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P009A – Intake Air Temperature /Ambient Air Temperature Correlation

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P009A – Intake Air Temperature /Ambient Air Temperature Correlation
Description:                 The DTC indicates that the intake air temperature (IAT) and ambient air temperature (AAT) sensor readings differ by more than a calibrated value.
Possible Causes:       
 
Biased IAT or AAT sensor
Damaged IAT or AAT sensor
Diagnostic Aids:          Make sure the IAT, AAT and engine coolant temperature (ECT) sensor readings are within 18
°C (32.4°F) of each other after 6 to 8 hours at a stabilized ambient temperature.
Related Topics  P012D - Turbocharger/Supercharger Inlet Pressure Sensor Circuit High
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