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TT RS 2012 ➤
Generic Scan Tool - Edition 07.2011
3.5.25
Ambient Air Temperature Sensor,
Checking
Special tools and workshop equipment required
♦ Multimeter.
♦ Wiring diagram.
Test procedure
– Perform a preliminary check to verify the customers complaint.
Refer to ⇒ “3.1 Preliminary Check”, page 8
Start diagnosis
– Connect the scan tool.
– Engine MUST be at room temperature.
– Turn the ignition switch On.
– Using the scan tool, check the ambient air temperature:
Diagnostic text
Ambient Air Temperature (AAT)
Sensor
Specified value
approx. ambient air tem‐
perature
– Turn the ignition switch OFF.
If the specified value was obtained:
– Fault may be intermittent. Check for proper connection, dam‐
aged wiring or loose terminals.
Note
On some models the display in the cluster will default to 419° F if
the circuit is open or shorted to ground. The display on the cluster
may show 3 dashes on other models when signal is out of range.
If the specified value was Not obtained:
Checking internal resistance
– Disconnect the Ambient Air Temperature Sensor -G17- elec‐
trical harness connector.
– Using a multimeter, check the Ambient Air Temperature Sen‐
sor -G17- terminals 1 to 2 for resistance.
Use the chart below for the specified values:
Specified values:
AAT Temperature vs Resistance
Temp (C)
min. value ohms
max. value ohms
- 40
31811
37560
- 35
22941
26863
- 25
12415
14289
- 15
6958
7880
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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
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