Editing Torque converter lock up control 700R4

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=Converter lock up wiring=

==Basic wire diagram==


When the brakes are applied the relay switches to pin 87 and the circuit is broken, thus opening the trans feed.


Common type  Bosch relay used



[[Image:Diagram_no_tow.jpg]]

This is a common 12 volt circuit.  12 volts to the solenoid and you need a ground to complete the circuit.  If you do not understand basic wiring, get some help from some person with the knowledge. 


[[image:700_connectors.jpg]]

==Pressure switches==

Notice these 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. Both of these pressure switches are "on -off" design. Pressure turns them 'on' , no pressure they are "off"

The pressure switch with 1 pole on it is self grounding. This means the wire you hook to it is to be grounded when pressure is applied to the switch.

[[Image:700_pressure_switches.jpg]]

==Lock up Solenoids==

Solenoid designs:  1 wire and common 2 wire.  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 converter clutch. this location has pressure when the trans is in 4th gear

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



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