New Beetle L4-2.0L (AZG) (2003)
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Connect multimeter to measure voltage on connector terminal 4 and engine Ground.
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Switch ignition on.
Specification: 4.5 to 5.5 V
If no voltage is present:
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Switch ignition off.
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Check signal and Ground wires.
Testing signal and Ground wires for Mass Air Flow (MAF) sensor
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Remove inner plenum chamber cover, left:
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Connect test box V.A.G 1598/31 to control module wiring harness. Engine control module is not connected by this action.