On Board Diagnosis Logic

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. 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 "P0720 VEH SPD SEN/CIR AT" with CONSULT-II or 1st judgement flicker without CONSULT-II is detected under the following conditions.

When TCM does not receive the proper voltage signal from the sensor.
After ignition switch is turned "ON", irregular signal input from vehicle speed sensor MTR before the vehicle starts moving.