![]() At any point in this procedure that you find an incorrect state or faulty component, repair the item, clear adaptations and recheck system for fault codes. Other BMW models are similar and the diagnosis can be used with slight variations. The procedure will take you through multiple checks, tests and visual inspections to determine what is causing the symptoms and fault codes on the BMW you are working on. You may be able to get at the connector for the pump (to test voltage, or test by supplying voltage with engine off and everything else silent) by removing the passenger side splash guard underneath the front bumper. If you have INPA or DIS you can also turn it on manually. In this technical article, we will give you the definitive guide on diagnosing BMW variable-valve timing (VANOS) faults. The pump should run for a few minutes when you first turn the car on.
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