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DTC P0118: ENGINE COOLANT TEMPERATURE (ECT) SENSOR HIGH VOLTAGE INPUT Honda Civic GA

Testing & Diagnostics ~328 words
  1. Turn ignition on. Check ECT using scan tool. If -4°F (-20°C) or less, or 5 volts is indicated, go to next step. If -4°F (-20°C) or less, or 5 volts is not indicated, problem is intermittent. System is okay at this time. Check for poor connections or loose wires at ECT sensor and PCM connectors. See appropriate wiring diagram in WIRING DIAGRAMS article.
  2. Disconnect ECT sensor connector. Install a fused jumper wire between ECT harness connector terminals. Check ECT using scan tool. If -4°F (-20°C) or less, or 5 volts is indicated, go to next step (D16Y5 engine with M/T), or go to step 4 (except D16Y5 engine with M/T). If -4°F (-20°C) or less, or 5 volts is not indicated, replace ECT sensor.
  3. On D16Y5 engine with M/T, turn ignition off. Using backprobe set, install a fused jumper wire between PCM 16-pin connector "D" terminals No. 2 (Red/White wire) and No. 11 (Green/Black wire). (Схема №4) Turn ignition on. Check ECT using scan tool. If -4°F (-20°C) or less, or 5 volts is not indicated, check for open in suspect wire between ECT sensor and PCM 16-pin connector "D". See appropriate wiring diagram in WIRING DIAGRAMS article. 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.
  4. On all except D16Y5 engine with M/T, turn ignition off. Using backprobe set, install a fused jumper wire between PCM 31-pin connector "C" terminals No. 18 (Green/Black wire) and No. 26 (Red/White wire). (Схема №3) Turn ignition on. Check ECT using scan tool. If -4°F (-20°C) or less, or 5 volts is not indicated, check for open in suspect wire between ECT sensor and PCM 31-pin connector "C". See appropriate wiring diagram in WIRING DIAGRAMS article. 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.

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