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DTC P0117 - ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOW VOLTAGE INPUT Honda Prelude V

Testing & Diagnostics ~165 words
  1. Turn ignition on. Using OBD-II scan tool, check ECT sensor. If 302°F (150°C) or more is indicated, go to next step. If 302°F (150°C) or more is not indicated, problem is intermittent. System is okay at this time. Check for poor connections or loose wires between ECT sensor connector and PCM connector. See «WIRING DIAGRAMS»(ref-16355) article.
  2. Disconnect ECT sensor 2-pin connector. Using OBD-II scan tool, check ECT sensor. If 302°F (150°C) or more is indicated, go to next step. If 302°F (150°C) or more is not indicated, replace ECT sensor. 3) Turn ignition off. Disconnect PCM 16-pin connector "D". Check for continuity between ground and ECT sensor harness connector terminal No. 2 (Red/White wire). If continuity exists, repair short in Red/White wire between ECT sensor and PCM connector terminal D2. 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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