Jetta Sedan L4-1.9L DSL Turbo (BEW) (2005)
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Remove Intake Air Temperature (IAT) Sensor -G42-.
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Re-connect harness connector at Intake Air Temperature (IAT) Sensor -G42-.
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Remember intake air temperature value.
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Spray sensor with commercially available chilling spray while observing temperature value. The temperature must decrease.
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End diagnosis and switch ignition off.
If intake air temperature does not drop:
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Replace Intake Air Temperature (IAT) Sensor -G42-.
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Erase DTC memory of control module for Diesel-Direct fuel injection system, Diagnostic mode 4: Reset/erase diagnostic data. See: Testing and
Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 4: Reset/Erase Diagnostic Data
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Generate readiness code. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Checking resistance at sensor
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Measure resistance at Intake Air Temperature (IAT) Sensor -G42- terminals 1 + 2.
Range A displays resistance values for the temperature range of 0 to 50 degrees C, range B displays resistance values for the temperature range of 50 to
100 degrees C.
Read-out examples:
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30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 k Ohms
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80 degrees C is in range B and corresponds to a resistance of 275 to 375 Ohms