On Board Diagnosis Logic

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

This is not an OBD-II self-diagnostic item.
TCM calculates the actual gear ratio with input speed sensor (primary speed sensor) and output speed sensor (secondary speed sensor).
Diagnostic trouble code "P0730 BELT DAMG" with CONSULT-II is detected, when TCM receives an unexpected gear ratio signal.