DTC Troubleshooting: P0117 (6-1)

DTC P0117 (6-1):  ECT Sensor Circuit Low Voltage

1.Turn the ignition switch ON (II).

2.Check the ECT with the HDS or the scan tool.

Is 150°C (302°F) or higher, or about 0 V indicated?


YES - Go to 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/PCM.n


3.Disconnect the ECT sensor 2P connector.

4.Check the ECT with the HDS or the scan tool.

Is 150°C (302°F) or higher, or about 0 V indicated?


YES - Go to 5.


NO - Replace the  ECT sensor.n


5.Turn the ignition switch OFF.

6.Disconnect ECM/PCM connector B (24P).

7.Check for continuity between the ECT sensor 2P connector terminal No. 1 and body ground.

 

Is there continuity?


YES - Repair short in the wire between the ECM/PCM (B8) and the ECT sensor.n


NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original  ECM/ PCM.n