DTC Troubleshooting: 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.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0116 ECT Sensor 1 Circuit Range/Performance Problem
     

1.
ECT sensor 1 check:

ECT sensor 1 check
?1.
Press the engine start/stop button to select 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
    

Do the current condition(s) match the threshold?

     
YES
     
     
     
Note the value of ECT SENSOR 1, then go to step 3.
     
NO
     
     
     
Note the value of ECT SENSOR 1, then go to step 2.
2.
Problem verification (low temperature):

Problem verification (low temperature)
?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. 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.

?3.
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.?
     
NO
     
     
     
The failure is duplicated. Replace ECT sensor 1, then do the repair verification.
3.
Problem verification (high temperature):

Problem verification (high temperature)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Open the hood, and let the engine cool for 3 hours.

?3.
Press the engine start/stop button to select the ON mode.

?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.?
     
NO
     
     
     
The failure is duplicated. Replace ECT sensor 1, then do the repair verification.
Repair verification:

?1.
Press the engine start/stop button to select the ON mode.

?2.
Reset the PCM with the HDS.


?3.
Do the PCM idle learn procedure.

?4.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0116 ECT Sensor 1 Circuit Range/Performance Problem
     


Is DTC P0116 indicated?

     
YES
     
     
     
Check for poor connections or loose terminals at ECT sensor 1 and the 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. ?