Volvo All Engines (2017 Emissions) Fault Code: P009A00 PID: EMS Engine Air Intake Temperature – Correlation
Volvo All Engines (2017 Emissions) Fault Code: P009A00 PID: EMS Engine Air Intake Temperature – Correlation
Circuit description
The Intake Air Temperature and Humidity Sensor contains two thermistors, and the resistance of each thermistor varies inversely to temperature. By monitoring the current flow through each thermistor, the Engine Control Module (ECM) calculates the temperature and humidity of the air entering the turbocharger.
The Engine Control Module (ECM) uses values from the Intake Air Temperature (IAT), Intake Manifold Pressure (IMP) and compressor efficiency to calculate the Compressor Discharge Temperature.
Conditions for diagnostic trouble code (DTC)
The sensor signal is not rational
Probable cause
1) Intake Manifold Pressure/Temperature Sensor Internal fault
2) Shorted wiring harness
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