Torque Converter Clutch

Torque Converter Clutch

The torque converter connects the engine flywheel to the transmission input shaft. To increase fuel economy and to reduce emissions the TCM can lock the torque converter to give direct drive from the flywheel to the transmission input shaft.

The function of the torque converter diagnostic is to identify when the torque converter has not locked when requested to do so, by the TCM. The monitor runs continuously when TCC is requested.

The monitor starts by checking the TCC pressure, if this is above a predefined threshold and the level of clutch slip is also above its predefined threshold then status of the ISS sensor is checked. If the status is OK and the engine torque is below its predefined threshold, then a fault timer will start. If the conditions still exist after the fault timer has reached a defined period then the fault is logged and the monitor ends.