DTC P0118 - Engine Coolant Temperature (ECT) Sensor
- Turn ignition on. Using scan tool, check ECT. If -4°F (-20°C) or less 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.
- If -4°F (-20°C) or less is indicated, disconnect ECT sensor connector. Install jumper wire between ECT harness connector terminals. Using scan tool, check ECT. If -4°F (-20°C) or less is not indicated, replace ECT sensor. If -4°F (-20°C) or less is indicated, turn ignition off.
- Install jumper wire between PCM connector terminals D2 and D11. Turn ignition on. Using scan tool, check ECT. If -4°F (-20°C) or less is not indicated, repair open in ECT and SG2 circuit between ECT sensor and PCM connector terminals D2 and D11. See WIRING DIAGRAMS section. If -4°F (-20°C) or less is indicated, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.