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DTC P0112 - INTAKE AIR TEMPERATURE (IAT) SENSOR LOW VOLTAGE INPUT Honda Prelude V

Testing & Diagnostics ~193 words
  1. Turn ignition on. Using OBD-II scan tool, check IAT sensor. If 302°F (150°C) or more is displayed, go to next step. If 302°F (150°C) or more is not displayed, check if ambient air temperature is displayed. If engine is warm, displayed temperature will be higher than ambient air temperature. If ambient air temperature is not displayed, replace IAT sensor. If ambient air temperature is displayed, failure is intermittent. Check for poor connections or loose wires between IAT sensor connector and PCM connector. See «WIRING DIAGRAMS»(ref-16355) article.
  2. Disconnect IAT sensor. Check IAT sensor using OBD-II scan tool. If 302°F (150°C) or more is displayed, go to next step. If 302°F (150°C) or more is not displayed, replace IAT sensor.
  3. Turn ignition off. Disconnect PCM 16-pin connector "D". (Схема №4) Check for continuity between ground and IAT sensor connector terminal No. 2 (Red/Yellow wire). If continuity exists, repair short in Red/Yellow wire between IAT sensor and PCM connector terminal D8. See «WIRING DIAGRAMS»(ref-16355) article. If continuity does not exist, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.

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