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520D -2006 - Specific (Non) starting issue

785 views 2 replies 2 participants last post by  Captndaz 
#1 ·
Hi I have a 520D 2006 E60 that is not starting. I have replaced the starter and the battery is in good condition.

Symptoms:
When the Key fob is inserted, the ignition comes on as normal.
When the button is pressed the starter motor engages but then immediately disengages.

Key points.
* The ignition lights and displays do not go out.
* It is not just the solenoid that engages, the motor also engages for a fraction of a second.
* It will do the same thing repeatedly.
* It doesn't display any fault messages.
* The engine starts fine if I put power directly to the solenoid.

I'm don't know how the system works, but I assume there is a process that keeps the starter engaged until it starts, then disengages it. The symptoms suggest that system is disengaging the starter too soon. Maybe whatever sensor signals the engine has started has failed?

Can anyone help?

Many thanks

Darren
 
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