Jetta L4-2.0L (AEG) (2000)
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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-, item 3.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. See: 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: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Continuation of test if indication is approx. -40 or -46°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°C:
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End diagnosis and switch ignition off.
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Replace Mass Air Flow (MAF) Sensor -G70-, item 3.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. See: 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: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If indication remains at approx. -40 or -46°C:
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End diagnosis and switch ignition off.
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Check wires according to wiring diagram.