2. Check PSP Sensor Power Supply Circuit

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect power steering pressure (PSP) sensor harness connector.
Turn ignition switch ON.

Fig 1: Identifying Power Steering Pressure (PSP) Sensor Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.
Check voltage between PSP sensor terminal 1 and ground with CONSULT-II or tester.

Fig 2: Checking Voltage Between PSP Sensor Terminal 1 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Voltage: Approximately 5V

OK or NG

OK: GO TO 4. CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT .
NG: GO TO 3.