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 ECM/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 | |
DTC Strategy |
•
Plausibility check | 1. Poor connection 2. IATS | |
Enable Conditions | Case1 |
•
Engine speed during engine start (engine operating state out of start) > 640...960rpm
•
6V < Battery voltage < 16V
•
Engine Coolant Temperature(ECT) > 74°C
•
abs(ECT at engine start - ECT at Engine stop at previous DC) > 5.25°C
•
Cumulative time for IAT signal increase check [low load driving condition: mass air flow<5.5 g/sec(20kg/h) & vehicle speed<12.4 mph] > 200sec
•
Cumulative time for IAT signal decrease check [high load driving condition: mass air flow>11.1 g/sec(40kg/h) & vehicle speed>24.8 mph] > 160sec | |
Case2 |
•
6V < Battery voltage < 16V | ||
Threshold Value | Case1 |
•
Intake air temperature signal < 1.5…20°C versus IAT at start - Low IAT at start : failure if IAT variation < 1.5 °C - Middle IAT at start : failure if IAT variation < 1.5 °C - High IAT at start : failure if IAT variation < 20 °C | |
Case2 |
•
Abs(IAT - IAT moving mean value) > 8.25°C | ||
Diagnostic Time | Case1 |
•
Immediate | |
Case2 |
•
1 sec | ||
MIL ON Condition |
•
2 Driving cycles | ||
