DTC P0118: ECT Sensor Circuit High Voltage Turn the ignition switch ON (II). Check the ECT with the scan tool. Is -20°C (-4°F) or less (or L-Limit in Honda mode of PGM Tester) or 5 V indicated? YES - Go to step 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the ECT sensor and at the ECM/PCM. Turn the ignition switch OFF. Disconnect the ECT sensor 2P connector. Connect the ECT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire. ECT SENSOR 2P CONNECTOR JUMPER WIRE Wire side of female terminals Turn the ignition switch ON (II).

Check the ECT with the scan tool. Is -20°C (-4°F) or less (or L-Limit in Honda mode of PGM Tester) or 5 V indicated? YES - Go to step 8. NO - Replace the ECT sensor. Turn the ignition switch OFF. Remove the jumper wire. Connect ECM/PCM connector terminals A10 and B8 with a jumper wire. ECM/PCM CONNECTORS JUMPER WIRE Wire side of female terminals Turn the ignition switch ON (II). Check the ECT with the scan tool. Is -20°C (-4°F) or less (or L-Limit in Honda mode of PGM Tester) or 5 V indicated? YES - Substitute a known-good ECM/PCM and recheck (see page 11-313). If symptom/indication goes away, replace the original ECM/PCM. NO - Repair open in the wire between the ECM/PCM (A10, B8) and the ECT sensor.