DTC P0120 - THROTTLE POSITION (TP) SENSOR Nissan Maxima A32

1. Check Ground Circuit Turn ignition off. Loosen and retighten engine ground screws. Disconnect TP sensor harness connector. See «REMOVE/INSTALL/OVERHAUL»(ref-17990) article for TP sensor location. Using an ohmmeter, check continuity between TP sensor harness connector terminal No. 3 (Black wire) and engine ground. If no continuity exists, repair open in Black wire. If continuity exists, go to next step.
2. Check Power Supply Turn ignition on. Using a voltmeter, measure voltage between TP sensor harness connector terminal No. 1 (Red wire) and ground. If voltage is not approximately 5 volts, repair fault in Red wire as required. If voltage is approximately 5 volts, go to next step.
3. Check Input Signal Circuit Turn ignition off. Disconnect ECM harness connector. see scheme 2 Using an ohmmeter, check continuity between TP sensor harness connector terminal No. 2 (White wire) and ECM harness connector terminal No. 23. see scheme 3 If no continuity exists, repair open in White wire. If continuity exists, go to next step.
4. Check Component Leave TP sensor disconnected. While opening and closing throttle, check resistance across TP sensor connector terminal No. 2 (White wire) and No. 3 (Black wire). (Scheme 7) See THROTTLE POSITION SENSOR RESISTANCE TEST table. If resistance is not as specified, adjust TP sensor. See ADJUSTMENTS article. If resistance is still not as specified after adjustment, replace TP sensor.

THROTTLE POSITION SENSOR RESISTANCE TEST (1)

Scheme 7