DTC P0734: A/T 4TH Gear Function: Description: Notes

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This malfunction will not be detected while the O/D OFF indicator lamp is indicating another self-diagnosis malfunction.
This malfunction is detected when the A/T does not shift into fourth gear position as instructed by the TCM, or if the line pressure is low. This is not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as control valve sticking, improper solenoid valve operation, malfunctioning oil pump or torque converter clutch, etc.

Fig 1: Gear And Shift Solenoid Valve Positions Chart

Courtesy of NISSAN MOTOR CO., U.S.A.