CANTCU CAN3 is connected to Td5 CAN
In some cases, without proper engine tuning, the torque value sent by the ECU can be too low, resulting in spongy/slow shifts. The torque correction factor can be used to adjust this torque value if needed (percentage correction). The torque correction factor is just a band-aid meant to be used as last resort. The right way is to have the engine report correct torque even when tuned.