Failed TC lockup switch, possibly something good?

[KeelinTy]

So the other day I made myself a switch panel. Gotta love 3d printing. One of the switches is a torque converter lockup switch 

 

Welp, it was getting dark and I tapped into the wrong line. I tapped into the apps wire. Oopsies. Orange and dark blue vs orange and black when it was starting to get dark out

 

Ended up running it on my commute to work today, about a 30 minute drive.

Surprisingly, the switch worked, just not as a lockup switch 

 

Turns out if you ground the apps wire, the truck will run properly, but the torque converter will hold whatever condition it was in when you flipped the switch

 

So if you flip it while it's unlocked - it stays unlocked through all gears

If you flip it while it's locked - stays locked (even unlocks when you hit the breaks)

 

Honestly I thought that was kinda cool

 

But my question would be, would running something like that cause any damage to the apps or pcm?

Once I realized my mistake after getting to work, I didn't use it on the way home 

 

I know a noise isolator adds a capacitor between the line and ground to reduce noise. But I'm not sure what completely grounding the wire would do 

 

 

Just an interesting little find I stumbled across and not sure if it's harmful or not 

 

 

Edit: 

Trucks a 1999 47re 

Edited October 10, 2019 by KeelinTy

[Mopar1973Man]

Personally I would connect it correctly. It might impact things that share that signal since it most likely shared by the ECM and PCM both. Typically lock up switch the relay is pulled and the power is constant to the transmission and your controlling the lock up solenoid with a ground signal on the orange and black wire. 

[KeelinTy]

7 hours ago, Mopar1973Man said:

Personally I would connect it correctly. It might impact things that share that signal since it most likely shared by the ECM and PCM both. Typically lock up switch the relay is pulled and the power is constant to the transmission and your controlling the lock up solenoid with a ground signal on the orange and black wire. 

I wired it up correctly this morning and for some reason it doesn't work 

 

I'm using relays for everything. But using a multimeter on continuity, once I flip the lockup switch, it grounds the cable. 

Is it because I'm going straight to the negative terminal of the battery? I wouldn't think it would be

 

I tapped into the orange with black stripe wire on the pcm as well as taking out the transmission relay and using a jumper

 

Any ideas? I flip the switch and it does nothing, in any gear. 

[pepsi71ocean]

51 minutes ago, KeelinTy said:

I wired it up correctly this morning and for some reason it doesn't work 

 

I'm using relays for everything. But using a multimeter on continuity, once I flip the lockup switch, it grounds the cable. 

Is it because I'm going straight to the negative terminal of the battery? I wouldn't think it would be

 

I tapped into the orange with black stripe wire on the pcm as well as taking out the transmission relay and using a jumper

 

Any ideas? I flip the switch and it does nothing, in any gear. 

 

Your 100% sure you have the right connector?

[KeelinTy]

2 minutes ago, pepsi71ocean said:

 

Your 100% sure you have the right connector?

it's connected to the orange and black wire coming off the center connector on the pcm. That's what all the instructions I've seen say to do

http://imgur.com/a/zJJaFSr

 

Resistance measured on my cheaper multimeter is between 18 and 30 ohms probing around on different spots 

 

18 at the battery terminal and 30 on the block

 

 

[Evan]

I think you need a jumper cable in the fuse box under the hood

[KeelinTy]

Just now, Evan said:

I think you need a jumper cable in the fuse box under the hood

Got that too, took out the transmission relay and used a jumper

[Evan]

Is it locking 2nd by grounding the apps?

[KeelinTy]

11 minutes ago, Evan said:

Is it locking 2nd by grounding the apps?

Nope. I didn't a little bit of basic testing today. I switched it back to the apps and hooked up my multimeter. At idle the wire reads .5v which was expected. Grounding it shows no current flow. 

 

When the apps is grounded. It will either keep the converter locked or unlocked. 

So if you're driving on the highway when it's locked, and you ground the apps, the converter will stay locked, unless you hit the brakes, or get back on the throttle and flip the switch off 

 

Same with unlocked. Stays unlocked until you get back on the throttle and flip the switch

 

A 30 minute drive yesterday with the apps grounded showed no issues, no check engine light or anything. Felt normal too. Other than me keeping my converter locked 

[Evan]

Somewhere in this website a guy put a resistor on the apps wire and it stay locked longer then with out.