S4 V8-4.2L (BHF) (2004)
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Intake Air Temperature Sensor: Testing and Inspection
Intake Air Temperature (IAT) Sensor -G42-, Checking
Recommended special tools and equipment
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V.A.G 1526A multimeter
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V.A.G 1594A connector test kit
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V.A.G 1598/31 test box
NOTE: Intake Air Temperature (IAT) Sensor -G42- is integrated in Mass Air Flow (MAF) Sensor -G70-.
Test requirements:
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Fuses for engine electronics OK
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Ignition switched off.
Checking function
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Connect diagnostic tester. See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/Diagnostic Tester,
Connecting
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Start engine and let run at idle.
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In diagnostic function "33 - OBD", select "Mode 1: Checking measured values."
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Select the desired measuring value "PID 15: Intake air temperature".
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Specified value: approx. ambient temperature
NOTE: If a temperature is indicated which differs greatly from ambient temperature of sensor, check sensor and sensor wires for contact
resistances and open circuit.
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End diagnosis and switch ignition off.
If indications do not resemble description:
Checking wire connections