DTC Troubleshooting: P0118 (6-2)

DTC P0118:  ECT Sensor Cricuit High Voltage

1.Turn the ignition switch ON (II).

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

Is about 4.95 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.n


3.Turn the ignition switch OFF.

4.Disconnect the ECT sensor 2P connector.

5.Connect 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 4.95 V or higher indicated?


YES - Go to 8.


NO - Go to 18.

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

9.Measure voltage between ECT sensor 2P connector terminal No. 2 and body ground.

 

Is there about 5 V?


YES - Go to 10.


NO - Go to 14.


10.Turn the ignition switch OFF, and wait 30 seconds.

11.Disconnect ECM connector No. 1 (96P).

12.Connect ECT sensor 2P connector terminal No. 1 to body ground with a jumper wire.

 

13.Check for continuity between ECM connector No. 1 terminal No. 56 and body ground.

 

Is there continuity?


YES - Go to 24.


NO - Repair open in the wire between the ECT sensor and ECM connector No. 1 terminal No. 56, then go to 20.


14.Turn the ignition switch OFF, and wait 30 seconds.

15.Disconnect ECM connector No. 1 (96P).

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

 

17.Check for continuity between ECM connector No. 1 terminal No. 67 and body ground.

 

Is there continuity?


YES - Go to 24.


NO - Repair open in the wire between the ECT sensor and ECM connector No. 1 terminal No. 67, then go to step 20.


18.Turn the ignition switch OFF.

19.Replace the ECT sensor.

20.Reconnect all connectors.

21.Turn the ignition switch ON (II).

22.Reset the ECM with the HDS.

23.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, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Troubleshooting is complete.n


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

25.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, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


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