With GST

Turn ignition switch ON.
Check voltage between ECM terminal 102 and body ground under the following conditions.

Fig 1: PNP Switch Condition And Voltage Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Voltage Between ECM Terminal 102 And Body Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
If NG, go to "DIAGNOSTIC PROCEDURE " .