On Board Diagnosis Logic
WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
This self-diagnosis has 1st trip detection logic. The MIL will not light up for this diagnosis. If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
For on board diagnosis logic, see Fig 1.