Torque Converter Clutch (TCC) Solenoid
The torque converter clutch (TCC) solenoid is used in the transaxle control system to control the application, modulation and release of the torque converter clutch.
The TCC control solenoid is installed on the front valve body. Based on engine RPM, throttle opening degree signals and speed sensor signals, it linearly controls clutch hydraulic pressure. Through this, engagement and slip are controlled. As a fail-safe function, if any control solenoid assembly abnormality occurs, the TCM will disable the current to the TCC solenoid.
Transmission Control (TC) Switch (MKZ)
The transmission control (TC) switch is a momentary contact switch that allows the driver to cancel operation of overdrive.
The TC switch is located on the selector lever.
When the driver initially presses the TC switch, a signal is sent to the PCM.
The PCM uses the shift solenoids to disengage/disable overdrive operation.
At the same time, the PCM illuminates the transmission control indicator lamp (TCIL) to notify the driver that overdrive is canceled.
When the TC switch is pressed again, overdrive operation is enabled, the converter clutch is released and the TCIL is turned OFF.
Whenever the ignition is cycled (vehicle shut OFF, then started again), the TC switch is turned OFF and overdrive will be enabled, even if the TC switch had been on when the ignition was shut off.
Transmission Control Indicator Lamp (TCIL)
The transmission control indicator lamp (TCIL) is located in the instrument panel and is labeled Overdrive OFF. It is illuminated in conjunction with the TC switch.