| DTC Strategy |
Case1 |
- Monitors the difference between the startup coolant and IAT values
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- Faulty IATS
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| Case2 |
- Monitors the difference between the startup IAT and coolant values
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| Case3 |
- Start Test: Monitors the difference between max and min IAT in order to detect movement in IAT for a certain time.
- 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.
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| Enable Conditions |
Case1 |
- Engine soaked time ≥ 360 min
- Engine running state
- No faults present
- IAT stored previous trip
- Startup Coolant Temperature > -20°C
- Airflow > 15 g/s
- Vehicle speed > 40 kph
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| Case2 |
- Engine soaked time ≥ 360 min
- Engine running state
- No faults present
- IAT stored previous trip
- Airflow > 15 g/s
- Vehicle speed > 40 kph
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| Case3 |
- Engine soaked time > 360 min
- Engine Running State
- No fault present
- IAT stored previous trip
- No IAT Tests pending
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| Threshold value |
Case1 |
- Startup Coolant - Startup IAT ≥ 22°C
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| Case2 |
- Startup IAT - Startup Coolant ≥ 17°C
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| Case3 |
- Max IAT - Min IAT ≤ 3°C(5.4 °F)
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| Diagnosis Time |
Case1, 2 |
- Continuous (More than 1.25 second failure)
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| Case3 |
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| MIL On Condition |
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