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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 .