2. Check Throttle Position Sensor Power Supply Circuit

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.

Disconnect electric throttle control actuator harness connector.
Turn ignition switch ON.

Fig 1: Disconnect Electric Throttle Control Actuator Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.
Check voltage between electric throttle control actuator terminal 1 and ground with CONSULT-II or tester.
1. Voltage: Approximately 5V

OK or NG

OK : GO TO 3.
NG : Repair open circuit or short to ground or short to power in harness or connectors.

Fig 2: Check Voltage

Courtesy of NISSAN MOTOR CO., U.S.A.