With GST

Start engine and warm it up to normal operating temperature.
Check the voltage between ECM terminal 28 (Closed throttle position switch signal) and ground under the following conditions.

Fig 1: Voltage Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

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