S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
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Check for open circuit in wiring between test box and 2 pin harness connector using wiring diagram.
Specified value: max. 1.5 Ohms
Terminal on 2-pin
Contact on control
harness connector
module connector
or test box
1
85
2
108
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Check wiring for short circuits to each other between contacts 1 and 2 on 2-pin connector. Also test for short circuits to B+ or Ground (GND).
If no malfunction in wire is detected:
Checking sender
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Measure resistance between contacts 1 (signal) and 2 (Ground GND)) on connector for Intake Air Temperature (IAT) sensor -G42.
Temperature °C
Resistance kOhms
-20
approx. 13.8
0
approx. 55
20
approx. 2.4
40
approx. 1.1
60
approx. 0.6
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If value does not match the specification, replace intake air temperature sensor.
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In order to install a new sensor, the intake manifold must first be removed.