DTC Troubleshooting: P0118 (6)

DTC P0118:  ECT Sensor Circuit High Voltage

1.Turn the ignition switch ON (II).

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

Is about -40 °C (-40 °F) or less, or 4.90 V or higher 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.Connect the ECT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.

 

6.Turn the ignition switch ON (II).

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

Is about -40 °C (-40 °F) or less, or 4.90 V or higher indicated?


YES - Go to 8.


NO - Go to 18.

8.Turn the ignition switch OFF.

9.Remove the jumper wire from ECT sensor 2P connector.

10.Turn the ignition switch ON (II).

11.Measure voltage between the ECT sensor 2P connector terminal No. 1 and body ground.

 

Is there about 5 V?


YES - Go to 12.


NO - Go to 17.


12.Turn the ignition switch OFF.

13.Jump the SCS line with the HDS.

14.Disconnect the ECM/PCM connector A (31P).

15.Connect the ECT sensor 2P connector terminal
No. 2 to body ground with a jumper wire.

 

16.Check for continuity between ECM/PCM connector terminal A23 and body ground.

 

Is there continuity?


YES - Go to 25.


NO - Repair open in the wire between the ECM/PCM (A23) and ECT sensor, then go to 20.


17.Measure voltage between ECM/PCM connector terminal B8 and body ground.

 

Is there about 5 V?


YES - Repair open in the wire between the ECM/PCM (B8) and the ECT sensor, then go to 20.


NO - Go to 25.

18.Turn the ignition switch OFF.

19.Replace the ECT sensor.

20.Rconnect all connectors.

21.Turn the ignition switch ON (II).

22.Reset the ECM/PCM with the HDS.

23.Do the ECM/PCM idle learn procedure.

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0118 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 - Troubleshooting is complete.n


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

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0118 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