DTC P0118: ENGINE COOLANT TEMPERATURE (ECT) SENSOR HIGH VOLTAGE INPUT Honda CR-V I

1. Turn ignition on. Check ECT using scan tool. If -4°F (-20°C) or less is indicated, go to next step. 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 at ECT sensor connector and PCM connector. See the «WIRING DIAGRAMS»(ref-16319) article.
2. Disconnect ECT sensor connector. Install jumper wire between ECT harness connector terminals. Check ECT using scan tool. If -4°F (-20°C) or less is indicated, go to next step. If -4°F (-20°C) or less is not indicated, replace ECT sensor.
3. Turn ignition off. Install jumper wire between PCM 16-pin connector "D" terminal D2 and terminal D11. Turn ignition on. Check ECT using scan tool. If -4°F (-20°C) or less is not indicated, repair open in wire(s) between ECT sensor and PCM connector terminals. See the «WIRING DIAGRAMS»(ref-16319) 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.

Scheme 8

1. Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral, until radiator fan comes on. Turn ignition off. Turn ignition on. Using scan tool, check throttle position. If reading is not approximately 10% with throttle fully closed and 90% with throttle fully opened, go to next step. If reading is as specified, problem is intermittent. System is okay at this time. Check for poor connections or loose wires at TP sensor connector and PCM connector. See the «WIRING DIAGRAMS»(ref-16319) article.
2. Turn ignition off. Disconnect TP sensor 3-pin connector. Turn ignition on. Measure voltage between TP sensor harness connector terminal No. 1 and terminal No. 3. (Scheme 8) If reading is not approximately 5 volts, go to next step. If reading is approximately 5 volts, go to step 4).
3. Measure voltage between PCM connector "D" terminal D10 and terminal D11. see scheme 2 If reading is approximately 5 volts, repair open in wire between PCM connector terminal D10 and TP sensor terminal. See the «WIRING DIAGRAMS»(ref-16319) article. If reading is not approximately 5 volts, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.
4. Turn ignition off. Measure resistance between TP sensor terminals No. 1 and No. 2 with throttle fully closed. (Scheme 8) If resistance is approximately 500-900 ohms, go to next step. If resistance is not as specified, replace TP sensor.
5. Measure resistance between TP sensor terminals No. 2 and No. 3 with throttle fully closed. If resistance is approximately 4500 ohms, go to next step. If resistance is not as specified, replace throttle body (TP sensor is not serviced separately).
6. Reconnect TP sensor. Turn ignition on. Measure voltage between PCM connector "D" terminal D1 and terminal D11. see scheme 2 If voltage is approximately 0.5 volt with throttle fully closed and 4.5 volts with throttle fully open, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM. If voltage is not as specified, repair short in wire between PCM connector terminal D1 and TP sensor.