Without CONSULT-II

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.

Let engine idle.
Read the voltage signal between ECM terminals 18, 19, 20, 21, 29, 30, 31, 32 and ground with an oscilloscope.

Fig 1: Checking Voltage Signal Between ECM Terminals & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
Verify that the oscilloscope screen shows the signal wave as shown below.

Fig 2: Oscilloscope Graph
Courtesy of NISSAN MOTOR CO., U.S.A.

NOTE: The pulse cycle changes depending on RPM at idle.

OK or NG

OK: INSPECTION END
NG: GO TO 11. CHECK CONDENSER CIRCUIT FOR OPEN AND SHORT .