Need help with MSD TCM wiring

[FLFrank35]

I have a Holley Sniper EFI (550-510) on a BluePrint crate Ford 306,
a Ford 4R70W with the MSD Atomic TCM (2760),
and a Lokar automatic electronic sport shifter.

Is there anyone with similar components that can help? I've reached out to Performance Automatic, BluePrint and Holley/MSD but haven't had any luck.


I believe I have all the wiring diagrams but do not quite understanding were to physically make some of the wire connections. I think I have the EFI wired correctly, but trying the integrate the TCM is proving to be difficult for me, specifically on the TCM 12-pin JAE connector:


Pin 1. Overdrive Cancel - I don't have a button for this. Do I need this since the shifter has manual/bump-shift mode? Can I ignore this wire?


Pin 2. TPS Ground reference - I believe this is basically a chassis ground, right?


Pin 3. Calibration Select - ??? Have no idea.


Pin 4. Manual Bump up/Manual mode select - Does this get connected to one or all of the Red wires (open circuit) of the shifter micro-switches?


Pin 5. TCC Lock - Does this go to the brake switch...Brake OFF side? Or someplace else?


Pin 6. Speed Out - Does this go to the speedometer?


Pin 7. TCC Unlock - Does this go to the brake switch...Brake ON side? Or someplace else?


Pin 8. TPS 5V - I think I know this one...I have an EFI and this is for carb so I don't think I need this so I tied it off.


Pin 9. Manual Bump Down - Does this get connected to one or all of the Blue wires (closed circuit) of the shifter micro-switches?


Pin 10. 12V Ignition - I think I got this too...Switched on 12 volt from ignition switch or other switched-on source.


Pin 11. RPM/Tach In - I took this signal from the EFI Tach Output.


Pin 12. - TPS Signal In - Not sure were to connect this. Don't see anything coming from the EFI that indicates TPS signal.

[bnelson]

Hey Frank. I have Blueprint SBC with Sniper and TCI EZTCU trans control. Not the same but looks like pretty similar. One thing you will need is a stand alone TPS. I bought one from TCI that is fitted for carb or the Sniper. The trans control needs TPS/RPM/MPH to be able to operate. The Sniper has its own built in TPS for its management but you would need to split that wire to use it. I have been told by both Holley and TCI not to do this as it can have an affect on the EFI. The pin 3 is for a separate program you can set up with shift points and such. On mine I have one program set as normal and one for performance mode with shifts set harder and RPM's higher. Looks like pin 4 goes to momentary switch to ground to activate manual mode and to upshift. Not sure how your shifter has that momentary switch built in? Pin 5 would go to another momentary switch to lock up manually. You can ignore if not planning to use that function. Pin 6 is for speedometer. I did not use. Pin seven looks like TCC unlock for when breaks are applied. Pin 8 would be the 5v wire from the stand alone TPS I mentioned above. The TCI TPS had a harness on it that plugged directly to my trans control harness. Not sure on yours. Pin 9 would be momentary switch to ground to up/down shift. Is that built into your shifter? I used a two way rocker switch so pushing on one side down shifts and other side up shifts. Its really set up for paddle shifers. I just didn't have the money. Pin 10 as you say. Pin 11 I also used the RPM output from Sniper. Pin 12 I'm not sure as stated above all the TPS wiring was in pre installed harness. I ordered a bunch of back lit switches for mine and placed under arm rest for easy operation. Hope that helps a little. Was my first experience setting electronic trans up as well. It took me quite a while to figure it all out.

130964

[FLFrank35]

Bnelson, thanks very much for the detailed explanation!:D That filled in many of the blanks. I'm still learning the terminology, so that helped.
Hopefully I'll get a few more answers and finish up the wiring soon.

Nice job on your console!

Thanks again,
Frank

[FLFrank35]

Where do we get the 5 volts from to run through the TPS? Does the sensor step down the 12 volts, or...?

[bnelson]

Where do we get the 5 volts from to run through the TPS? Does the sensor step down the 12 volts, or...?

Yes. It will be the signal output from the TPS.

[FLFrank35]

Oooh, ok, I think I see. Please forgive my inexperience...So I understand correctly, we put 12v in to the sensor and it sends 5v out?
Wiring makes by brain hurt.

[bnelson]

LOL. Me to. The TPS you get should have a wiring diagram that will show whats what. I think its actually .5V needed but I see some say they only require .2V I guess it vary's by trans control. Mine just said .5V minimum.

[FLFrank35]

Cool...magic.
Thanks for your help! Greatly appreciated:o

[Briansshop]

The wires of the TPS sensor are a 5v supply voltage from the ECM, sensor ground, and the TPS signal. The signal is the result of the sensor varying the voltage - the TPS signal - back to the ECM.