DTC P0117: ECT Sensor Circuit Low Voltage
- Turn the ignition switch ON (II).
- Check the ECT with the scan tool.
Is 150°C (302°F) or higher (or H-Limit in Honda mode of PGM Tester) or 0 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. 
- Disconnect the ECT sensor 2P connector.
- Check the ECT with the scan tool.
Is 150°C (30°F) or higher (or H-Limit in Honda mode of PGM Tester) or 0 V indicated?
YES - Go to step 5.
NO - Replace the ECT sensor.
- Turn the ignition switch OFF.
- Disconnect ECM connector B (24P).
- Check for continuity between the ECT sensor 2P connector terminal No. 1 and body ground.
ECT SENSOR 2P CONNECTOR
Wire side of female terminals
Is there continuity?
YES - Repair short in the wire between the ECM (B8) and the ECT sensor.
NO - Substitute a known-good ECM and recheck (see page 11-5). If the symptom/indication goes away, replace the original ECM.