A4 Quattro Wagon L4-2.0L Turbo (CAEB) (2009)
If the specified values were Not obtained:
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Replace the Ambient Air Temperature Sensor (G17 ).
If the specified values are obtained, continue the test according to the following table:
Checking wiring
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Turn the key on.
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Connect a multimeter to terminals 1 and 2 of the Ambient Air Temperature Sensor (G17) electrical harness connector.
Specified value: near 5.02 V
If the specified value was Not obtained:
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Turn the key off.
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Remove the Instrument Cluster. Refer to the appropriate service manual.
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Disconnect the Instrument Cluster harness.
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Using a multimeter, check the Ambient Air Temperature Sensor (G17) electrical harness connector terminals 1 and 2 to the Instrument Cluster
electrical harness connector T36 for an open circuit or a short, refer to the appropriate wiring diagram.
Specified value: 1.5 ohms max.
If the specified value was obtained:
Replace the Instrument Cluster.
If the specified value was Not obtained:
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Check the wiring for an open, high resistance or short circuit to Battery (+) or ground.
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.