On Board Diagnosis Logic
WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.
- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0731 A/T 1ST GR FNCTN" is detected when TCM detects any inconsistency in the actual gear ratio.