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DTC P0117 - Engine Coolant Temperature (ECT) Sensor

  1. Turn ignition on. Using scan tool, check ECT. 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 in ECT circuits between ECT sensor connector and PCM connector. See WIRING DIAGRAMS  section.
  2. If 302°F (150°C) or more is indicated, disconnect ECT sensor connector. Using scan tool, check ECT. If 302°F (150°C) or more is not indicated, replace ECT sensor. If 302°F (150°C) or more is indicated, turn ignition off. Disconnect PCM connector "D". See Figure .
  3. Check for continuity between ECT connector Red/White wire and ground. If continuity exists, repair short in Red/White wire between ECT sensor and PCM connector terminal D2. See WIRING DIAGRAMS  section. 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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