Jetta Sedan V6-2.8L (BDF) (2003)
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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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Connect multimeter to terminal 2 of connector and engine Ground (GND) for voltage measurement.
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Start engine, and let run at idle.
Specified value: 11.0 to 15.0 V
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Switch ignition off.
If there is no voltage:
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Check wire between 5-pin connector terminal 2 and the Fuel Pump (FP) Relay -J17- for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
If voltage supply and wires are OK:
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Connect multimeter to terminal 4 of connector and engine Ground (GND) for voltage measurement.
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Switch ignition on.
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Specified value: at least 4.5 V
Switch ignition off.
If there is no voltage:
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Check signal and Ground (GND) wire of Mass Air Flow (MAF) sensor.
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.
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool
Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring Test