With GST

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.

Turn ignition switch ON.
Check voltage between ECM terminal 80 (PNP switch signal) and ground under the following conditions.

Fig 1: Checking Voltage Between ECM Terminal 80 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Inspecting Conditions Chart
Courtesy of NISSAN MOTOR CO., U.S.A.
If NG, go to DIAGNOSTIC PROCEDURE .