DTC Troubleshooting: P1116
DTC P1116: 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.
If DTC P0111 is stored at the same time as DTC P1116, troubleshoot DTC P0111 first, then recheck for DTC P1116.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P1116 ECT Sensor 1 Circuit Range/Performance Problem
      

1.
Connector visual check:

Connector visual check
?1.
Check for poor connections or loose terminals at these parts:
ECT sensor 1
ECT sensor 2

Are the connections and terminals OK?

     
YES
     
     
     
The parts are OK. Go to step 2.
     
NO
     
     
     
Repair the connections or terminals, then do the repair verification.
2.
PGM-FI system check:

PGM-FI system check
?1.
Press the engine start/stop button to select the ON mode.

?2.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P1116 ECT Sensor 1 Circuit Range/Performance Problem
      
P2183 ECT Sensor 2 Circuit Range/Performance Problem
     

Are DTC P1116 and P2183 indicated at the same time?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Only DTC P1116 is indicated. Go to step 3
3.
ECT sensor 1 performance check:

ECT sensor 1 performance check
?1.
Start the engine, and let it idle for 10 minutes.

?2.
Check the parameter(s) below with the HDS.
Signal
Malfunction Threshold
Current conditions
Values
Unit
Values
Unit
ECT SENSOR 1
Less than 108
°F
    
Less than 42
°C

Do the current condition(s) match the malfunction threshold?

     
YES
     
     
     
     
NO
     
     
     
ECT sensor 1 is OK at this time. Go to step 4.
4.
Problem verification:

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

?2.
Allow ECT sensor 1 and the engine to cool to the ambient temperature.

?3.
Note the ambient temperature.

?4.
Press the engine start/stop button to select the ON mode.

?5.
Quickly note the value of the ECT SENSOR 1 in the DATA LIST with the HDS.
Signal
Current conditions
Values
Unit
ECT SENSOR 1
    

?6.
Compare the value of ECT SENSOR 1 with the ambient temperature.

Does the value of ECT SENSOR 1 differ 5.4 °F (3 °C) or more from the ambient temperature?

     
YES
     
     
     
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.?
5.
ECT sensor 1 performance check:

ECT sensor 1 performance check
?1.
Start the engine, and let it idle for 10 minutes.

?2.
Check the parameter(s) below with the HDS.
Signal
Malfunction Threshold
Current conditions
Values
Unit
Values
Unit
ECT SENSOR 1
Less than 108
°F
    
Less than 42
°C

Do the current condition(s) match the malfunction threshold?

     
YES
     
     
     
     
NO
     
     
     
ECT sensor 1 is OK at this time. Go to step 6.
6.
ECT sensor 2 performance check:

ECT sensor 2 performance check
?1.
Let the engine idle for 10 minutes.

?2.
Check the parameter(s) below with the HDS.
Signal
Malfunction Threshold
Current conditions
Values
Unit
Values
Unit
ECT SENSOR 2
Less than 108
°F
    
Less than 42
°C

Do the current condition(s) match the malfunction threshold?

     
YES
     
     
     
     
NO
     
     
     
Go to step 7.
7.
Problem verification:

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

?2.
Allow the sensors and the engine to cool to the ambient temperature.

?3.
Note the ambient temperature.

?4.
Press the engine start/stop button to select the ON mode.

?5.
Quickly note the value of the ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
Signal
Current conditions
Values
Unit
ECT SENSOR 1
    
ECT SENSOR 2
    

?6.
Compare the value of ECT sensor 1 and the value of ECT SENSOR 2 with the ambient temperature individually.

Does either sensor differ more than 5.4 °F (3 °C) from the ambient temperature?

     
YES
     
     
     
Replace the sensor that differed more than 5.4 °F (3 °C) from the ambient temperature, then do the repair verification.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.?
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
P1116 ECT Sensor 1 Circuit Range/Performance Problem
      


Is DTC P1116 indicated?

     
YES
     
     
     
Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, 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.?