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Old 01-24-2011, 05:08 PM   #9
Pierre
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Join Date: May 2009
Location: Camarillo, CA
Posts: 79
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Default Relay or pump? voltage

During cranking, you will most likely get lower voltage to the pump because the starter is sucking up all the juice from your battery. A bad relay will give you no voltage.
You can also jump the relay terminals to test the pump as described above. Take the relay out (I found out it's the left relay on the 2-relay setup, the right one os the DME relay, both green) and with the ignition on, use a jumper wire between terminal 30 and 87. (6 and 9 clock positions if you're standing next to the fuse box) You should be able to hear the pump turn on and buzz. You will also get 12V to the pump terminals. If you have the voltage and no buzzing, the pump is bad and needs to be replaced.
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Pierre
96 318ti (S52), 97 318ti, 95 318ti, 69 2002 (M20), 74 2002tii, 76 530i (3.3), 79 323i, 81 528i, 90 325i, 91 318is, 97 Z3, 2002 330i, 2002 R1150RT.
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