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  #1  
Old 03-04-2018, 10:08 PM
Andyz4 Andyz4 is offline
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Mein Auto: 2006 Z4 3.0si
New electric water pump not running

Hi, I recently had an overheat condition on my 06 si (N52). I tested and found that the electric water pump was not running, nor would it run for self bleed program. Before suspecting bad pump I tested power supply to pump (Power, signal and ground) all tested good, so replaced pump with new proper Pierberg unit. Good news: Super easy pump access on Z compared with other series. Bad news: New pump also would not initiate during self bleed. What the?? I have read everything I can find on the subject but no solution yet. Starting to suspect new pump is also defective, unless someone has a suggestion? Otherwise I may have to let the stealership sort it. Thanks in advance.
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  #2  
Old 03-05-2018, 06:10 AM
wifesauto wifesauto is offline
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can you bench test the pump .....put 12 volt to it ?
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Old 03-05-2018, 08:54 AM
Andyz4 Andyz4 is offline
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Thanks for reply. I would like to bench test pump, but it might be difficult as in addition to +12 volts and ground supply, pump requires signal voltage at one of its 4 terminals in order to run pump. I seem to have that signal voltage (7.5 v) at plug, but nothing doing.
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Old 03-05-2018, 01:12 PM
wifesauto wifesauto is offline
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in your first post you said all the wires tested good.....it maybe time to have a mechanic look at it
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Old 03-05-2018, 03:47 PM
Newparts.com Newparts.com is offline
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I know you said that you checked the powers to the pump, but just to clarify:
12v At all times, Red wire
12v Key on, Orange wire
7-11v BSD Violet wire
Ground Brown wire

I've seen issues with the ground stud on the engine showing ground, but having enough resistance not to allow the pump to run under load.
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  #6  
Old 03-05-2018, 09:20 PM
Andyz4 Andyz4 is offline
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Mein Auto: 2006 Z4 3.0si
Thanks, yes readings are confirmed. I may try a backup ground lead hooked directly to battery (-) before condemning the pump motor. But as dealer is only 1 mile away that may be my best bet at this point, at least for diagnostics. I will report back with findings.
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