Passat Syncro Wagon V6-2.8L (ATQ) (2000)
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Remove Intake Air Temperature (IAT) Sensor -G42-. Plug connector back in.
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Remember the intake air temperature value.
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Spray the sensor with commercially available chilling spray while observing the temperature value. The temperature should decrease.
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End diagnosis and switch ignition off.
If the intake air temperature does not drop:
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Replace Intake Air Temperature (IAT) Sensor -G42-, item 10.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
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Generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Continuation of test if indication is approx. -40 degrees C:
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Disconnect connector -1- from Intake Air Temperature (IAT) Sensor -G42- (-2-).
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Bridge terminals 1 + 2 of connector using the respective adapter cables while observing the indication on display.
If indication jumps to approx. 143 degrees C:
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End diagnosis and switch ignition off.
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Replace Intake Air Temperature (IAT) Sensor -G42-, item 10.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
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Generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If indication remains at approx. -40 degrees C:
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End diagnosis and switch ignition off.
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Check wires according to wiring diagram.