Editing Torque converter lock up control 700R4

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=Converter lock up wiring=

==Basic wire diagram==
This is a simple 12 volt circuit. I consists of 12 volts to the solenoid and a ground to complete the circuit. 

When the brakes are applied the relay switches to pin 87 and the circuit is broken, thus unlocking the torque converter. A common Bosch relay used.   
    
If you do not understand basic wiring, get some help from someone with transmission/automotive wire knowledge. 

[[Image:Diagram_no_tow.jpg|border|400px]] <br style="clear:both"/>


==Pressure switches==
Notice these pressure switches are silver in color. This means they are NO = Normally Open. When pressure is applied, the switch closes the internal contacts to complete the circuit. All of these pressure switches are of an "on-off" design. Pressure turns them "on", no pressure turns them "off".





==Lock up solenoids==


*1 wire solenoid, early design
*more common 2-wire solenoid late design

Solenoid on the left has 1 red wire. This is a self-grounding lock up solenoid. The 2-wire solenoid has a red wire and a black wire. Red is for 12 volts, black is for ground.

[[image:700_solenoid_wires.jpg]]


==Valve body location for switch==

Location for pressure switch on valve body for 4th gear lockup only of the torque converter clutch (TCC). This location has pressure when the transmission is in 4th gear. 


[[Image:700_v-body_switch.jpg]]



[[Category:Transmission]]
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