Low Input

DTC P0117: Low voltage in ECT Sensor Circuit
1. Turn the ignition switch ON (II).
2. check the ECT with the scan tool.
Is 302°F (150°C) 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 the ECM/PCM.
3. Disconnect the ECT sensor connector.
4. Check the ECT with the scan tool.
Is 302°F (150°C) 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.
5. Turn the ignition switch OFF.
6. Disconnect the ECM/PCM connector C (31P).




7. Check the continuity between the ECT sensor 2P connector terminal No.2 and body ground.
Is there continuity?
YES-Repair short in the wire between the ECM/ PCM (C26) and the ECT sensor.
NO-Substitute a known-good ECM/PCM and recheck. If normal ECT is indicated, replace the original ECM/PCM.
Diagnostic Strategies