Torque Converter Lock Up Switch

[2manyfords]

Installing a Torque Converter lock up switch.

The lock up TC circuit is a ground switching system. The ECU grounds
the circuit to control the operation of the TC. So in order to install a
switch to force lockup all you have to do is hook up a grounding circuit.

Locate pin #53 on the ECU. They are numbered on the ECU.

Tapp into the pin #53 wire in the engine management harness.

Run a wire from the pin #53 wire to a switch, then from the other side of the
switch to a good ground. I ran mine to the negative battery terminal.

Note: Haynes manual says the wire is Pink and Yellow but mine is Orange. You can
verify the wire color by looking at the TC plug on the transmission.

Now you can control lock up. When the switch is in the on position the lock will stay
locked up regardless of engine load as long as the transmission is in 3rd or OD.

When the switch is in the off position the lock up will operated as it always did.

Note: There is no lock up in first or second. The valve body overrides it in
those ranges. Also remember to turn the switch off when comming to a stop or the
engine will lug down until the transmission drops out of 3rd gear.

 

[metalmacguyver]

 

[bikerboy]

i know you posted this awhile ago but what are the advantages to this?

 

[2manyfords]

i know you posted this awhile ago but what are the advantages to this?

You can force the TC to stay locked in 3rd and OD.

When you take your foot off the gas in 3rd or OD the TC unlocks and then relocks once the gas pedal is pushed down.

IMO this causes un neccesary wear and heat. With this switch set up once turned on the TC will not unlock until you either turn it off or shift into 2nd gear.

 

[big91explorer]

Would this work for the 3-4 shift solenoid as well?

 

[big91explorer]

Anybody?

I want to try it for the 3/4 shift solenoid to try and diagnose the problem. I think the ECM may be bad, 'cause I checked the wires, and they seem like they should be intact.

Does anybody know if doing this will hurt anything?

 

[1999-Intruder]

I have a question about this setup. Which automatic transmissions will this work with?

 

[Derek_Z10]

I want to do this with my 2004 Ford Ranger. It is 4.0L 4x4 XLT with automatic 5 speed. I looked at the wiring harness and pin #53's wire is a different color than you mentioned. Is pin 53 always the right pin to connect to?

I tried to verify the wire but I don't know what or where the TC plug is.

Also you say this works in 3rd and OD. What happens in 4th gear?

Thank you and I would really appreciate help. I would really like to up my fuel econ this way.

 

[mikey09120]

Can this work with my 2007 Ranger Edge 2wd? Automatic trans. Is pin#53 still the correct one to tap into?