2. Check PSP Sensor Power Supply Circuit

WARNING: This page is about a different car, the 2004 Infiniti Q45. 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.
Check voltage between PSP sensor terminal 1 and ground with CONSULT-II or tester.
1. Voltage: Approximately 5V

OK or NG

OK : GO TO 4.

NG : GO TO 3.

Fig 1: Checking voltage between PSP sensor terminal 1 & ground

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