Beetle L4-1781cc 1.8L Turbo (APH) (1999)
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Connect multimeter to measure voltage on connector contact 4 and engine Ground.
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Switch on ignition.
Specification: min. 4.5 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
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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. The engine control module is not connected by this action.
