The Intermediate Shaft Speed Sensor is an electrical device whose function is to detect the speed at which the inlet turbine rotates. The ECM (Engine Control Module) compares the speed of the inlet turbine with the speed of the gearbox and in this way, the timing of the shifts can be determined to correctly regulate the hydraulic pressure and engine torque.
The P0792 OBD2 diagnostic code setting occurs when the ECM or TCM discovers that the Intermediate Shaft Speed Sensor circuit is out of range.