Without CONSULT-II

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

Let engine idle.
Read the voltage signal between ECM terminals 60, 61, 62, 79, 80, 81 and ground with an oscilloscope.
Verify that the oscilloscope screen shows the signal wave as shown below.

Fig 1: Verify That The Oscilloscope Screen Shows The Signal Wave
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Voltage
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK : INSPECTION END
NG : GO TO 10.