Torque converter lock up control 700R4
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==Basic wire diagram== | ==Basic wire diagram== | ||
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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. | |
| − | + | 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== | ||
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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" | |
| − | + | 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. | |
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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== | ||
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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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| + | 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]] | ||
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==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. | |
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| + | [[Image:700_v-body_switch.jpg]] | ||
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[[Category:Transmission]] | [[Category:Transmission]] | ||
[[Category:Good articles]] | [[Category:Good articles]] | ||
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