PCM monitors the engine coolant temperature. If the engine coolant temperature's signal is temporarily stuck above the lowest enable temperature to enable other diagnostic or the coolant temperature exceeds the threshold temperature under normal operation loads or the difference between its current temperature and startup temperature is less than threshold value over predetermined period, the PCM sets a P0116 DTC.
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
Monitor the engine coolant temperature | 1. ECTS | |
Enable Conditions | Case1 |
•
Shutdown time longer than 180 minutes
•
Intake air-temperature at start-up less than 40℃(104℉)
•
No disabling faults(ECTS)
•
Engine running longer than 60 seconds
•
Minimum airflow is satisfied for a certain time | |
Case2 |
•
Coolant sensor is normal
•
No disabling faults present(DTCs related to MAFS/MAPS, catalyst, fuel system or engine oil temperature sensor)
•
Coolant Temperature at startup less than 45℃( 113 °F)
•
Engine running state
•
Coolant temperature greater than 50℃( 122 °F)
•
Intake air temperature less than 35℃( 95 °F) | ||
Case3 |
•
Engine running state
•
6 hour cold sock IG-OFF
•
No disabling faults(DTCs related to HO2S, MAFS/MAPS, catalyst, fuel system, ECTS, or misfire) | ||
Threshold value | Case1 |
•
When the start-up engine coolant temperature does not rise by 1.5 ℃(2.7℉). | |
Case2 |
•
Coolant temperature greater than 110℃ (230 °F) (Average airflow less than 50 g/sec and filtered airflow less than 40 g/sec) | ||
Case3 |
•
The difference between the current temperature and startup temperature less than 1.5 ℃(2.7℉) | ||
Diagnosis Time | Case1 |
•
Immediately | |
Case2 |
•
Once per driving cycle ( about 2 minutes) | ||
Case3 |
•
Once per driving cycle (More than 120 seconds failure) | ||
MIL On Condition |
•
NO MIL ON(DTC only) | ||
