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BMW 3-Series (E90 E92) Forum
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BSD Coolant Pump, IBS Sensor missing
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02-28-2022, 06:55 PM | #1 |
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BSD Coolant Pump, IBS Sensor missing
08 N54 here with build date 02/08
I have these two codes and the car shows me the yellow and red coolant warnings after driving for 5-10mins. It does not initiate the bleed procedure with gas pedal method. The heating in the car also does not work. Only blows cold air I checked the 50A fuse in the dme box and it was good. I unplugged ibs, alternator, oil level sensor, one at a time and it still wouldn’t work and would show me these same codes. I then am now in the process of putting a new pump and thermostat. I plugged in the pump without connecting any hoses to see if the codes go away. It’s still there. I also tried to bleed the pump while it was out in the open just to see if it would even initiate and it still doesn’t. I’m lost !
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12' 335i xDrive
Pure Stage 2 11.4s@120mph (Full Weight + 50lb ea wheel on street) // E30 Wedge Performance |
02-28-2022, 10:44 PM | #2 |
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Power, ground and wire integrity testing. BSD is a communication circuit and does not cut power to the pump. I've used this article at Pelican Parts for water pump testing and troubleshooting. It's a 5 series but same engine (N54). Very helpful with pics and wiring diagrams.
https://www.pelicanparts.com/techart...mp_Testing.htm Last edited by dmckmc; 02-28-2022 at 10:52 PM.. |
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02-28-2022, 10:55 PM | #3 |
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Link to another thread with similar problem and solution:
https://www.e90post.com/forums/showthread.php?t=1738058 |
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03-01-2022, 09:57 AM | #4 | |
First Lieutenant
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Quote:
Also it goes without saying, don't drive, you don't have coolant circulating so it will boil and blow stuff up very fast. |
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11-04-2023, 05:06 PM | #5 |
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Hello,
I have bmw 335xi 2007 e92 n54 october build Pin 1 is at 11.7 pin 3 is at 11.7 (same as two orange wires, battery post, 40amp fuse in ebox) pin 2 is at 5.3 (same as purple wire on engine bay before going down to pump) pin 4 - ground is at 0 what should these readings be? The bleed process will not initialize |
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