TT Coupe L4-1.8L Turbo (AWP) (2005)
Air Flow Meter/Sensor: Testing and Inspection
Mass Air Flow Sensor, Checking
Mass Air Flow Sensor, Checking
NOTE: Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) Sensor.
Recommended Special Tools, Workshop Equipment, Testers, Measuring Instruments and Auxiliary Items
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V.A.G 1526 portable multimeter or V.A.G 1715 multimeter
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Adapter set V.A.G 1594
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Wiring diagram
Test Conditions
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The corresponding fuses of Mass Air Flow (MAF) Sensor -G70- must be OK
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Fuel Pump (FP) Relay -J17- must be OK, check
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Battery voltage must be at least 11.5 V.
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All electrical consumers such as, for example, lights and rear window defroster must be switched off.
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The parking brake must be applied, otherwise the daytime running lights are switched on.
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If the vehicle is equipped with an air conditioning system, this must be switched off.
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The Ground (GND) connections between engine and body must be OK.
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Coolant temperature must be at least 80 degrees C: See: Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Mode 01 - Read
Current System Data Check measured values; PID 5, Coolant temperature.
Function Test
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Connect diagnostic tester. See: Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Tester, Connecting
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Start engine and let run at idle.
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Under address word 33, select "Diagnostic mode 1: Checking measuring values."
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Select the measuring value "PID 16: Airflow quantity at Mass Air Flow (MAF) sensor".
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Check specified value of air flow quantity at Mass Air Flow (MAF) Sensor at idle:
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End diagnosis and switch ignition off.
If specified value is attained, but DTC memory has a DTC concerning Mass Air Flow (MAF) Sensor:
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Check Mass Air Flow (MAF) sensor voltage supply.
If the specification is not obtained:
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Check Mass Air Flow (MAF) sensor signal and Ground (GND) wires.
Mass Air Flow Sensor Voltage Supply, Checking
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Disconnect Mass Air Flow (MAF) Sensor connector.
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Connect multimeter to terminal 2 of connector and engine Ground (GND) for voltage measurement.
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Briefly operate starter.
Specification: approx. battery voltage
If no voltage is present:
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Switch off ignition.