A4 Quattro Cabriolet V6-3.0L (BGN) (2005)
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Disconnect connector (arrow) to mass air flow (MAF) sensor.
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Connect multimeter as follows to measure voltage.
Connector
Measure to
terminal
2
Engine ground
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Operate starter briefly.
Specified value: approx. battery voltage
If specified value is not obtained:
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Check wiring from terminal 2 on connector via fuse to fuel pump relay for open circuit or short to Ground:
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Repair any open/short circuit as necessary.
If specified value is obtained:
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Connect multimeter between terminals 2 and 3 to measure voltage.
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Operate starter briefly (engine may start).
Specified value: approx. battery voltage
NOTE: Engine control module Ground is present at terminal 3 of the connector.
If specified value is not obtained: