DTC Troubleshooting: P0115, P0116
DTC P0115: ECT Sensor 1 Out of Range
DTC P0116: ECT Sensor 1 Circuit Range/Performance Problem
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0115 ECT Sensor 1 Out of Range
    
P0116 ECT Sensor 1 Circuit Range/Performance Problem
   

1.
Problem verification 1:

Problem verification 1
?1.
Turn the vehicle to the ON mode.

?2.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
ECT SENSOR 1
More than 176
°F
    
More than 80
°C

Do the current condition(s) match the threshold?

     
YES
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
     
NO
     
     
     
Go to step 2.
2.
Problem verification 2:

Problem verification 2
?1.
Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
Signal
Current conditions
Values
Unit
ECT SENSOR 1
    

?2.
Start the engine.

?3.
Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

?4.
Check ECT SENSOR 1 in the DATA LIST with the HDS.
Signal
Current conditions
Values
Unit
ECT SENSOR 1
    

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 PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
     
NO
     
     
     
The failure is duplicated. Replace ECT sensor 1.?