Theory Of Operation

WARNING: This page is about a different variant/trim than selected.

The torque converter contains an internal Torque Converter Clutch (TCC) which is controlled by the Transmission Control Module (TCM) to maintain slip (engine speed versus transmission input speed) to optimize fuel economy under specific speed and throttle conditions. For fault determination, the TCM monitors the amount of torque converter slip ONLY when the TCC is in Slip Mode operation. During Slip Mode, the slip speed is expected to be within a predetermined range. If the Torque Converter Clutch (TCC) does not receive adequate hydraulic pressure for any reason, or if the internal clutch is damaged, the TCC will not be able to control to the predetermined slip value. Therefore, if the torque converter slip is more than expected for a predetermined amount of time, the DTC will set.