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1. Check Electric Throttle Control Actuator Visually

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch OFF.
  2. Remove the intake air duct.
  3. Check if foreign matter is caught between the throttle valve and the housing.

OK or NG 

  1. OK: GO TO 2.
  2. NG: Remove the foreign matter and clean the electric throttle control actuator inside.
Fig 1: Cleaning The Electric Throttle Control Actuator Inside
G00877450Courtesy of NISSAN MOTOR CO., U.S.A.