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Turn ignition switch ON.
Check voltage between ECM terminal 44 (PNP switch signal) and ground under the following conditions.

Fig 1: Voltage Table
Courtesy of NISSAN MOTOR CO., U.S.A.
If NG, go to "DIAGNOSTIC PROCEDURE ".

Fig 2: Checking Voltage Between Terminal 44 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.