Torque converter lock up control 700R4
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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. | |
| − | + | [[Image:Diagram_no_tow.jpg|border|400px]] | |
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==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". | |
| − | The pressure switch with 1 pole | + | {| |
| − | + | |[[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.]] |
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==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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| + | [[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== | ||
| − | 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|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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| + | ==Resources== | ||
| + | *[http://www.dlcparts.com/images/BoschGuide.pdf Relay guide] | ||
[[Category:Transmission]] | [[Category:Transmission]] | ||
[[Category:Good articles]] | [[Category:Good articles]] | ||
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