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DTC P0123 - THROTTLE POSITION (TP) SENSOR HIGH VOLTAGE INPUT Honda Civic VI

Testing & Diagnostics ~212 words
  1. Turn ignition off. Turn ignition on. Check TP sensor using OBD-II scan tool. If reading is not about 10 percent with throttle fully closed and 90 percent with throttle fully opened, go to next step. If reading is about 10 percent with throttle fully closed and 90 percent with throttle fully opened, problem is intermittent. System is okay at this time. Check for poor connections or loose wires at TP sensor connector and PCM connector. See «WIRING DIAGRAMS»(ref-16355) article.
  2. Turn ignition off. Disconnect TP sensor 3-pin connector. Turn ignition on. Measure voltage between TP sensor harness connector terminals No. 1 (Green/Black wire) and No. 3 (Yellow/Blue wire). (Схема №6) If about 5.0 volts does not exist, go to next step. If about 5. 0 volts exists, replace throttle body (TP sensor is not serviced separately).
  3. Using backprobe kit, measure voltage between PCM 16-pin connector "D" terminal D10 (Yellow/Blue wire) and terminal D11 (Green/Black wire) on all other models. (Схема №4) If about 5.0 volts exists, repair open in Green/Black wire between PCM connector and TP sensor. See «WIRING DIAGRAMS»(ref-16355) article. If about 5.0 volts does not exist, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.

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