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What is the output of pin #3 when the car is cranking? I don't think 11v at pin #9 is an issue, the battery may just be a little low. Pin #3 is actual power supply for the pump and the module is not working it tends to not drive pin #3.
You should get a priming pulse to #3 when you first turn the key on, then it should be hot while cranking and running.
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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