Passat L4-1.8L Turbo (AWM) (2004)
If voltage supply and wires are OK:
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Switch ignition on.
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Connect multimeter to terminal 4 of connector and engine Ground (GND) for voltage measurement:
Specified value: 4.5 to 5.5 V
If there is no voltage:
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Switch ignition off.
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Check signal and ground wires
Checking signal and Ground wires of Mass Air Flow (MAF) Sensor
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Connect test box to control module wiring harness, connect test box for wiring test. Engine Control Module ECM) is not connected. See:
Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/Test Box,
Connecting For Wiring Test
Vehicles with engine code AEB
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Check wires between test box and 4-pin connector for open circuit according to wiring diagram.
Terminal 4 + socket 13
Terminal 2 + socket 12
Wire resistance: max: 1.5 ohms
Vehicles with engine code ATW, AUG, AWM