Torque converter lock up control 700R4

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(Undo revision 21962 by Cobalt327 (Talk))
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==Basic wire diagram==
 
==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.  
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When the brakes are applied the relay switches to pin 87 and the circuit is broken, thus opening the trans feed.
  
[[Image:Diagram_no_tow.jpg|border|400px]]
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Common type Bosch relay used.
  
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[[Image:Diagram_no_tow.jpg]]
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This is a simple 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 someone with transmission / automotive wire knowledge.
  
 
==Pressure switches==
 
==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".
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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"
  
{|
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The pressure switch with 1 pole on it 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_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.]]
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|[[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.]]
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[[Image:700_pressure_switches.jpg]]
|}
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Photo of a pressure switch with two post connectors. This routes the 12 volt power through the switch to a single wire lock up solenoid.
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[[image:700_connectors.jpg]]
  
 
==Lock up solenoids==
 
==Lock up solenoids==
===Types of lock up solenoids===
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*1 wire solenoid, early design
 
*1 wire solenoid, early design
*More common 2-wire solenoid, late design
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*more common 2-wire solenoid late design
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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.
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[[image:700_solenoid_wires.jpg]]
  
[[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==
 
==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"/>
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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.  
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[[Image:700_v-body_switch.jpg]]
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==Resources==
 
*[http://www.dlcparts.com/images/BoschGuide.pdf Relay guide]
 
  
 
[[Category:Transmission]]
 
[[Category:Transmission]]
 
[[Category:Good articles]]
 
[[Category:Good articles]]

Revision as of 07:12, 26 March 2012

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