Jetta L4-1.8L Turbo (AWD) (2000)
If the specification is obtained but there is a malfunction regarding the Mass Air Flow (MAF) sensor registered in the Diagnostic Trouble Code (DTC)
memory:
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Check the voltage supply for the Mass Air Flow (MAF) sensor.
If the specification is not obtained:
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Check the signal and Ground wires for the Mass Air Flow (MAF) sensor.
If the specification is obtained:
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Press the -> key.
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Press keys 0 and 6 for the "End output" function and confirm input with the Q key.
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Switch off ignition.
Checking Voltage Supply For Mass Air Flow (MAF) Sensor
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Pull 5 pin connector -1- off Mass Air Flow (MAF) sensor -2-.
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Connect multimeter to measure voltage on connector contact 2 and engine Ground.
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Start engine and run at idling speed.
Specification: 11 - 15 V
If no voltage is present:
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Switch off ignition.
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Check wiring from contact 2 to fuel pump relay (J17) according to wiring diagram.
If the voltage supply and wiring is OK:
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Switch ignition on.
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Connect multimeter to measure voltage on connector contact 4 and engine Ground:
Specification: 4.5 - 5.5 V
If no voltage is present:
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Switch off ignition.
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Check the signal and Ground wires.
Testing signal and Ground wires for Mass Air Flow (MAF) sensor