Jetta Sedan V6-2.8L (BDF) (2003)
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Spray the sensor (arrow) with commercially available chilling spray and watch 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 Mass Air Flow (MAF) Sensor -G70-:
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Vehicles with engine code AFP, item 4 ,
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Vehicles with engine code BDF, item 6 .
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
See: Powertrain Management/Computers and Control Systems/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: Powertrain Management/Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Continuation of test if indication is approx. -40 degree C:
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Disconnect 5-pin connector from Mass Air Flow (MAF) Sensor -G70- with Intake Air Temperature (IAT) Sensor -G42- (arrow).
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Bridge terminals 1 + 3 of connector using the respective adapter cables while observing the indication on display.
If indication jumps to approx. 140 degree C:
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End diagnosis and switch ignition off.
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Replace Mass Air Flow (MAF) Sensor -G70-:
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Vehicles with engine code AFP, item 4,
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Vehicles with engine code BDF, item 6.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.