DTC P0120 - Throttle Position (TP) Sensor

1. Check Power Supply
   
   Turn ignition off. Disconnect TP sensor harness connector. See Fig 1. Turn ignition on. Measure voltage between TP sensor connector terminal "1" (Green wire) and ground. See Fig 2. If voltage is approximately 5 volts, go to next step. If voltage is not as specified, repair harness or connectors as necessary.
2. Check Ground Circuit
   
   Turn ignition off. Verify harness continuity between TP sensor connector terminal "3" (Black wire) and engine ground. See Fig 3. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
3. Check Input Signal Circuit
   
   Disconnect ECM harness connector. Verify harness continuity between ECM connector terminal No. 23 (White wire) and TP sensor connector terminal "2". See Fig 4. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
4. Check Component
   
   Inspect TP sensor. See SYSTEM/COMPONENT TESTS article. Replace TP sensor if necessary and perform FINAL CHECK .

Fig 1: Locating TP Sensor & Harness Connector (J30)

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

Fig 2: DTC P0120, Checking Power Supply (J30)

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

Fig 3: DTC P0120, Checking Ground Circuit (J30)

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

Fig 4: DTC P0120, Checking Input Signal Circuit (J30)

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