've been able to gather) it's not "needed" but highly recommended. I will be keeping everything from the range switch but here's a pinout of it if that helps you.
C1 PIN 49- vehicle speed signal goes to abs, remove
C1 PIN 21- VSS to BCM goes to speed, keep
C3 pin35 -5 volt reference on body harness connector fan wiring, remove
C3 PIN 33 - Low reference on body harness same as above. Fan, remove
Now I still need to figure out what the yellow "accessory voltage" going to the trans harness is. I believe it needs fused, but would like to know what it's for and what size fuse, does it need relayed, hooked into ignition, etc.
The yellow accessory wire is "hot in run and and acc" and has a 10 amp fuse.
Originally Posted by 71ANTICARB
Are you running the BCM?
Thanks for the info on the acc wire!
I'm not using the BCM, but pulled the wires/ pins needed from it and will run them directly to what they need to go to- speedo, tach, cruise, ignition.
What are you doing for your TCM harness? I'm trying to figure what I need to keep from the range switch.
Hey Anticarb,
I found this in case you're still looking into wiring for the range switch, this guy seems to be the guy who knows all of this😊 :
Originally Posted by ls1nova71 Pin 12 hooks to the ignition switch (start), pin 1 goes to the starter relay 86, 85 will go to ground. 30 will be constant power and 87 will go to the starter.
Pin 11 is ignition power into the switch, and 10 is to the back up lights.
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LS2 Harness HELP 
