A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
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Disconnect connector (arrow) at camshaft adjuster.
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Connect multimeter and measure resistance at valve.
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Specification: 10...18 ohms
If reading does not match specification:
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Replace valve.
If measured value matches specification:
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Check power supply.
Checking power supply
Requirements
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Fuse for camshaft adjustment valve OK
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Fuel pump relay OK
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Disconnect connector (arrow) at camshaft adjuster.
