Editing Torque converter lock up control 700R4

{{youcanedit}}

=Converter lock up wiring=

==Basic wire diagram==
This is a simple 12 volt circuit. 12 volts to the solenoid and you need 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]]


==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". 

{|
|[[Image:700_pressure_switches.jpg|thumb|350px|left|The pressure switch with 1 pole is self-grounding. This means the wire you hook to it is going to be grounded when pressure is applied to the switch.]]
|[[image:700_connectors.jpg|thumb|400px|left|Pressure switch with two post connectors. This routes the 12 volt power through the switch to a single wire lock up solenoid.]]
|}

==Lock up solenoids==
===Types of lock up solenoids===
*1 wire solenoid, early design
*More common 2-wire solenoid, late design

[[image:700_solenoid_wires.jpg|thumb|400px|left|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.]]<br style="clear:both"/>

==Valve body location for switch==

[[Image:700_v-body_switch.jpg|thumb|400px|left|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.]]<br style="clear:both"/>

==Resources==
*[http://www.dlcparts.com/images/BoschGuide.pdf Relay guide]

[[Category:Transmission]]
[[Category:Good articles]]