A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
Intake Air Temperature Sensor: Testing and Inspection
Ambient Air Temperature Sensor, Checking
Ambient Air Temperature Sensor, Checking
Special tools, testers and auxiliary items required
‹› multimeter.
‹› Wiring diagram.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/Preliminary Check
Start diagnosis
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Connect the scan tool.
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Engine MUST be at room temperature.
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Switch the ignition on.
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Using the scan tool, check the ambient air temperature:
If the specified value was obtained:
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Fault may be intermittent. Check for proper connection, damaged wiring or loose terminals.
‹› The reading will default to 419 °F if the circuit is open or shorted to ground.
If the specified value was Not obtained:
Checking internal resistance
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Turn the key off.
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Disconnect the Ambient Air Temperature Sensor ( G17) electrical harness connector.
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Using a multimeter, check the Ambient Air Temperature Sensor (G17) terminals 1 to 2 for resistance.
Use the chart below for the specified values:
Specified values: