4t40e wiring questions

[gmto2nr]

Hello Everyone,

New to the forum and excited to use my set up. I have a Microsquirt that I am using to control the 4t40e trans but have a few questions..

1. EPC solenoid - this on the MS is pin 10, my pressure solenoid has a high and low wire in the trans for this in the 20 pin connector for pos and neg and I think it is PWM, I hook the MS to the high or + wire on the trans side, what controls the negative side and PWM?

2. The notes indicate that the 4t40e is supported and only inputs B & C are used.. are these the selector inputs?

3.My engine will be high boost, can I use TPS and MAP for the trans controller? Benefit or no?

I know there are a few on here that have hooked to this trans and I would like feedback on this as I am close and have most everything pinned except the concerns above.

Thanks guys!!

* Mike at EFI source loaded the file for the 4t40e on the controller, if others have set up configs that would make it easier I would appreciate it! No file currently available..

[prof315]

1. EPC solenoid- the high or + wire gets 12V the low or - is connected to the MS The solenoid is PWM controlled through the ground side.

2. correct you only use the B & C selector inputs

3. You need to have TPS or MAP as a minimum for load. MAP may suit you best as you are going to run boost, but having both won't hurt

[gmto2nr]

For sake of documenting this.. in case someone else runs across this I have a few more questions..
Question #1

For using B and C selector inputs.. so
selector B on the trans side goes to pin 12 on the Megasquirt ( selector pos A )
selector C on the trans side goes to pin 11 on the Megasquirt ( selector pos B )
Correct?

Question #2

Using a switched 12 volt distribution block should work to power the 1-2,2-3 and pressure solenoid and TCC solenoid, correct?

Question #3

Will I require a pull up resistor or shunt on the VR signal for this application?

Question #4

Solenoid A on the Megasquirt goes to 1-2 shift solenoid
Solenoid B on the Megasquirt goes to the 2-3 shift solenoid

Correct?


Thanks for all the help! May write a tutorial and wiring diagram for this trans as I know a few people that would run it.

[Raymond_B]

For sake of documenting this.. in case someone else runs across this I have a few more questions..

Thanks for all the help! May write a tutorial and wiring diagram for this trans as I know a few people that would run it.

Just post it all up here and when verified James can add it to the docs. He keeps them up to date as possible.

[gmto2nr]

Will do!

Got a spread sheet built already, just the last of the questions!

[prof315]

For sake of documenting this.. in case someone else runs across this I have a few more questions..
Question #1

For using B and C selector inputs.. so
selector B on the trans side goes to pin 12 on the Megasquirt ( selector pos A )
selector C on the trans side goes to pin 11 on the Megasquirt ( selector pos B )
Correct? Yes

Question #2

Using a switched 12 volt distribution block should work to power the 1-2,2-3 and pressure solenoid and TCC solenoid, correct? Yes

Question #3

Will I require a pull up resistor or shunt on the VR signal for this application? Use a shunt if you are running a V3.0 Microsquirt otherwise nothing

Question #4

Solenoid A on the Megasquirt goes to 1-2 shift solenoid
Solenoid B on the Megasquirt goes to the 2-3 shift solenoid

Correct? Yes


Thanks for all the help! May write a tutorial and wiring diagram for this trans as I know a few people that would run it.

[gmto2nr]

Thanks for the help.

Did you ever get the trans temp to read correctly?

[prof315]

Yes I did, I was on the wrong wire coming from the trans initially.

[gmto2nr]

Thanks, I will let you know if I have any other questions..

I will work on the write up and pin outs for others and submit after it is working correctly.