P0117
DTC P0117: ECT Sensor Circuit Low Voltage1. Turn the ignition switch ON (II).
2. Check the ECT SENSOR in the DATA LIST with the HDS.
Is 302 °F (150 °C) or higher, or 0 V indicated?
YES - Go to step 3.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and at the ECM.
3. Disconnect the ECT sensor 2P connector.
4. Check the ECT SENSOR in the DATA LIST with the HDS.
Is 302 °F (150 °C) or higher, or 0 V indicated?
YES - Go to step 5.
NO - Replace the ECT sensor.
5. Turn the ignition switch OFF.
6. Wait for 1 minute. If the radiator fan is running, wait for 1 minute after it stops.
7. Disconnect ECM connector B (24P).
8. Check for continuity between ECT sensor 2P connector terminal No.2 and body ground.
Is there continuity?
YES - Go to step 9.
NO - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
9. Disconnect the climate control unit 30P connector.
10. Check for continuity between ECT sensor 2P connector terminal No.2 and body ground.
Is there continuity?
YES -
- Go to step 11 (CVT model).
- Repair short in the wire between the ECM (B8) and the ECT sensor (M/T model).
NO - Substitute a known-good climate control unit and recheck.
11. Disconnect TCM connector C (17P).
12. Check for continuity between ECT sensor 2P connector terminal No.2 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (B8), TCM (C11), and the ECT sensor.
NO - Update the TCM if it does not have the latest software, or substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM.