This DTC sets when the IAT value is higher than a calibrated value indicating that the rationality test has failed and could prevent one or more on board diagnostic (OBD) monitors from completing.
The PCM runs this logic after an engine OFF and a calibrated soak period (typically 6 - 8hours). This soak period allows IAT and other temperature sensors to stabilize and not differ by greater than a calibrated value. DTC P0111 sets when the IAT at engine start exceeds the other temperature sensors by greater than a calibrated value.
Item | Detecting Condition | Possible Cause | |
Case 1 | DTC Strategy |
•
Rationality check | 1. Poor connection 2. IATS |
Enable Conditions |
•
Elapsed time after start is lower than 40 sec. | ||
Threshold Value |
•
The temperature difference between IAT and ECTS is lower than 20.3 °C | ||
Diagnostic Time |
•
2 sec | ||
MIL ON Condition |
•
2 Driving cycles | ||
Case 2 | DTC Strategy |
•
Rationality check | |
Enable Conditions |
•
Number of driving conditions for at least 15 sec at a speed less than 4.8km/h is greater than 4 times.
•
Number of driving conditions for at least 8 sec at speed higher than 48km/h is greater than twice. | ||
Threshold Value |
•
The maximum temperature and minimum temperature difference value is lower than 1.5 °C | ||
Diagnostic Time |
•
2 sec | ||
MIL ON Condition |
•
2 Driving cycles | ||
