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Home >> Infiniti >> 1996 >> I30 Base, Standard, RS5F50A >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes 3.0L >> Circuit Tests >> DTC P0120 - Throttle Position (TP) Sensor
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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" (Red 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 Figure. 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 BASIC TESTING or SYSTEM/COMPONENT TESTS article. Replace TP sensor if necessary and perform FINAL CHECK .
Fig 1: Locating TP Sensor Harness Connector (I30)
G96H10568Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: DTC P0120, Checking Power Supply (I30)
G96I10569Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: DTC P0120, Checking Ground Circuit (I30)
G96B10570Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 4: DTC P0120, Checking Input Signal Circuit (I30)
G96C10571Courtesy of NISSAN MOTOR CO., U.S.A.
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