Tiguan 4Motion (5N1) L4-2.0L Turbo (CCTA) (2009)
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Check the value indicated on the scan tool display.
If indication jumps to approx. - 40 °C or - 46 °C:
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Switch ignition off.
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Replace the IAT sensor (G42). Refer to the Repair Information.
If the indication remains at approx. 140 °C:
Checking wiring
If the manufacturers test box is being used, perform the following step.
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Install the test box.
If the manufacturers test box is not being used, perform the following step.
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Remove the Motronic Engine Control Module (ECM) ( J623).
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Disconnect the ECM harness.
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Using a multimeter, check the IAT sensor (G42 ) electrical harness connector terminal 1 to engine ground.
Specified value: OL or no continuity.
If the specified value was Not obtained:
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Check the wiring for a short circuit to Ground (GND).
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If necessary, repair the faulty wiring connection.
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
If the specified value was obtained:
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Check the IAT signal circuit from terminal 1 of the IAT to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T60
terminal 42 of the ECM harness for resistance.
If no malfunction is found in wiring:
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Replace the Motronic Engine Control Module (ECM) (J623).
Final procedures
After the repair work, the following work steps must be performed in the following sequence: