DTC Troubleshooting: P0116 (86-1)

DTC P0116:  ECT Sensor Range/Performance Problem

1.Turn the ignition switch ON (II).

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

Is about 80 °C (176 °F) or higher or less indicated?


YES - Go to 3.


NO - Go to 7.


3.Note the current coolant temperature.

4.Turn the ignition switch OFF.

5.Cool the engine for 1 hour.

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

Did the ECT change 2 °C (3.6 °F) or more?


YES - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.n


NO - Go to 10.


7.Note the current coolant temperature.

8.Start the engine. Hold the engine speed at 2,000 rpm (min-1) without load (in neutral) until the radiator fan comes on, then let it idle.

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

Does the ECT change 2 °C (3.6 °F) or more?


YES - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.n


NO - Go to 10.

10.Turn the ignition switch OFF.

11.Cool the engine for 1 hour.

12.Replace the ECT sensor.

13.Turn the ignition switch ON (II).

14.Reset the ECM with the HDS.

15.Start the engine. Hold the engine speed at 2,000 rpm (min-1) without load (in neutral) until the radiator fan comes on, then let it idle 20 minutes.

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0116 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 - Go to 17.


17.Monitor the OBD STATUS for DTC P0116 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?


YES - Troubleshooting is complete.n


NO - If the screen indicates FAILED, check for poor connections or loose terminals at the ECT sensor and the ECM, then go to 1. If the screen indicates NOT COMPLETED, go to 15 and recheck.