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. 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 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 connector terminals A10 and B8 with a jumper wire. ECM CONNECTORS 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 and recheck (see page 11-5). If the symptom/indication goes away, replace the original ECM. NO - Repair open in the wire between the ECM (A10, B8) and the ECT sensor. aaa