DTC 43: Throttle Position (TP) Sensor

1. Check Power Supply  - Turn ignition off and disconnect TP sensor harness connector. See Fig 1 . Turn ignition on. Measure voltage between TP sensor connector terminal "c" (Red/Yellow wire) and ground. See Fig 2 . If voltage is about 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. Check continuity between TP sensor connector terminal "a" (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. See Figure . Ensure continuity exists between ECM connector terminal No. 20 and TP sensor connector terminal "b" (White wire). See Figure and 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 in the ENGINE PERFORMANCE section. Replace TP sensor if necessary and perform FINAL CHECK  in this article. If TP sensor is okay, repair ECM pin terminals and/or wiring harness connector.

Fig 1: Locating TP Sensor Harness Connector (Altima)

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

Fig 2: DTC 43, Checking Power Supply (Altima)

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

Fig 3: DTC 43, Checking Ground Circuit (Altima)

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

Fig 4: DTC 43, Checking Input Signal Circuit (Altima)

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