Jetta SportWagen L4-2.0L DSL Turbo (CBEA) (2009)
Air Flow Meter/Sensor: Testing and Inspection
Diagnostic Procedures
Mass Air Flow Sensor, Checking
Observe all safety precautions: --> [ Safety Precautions ]
View clean working conditions: --> [ Clean Working Conditions ]
Prior to repair work, perform a preliminary check to verify the condition. Refer to --> [ Preliminary Check ] See: Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check.
‹› Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) Sensor (G70).
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Mass Air Flow (MAF) Sensor (G70) fuse 1 in Fuse Panel C is OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground connections between engine/transmission/chassis OK.
‹› Coolant Temperature at least 55° C.
‹› Ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to --> [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/Preliminary Check
Start diagnosis
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Connect the scan tool.
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Start engine and let it run at idle.
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Using the scan tool, Check the air flow quantity of the Mass Air Flow (MAF) Sensor (G70) at idle:
If the specified value was obtained: Condition is not present at this time.
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Check the electrical harness connector at the ECM and sensor for damage, corrosion, loose or broken terminals.
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Check the intake duct for air leaks, loose connections.