PCM monitors temperature difference between MAX. and MIN. IATS values to detect change in the IATS. Not only at "Start Test" but "Drive Test" while enable conditions are met. If PCM detects intake air temperature changes less than 5.4°F (-14.8°C). It determines that a fault exists and a DTC is stored. PCM monitors temperature changes resulting from cold soaking the vehicle. Therefore, Coolant temperature and Intake temperature should be changed. If PCM detects intake air temperature correlated to coolant temperature does not change. PCM determines that a fault exists and a DTC P0111 is stored.
Item | Detecting Condition | Possible cause | |
DTC Strategy | Case 1 |
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Monitors the difference between the startup coolant and IAT values | 1. Faulty IATS |
Case 2 |
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Monitors the difference between the startup IAT and coolant values | ||
Case 3 |
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Start Test: Monitors the difference between max and min IAT in order to detect movement in IAT for a certain time.
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Drive test: Performs the max and min delta check while driving under load for a length of time followed by an idle for a certain time. | ||
Enable Conditions | Case 1 |
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Engine cold soaked time longer than 360min
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Engine running state
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No faults present
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IAT stored previous trip
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Startup Coolant Temperature greater than -20°C (-4°F)
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Airflow greater than 15 g/s
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Vehicle speed faster than 40 kph (24.85 mph) | |
Case 2 |
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Engine cold soaked time longer than 360min
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Engine running state
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No faults present
•
IAT stored previous trip
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Airflow greater than 15 g/s
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Vehicle speed faster than 40 kph (24.85 mph) | ||
Case 3 |
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Engine soaked time longer than 360min
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Engine Running State
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No fault present
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IAT stored previous trip
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No IAT Tests pending | ||
Threshold value | Case 1 |
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Startup Coolant - Startup IAT greater than 22°C (71.6°F) | |
Case 2 |
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Startup IAT - Startup Coolant greater than 17°C (62.6°F) | ||
Case 3 |
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Max IAT - Min IAT less than 3℃(5.4 °F) | ||
Diagnosis Time | Case 1,2 |
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Continuous (More than 1.25 second failure) | |
Case 3 |
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Continuous (10 min.) | ||
MIL On Condition |
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NO MIL ON(DTC only) | ||
