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BMW 3-Series (E90 E92) Forum
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Water pump not working
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10-11-2024, 03:26 PM | #1 |
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Water pump not working
Hello everyone,
So i replaced my waterpump and thermostat on an 09 e92 335i with the n54 after getting a waterpump code and overheating on the highway which caused me to push it back home. I am still getting the waterpump code, the car overheats, and when I tried to start the coolant bleeding process nothing happened, I checked all 3 fuses( 2 in the fuse box and one near the ecu) and they all came up good. I did noticed some coolant in the connection of the waterpump so i dried it up and plugged it back together properly. My suspicions are the voltage regulator or the fuse box ontop of the battery, I am also considering the IBS has gone bad because I am getting a code but the car starts. When the car starts it takes a few seconds to crank over and then the electronics inside the cabin take like 30 seconds to come on and I feel like these issues are caused by the same problem. My question is what should I look at/ replace first? Thank you. |
10-11-2024, 03:48 PM | #2 |
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Battery?
Such as, how new is the battery? Is it the correct battery? Since you're able to read codes it seems, if you post all of the actual codes you're getting that might help others diagnose this. |
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StradaRedlands6233.00 |
10-11-2024, 09:29 PM | #4 | |
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Drives: 330i, 135i
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Quote:
You should be able to hear the water pump working when bleeding the system. |
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StradaRedlands6233.00 |
10-11-2024, 09:47 PM | #5 |
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I bought an aluminum one from FCP Euro, paid 500, but unfortunately i don't hear it or see the coolant level move at all, the temp keeps rising until it just overheats and goes into limp mode.
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10-12-2024, 11:21 AM | #7 | |
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Your codes suggest an issue with the BSD Interface. The DME provides a "Speed Signal" to the Coolant Pump via the BSD Bus. That is the small Violet wire found at X6035/2, or socket #2 of the Pump Connector, X6035. ISTA ScreenPrints of Pump, BSD & CAS wiring are attached to NEXT Post. Although there MAY be other issues, I would FIRST use a Multimeter to test Voltage at X6035 (disconnect connector X6035), then turn Ignition ON: 1) There should be 12V+ at Orange wire, X6035/1; 2) There should be 12V+ at Red wire, X6035/3; 3) Test for voltage at Violet wire, X6035/2; NOT sure what that should be, but > 0V; please report those voltages; 4) Test for Continuity to Chassis Ground at Brown wire, X6035/4. 5) Turn OFF Ignition & Disconnect 2-pin connector that goes from IBS to chassis harness, at RR fender, outboard & above battery. 6) Turn Ignition back ON & Repeat test (3) measurement of voltage at Violet wire, reporting any difference. I'm NOT familiar with MHD. If it, or any other Tool you have will activate Pump, measure voltage at violet wire AGAIN with pump activated, or in "Bleed" mode. As you probably know, even though you have 12V+ at X6035/1 & /3, & Chassis Ground at X6035/4, it takes a voltage supply via the Violet wire (Speed Signal) to make the pump run. We are testing for CHANGE of voltage in that Violet wire. If you have a more advanced Meter that can read Duty Cycle or Frequency in that wire, that is BETTER than simply reading Voltage. ANYONE who has tested either Voltage or Duty Cycle on Violet "Speed Signal" wire? Please report your findings. Please let us know what you find, George |
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StradaRedlands6233.00 N4Nick4.50 |
10-12-2024, 11:24 AM | #8 |
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Attached are ISTA ScreenPrints showing various Pump, BSD, CAS circuits related to prior post.
George |
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StradaRedlands6233.00 N4Nick4.50 |
10-12-2024, 11:31 AM | #9 |
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Here are Links to BMW Fault Code Lookup, Fault Information sheets, with explanation & Service Notes for Codes 2CD3, 2E7C, & CDA0. Your situation is rather complicated, but if you test & inspect (for wiring issues) systematically, it may be something simple to fix.
https://bmwfault.codes/XMLDiagView?d...E2NDM2OTcwNQ== https://bmwfault.codes/XMLDiagView?d...E2NDU1MzIwNQ== https://bmwfault.codes/XMLDiagView?d...E2NTM2NDgwNQ== George |
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StradaRedlands6233.00 N4Nick4.50 |
Yesterday, 01:25 PM | #10 | |
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Thank you very much for the help, I will try my best to report these findings as soon as I find the time. |
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Yesterday, 07:08 PM | #11 | |
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Thank you for the help george, I will update the thread if anything happens. |
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StradaRedlands6233.00 GoRomeo1228.50 |
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