DTC Troubleshooting

DTC Troubleshooting: P0116, P0116

DTC P0116:

ECT Sensor 1 Circuit Range/Performance Problem

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

2. Check ECT SENSOR 1 in the DATA LIST with the HDS.

Is about 176 °F (80 °C) or more, or 0.78 V or less indicated?

YES -

Go to step 6.

NO -

Go to step 3.

3. Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.

4. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

5. Check ECT SENSOR 1 in the DATA LIST with the HDS.

Does ECT SENSOR 1 change 18 °F (10 °C) or more?

YES -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the ECM/PCM.

NO -

Go to step 11.

6. Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.

7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

8. Open the hood, and let the engine cool for 3 hours.

9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

10. Check ECT SENSOR 1 in the DATA LIST with the HDS.

Does ECT SENSOR 1 change 18 °F (10 °C) or more?

YES -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the ECM/PCM.

NO -

Go to step 11.

11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

12. Replace ECT sensor 1 ECT Sensor 1 Replacement.

13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

14. Reset the ECM/PCM with the HDS.

15. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure.

16. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0116 indicated?

YES -

Check for poor connections or loose terminals at ECT sensor 1 and the ECM/PCM, then go to step 1.

NO -

Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.