Torque Converter Clutch (TCC) Solenoid

The TCC solenoid connects to the adapter case valve body. When the solenoid de-energizes (Off), the solenoid spring force keeps the plunger against the fluid inlet port. This blocks the solenoid feed fluid pressure from entering the solenoid signal fluid circuit. With the plunger in this position, the solenoid signal fluid circuit is open to an exhaust port through the end of the solenoid. Without the solenoid signal fluid pressure, the TCC releases.

When the solenoid energizes (commanded on) by the TCM, the magnetic field in the coil moves the plunger against the solenoid spring force, away from the fluid inlet port, and blocks the exhaust port through the solenoid. This allows the solenoid feed fluid to flow through the solenoid, causing the signal fluid pressure to increase, thereby moving the TCC control valve into the apply position.

The TCC is normally applied in the 3rd and the 4th gears (but will apply in the 2nd gear on some models if transmission fluid temperatures become excessively high). The following conditions will cause the TCM to change the operating state of the solenoid:
- The TCC releases prior to all of the upshifts and downshifts and may reapply after the shift is complete if operating conditions are appropriate.
- The TCC is released when the brake pedal is depressed, as signaled to the TCM by the brake switch.
- Transmission fluid must be above approximately 30° C (86° F) before the TCM will signal TCC apply.
- Engine coolant temperature must be above approximately 70° C (158° F) before the TCM will signal TCC apply.
- In the event of an electrical or system failure the TCC solenoid remains off and the TCC released.