WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
For CONSULT-II reference value in data monitor mode, see Fig 1 - Fig 2
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Fig 1: CONSULT-II Reference Value In Data Monitor Mode For EVAP Control System Pressure Sensor (2.5L)
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: CONSULT-II Reference Value In Data Monitor Mode For EVAP Control System Pressure Sensor (3.5L)