Torque Converter Clutch Solenoid Valve

The Torque Converter Clutch Solenoid valve (TCC Sol valve) is an ON/OFF solenoid that functions in the same manner as the 1-2 shift solenoid valve and the 2-3 shift solenoid valve. As with the shift solenoids, the Powertrain Control Module (PCM) provides the ground to command the TCC Sol. valve ON or OFF. The only difference in operation is that ignition voltage is supplied through the normally closed brake switch to the solenoid.

When the solenoid is OFF, and if the transmission is operating in third or fourth gear, the TCC signal fluid exhausts through the solenoid. When energized (ON), the exhaust port is blocked. This allows the TCC signal fluid pressure to move the converter clutch valve against the spring force and the line pressure at the opposite end of the valve.

A scan tool can command the TCC. However, the PCM allows the TCC to be commanded OFF for a maximum of 10 seconds (assuming the PCM would otherwise command the TCC ON). This prevents transmission overheating during a scan tool operation with the TCC commanded OFF.