GTI L4-2.0L Turbo (BPY) (2007)
Intake Air Temperature Sensor: Testing and Inspection
Intake Air Temperature (IAT) Sensor G42, Checking
NOTE: Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Intake Air Temperature (IAT) Sensor G42.
Special tools, testers and auxiliary items required
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Multimeter.
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Wiring diagram.
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Cool spray (commercially available).
Test requirements
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The Motronic Engine Control Module (ECM) J623 fuses OK.
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Battery voltage at least 12.5 volts.
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All electrical consumers such as, lights and rear window defroster, switched off.
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Vehicles with automatic transmission, shift selector lever into position "P" or "N".
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A/C switched off.
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Ground (GND) connections between engine/transmission/chassis OK.
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Ignition switched off.
Function test
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Connect the scan tool.
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Switch the ignition on.
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Using the scan tool, check the intake air temperature:
Diagnostic text
Specified value
Intake Air Temperature (IAT)approx. ambient air temperature
If the specified value is not obtained:
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Continue the test according to the following table:
If the specified values are obtained:
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Remove the Intake Air Temperature (IAT) Sensor G42.
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Spray the Intake Air Temperature (IAT) Sensor G42 with a commercially available cool spray while observing the temperature value on the scan
tool.
The temperature value must decrease.
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End diagnosis and switch the ignition off.
If the intake air temperature does not decrease:
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Replace the Intake Air Temperature (IAT) Sensor G42.
If the intake air temperature does decrease:
Checking internal resistance