Circuit Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The torque converter clutch (TCC) power transfer capacity is controlled by the balance of automatic transmission fluid (ATF) supply, and discharges to and from the torque converter. As hydraulic pressure in the internal pressure side increases, the power transfer capacity of the TCC increases. The direction of hydraulic pressure supply is switched by TCC solenoid valve and the lock-up shift valve. When the powertrain control module (PCM) commands the TCC enable solenoid valve ON, 12 V, the ATF is supplied from the internal pressure side. When the PCM commands the TCC enable solenoid valve OFF, 0 V, the ATF is supplied from the back pressure side. The balance of internal pressure and back pressure is controlled by the combination of the clutch pressure control (PC) solenoid valve, the lock-up control valve and the lock-up timing valve. The TCC PC solenoid valve maximizes the TCC power transfer capacity when the PCM command is ON, 100%, and it minimizes the TCC power transfer capacity when the PCM command is OFF, 0%.

If the proportion of engine speed and transmission input speed is not approximately 1, while the PCM is commanding the TCC enable solenoid valve and the TCC PC solenoid valve ON, DTC P0741 sets. DTC P0741 is a type B DTC.