DTC Troubleshooting: P0117 (6)

DTC P0117:  ECT Sensor Circuit Low Voltage

1.Turn the ignition switch ON (II).

2.Check the ECT SENSOR in the DATA LIST with the HDS.

Is about 180 °C (356 °F) or higher, or 0.08 V or less 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 the ECM/PCM.n


3.Turn the ignition switch OFF.

4.Disconnect the ECT sensor 2P connector.

5.Turn the ignition switch ON (II).

6.Check the ECT SENSOR in the DATA LIST with the HDS.

Is about 180 °C (356 °F) or higher, or 0.08 V or less indicated?


YES - Go to 7.


NO - Go to 11.


7.Turn the ignition switch OFF.

8.Jump the SCS line with the HDS.

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

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

 

Is there continuity?


YES - Repair short in the wire between the ECT sensor and ECM/PCM (B8), then go to 13.


NO - Go to 18.


11.Turn the ignition switch OFF.

12.Replace the ECT sensor.

13.Reconnect all connectors.

14.Turn the ignition switch ON (II).

15.Reset the ECM/PCM with the HDS.

16.Do the ECM/PCM idle learn procedure.

17.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0117 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Troubleshooting is complete.n


18.Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

19.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0117 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n