Torque Converter Does Not Lock Up
WARNING: This page is about a different car, the 2002 Infiniti QX4, 2001 Nissan Pathfinder, and 2001 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.
Possible cause: incorrect TP sensor or PNP switch adjustment, line pressure or engine RPM signal, or faulty revolution sensor or VSS signal, TCC solenoid valve, fluid temperature sensor, valve body assembly or torque converter.