R8 Quattro Coupe V10-5.2L (BUJ) (2010)
Ambient Temperature Sensor / Switch HVAC: Testing and Inspection
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: Powertrain Management/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: