Passat Wagon L4-2.0L (ABA) (1995)
Checking Voltage Supply
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Separate 4-pin connector to MAF sensor.
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Connect multimeter to measure voltage at connector terminals 1 and 3.
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Switch ignition on.
Specification: Min. 9 volts
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Switch ignition off.
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Reconnect MAF sensor harness connector.
If no voltage is present:
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Check wiring according to wiring diagram.
Checking wiring
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Connect VAG 1598/18 test box to ECM wiring harness.