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Home >> Freightliner >> 2004 >> Sprinter 3500 L5-2.7L DSL Turbo >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Air Temperature Sensor ( Ambient / Intake ) >> Description and Operation
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Air Temperature Sensor ( Ambient / Intake ): Description and Operation

DESCRIPTION
The intake air temperature sensor is located between the charge air pipe and the charge air distribution of the cylinders The intake air temperature sensor measures the temperature of the air as it is supplied to the cylinders and transmits the value to the ECM This is required in order to determine the density of the air being supplied for the combustion process The value range is from minus 40°F up to 302°F (minus 40°C to 150°C)

OPERATION

Inlet Air Temperature Sensor:




The Negative Temperature Coefficient (NTC) resister located within the intake air temperature sensor alters it's resistance in line with the charge air temperature. If the engine is cold, the value equals ambient temperature. For a temperature of 68�F (20�C) the resistance is approximately 6000 ohms. For a temperature of 104°F (40°C) the resistance is approximately 2600 ohms.
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