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BMW 3-Series (E90 E92) Forum
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New water pump won't turn on
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04-24-2024, 08:05 AM | #23 | |
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Also when i tested X6035 all were “1” besides pin 4 it was “0” should i try tracing the wire for pin 4 to see if all is well and nothing is interfering with the wire? |
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04-24-2024, 09:13 AM | #24 | |
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1) at the F03 Socket, with X60571 connected & X6035 DIS-connected, & meter read "1", or Open Circuit (NO Short). 2) You then CONNECTED X6035 connector to Pump, & meter read "0" Ohms, measuring at F03 Socket as before, indicating "Continuity"/ a SHORT-to-Ground. If that understanding is CORRECT, there IS a short, but it MAY be due to movement of the wire when attaching the connector, rather than in the Pump. A) Since you now know HOW to test for "Short", try to devise a way to TEST the wire at the Connector (X6035/3, Red wire) with X6035 DIS-connected from Pump, by Manipulating/Jiggling the wire as you measure for "Continuity to Ground" (Fuse F03 REMOVED). Remember that AS LONG AS POWER DISCONNECTED from wire (F03 removed), it is SAFE to test that wire. B) You can ALSO measure Ohms at the Pump Pin that the Red wire of Connector X6035/3 connects to (with X6035 DIS-connected). Measure Ohms with Red Meter Probe on that Pump Pin, & Black Meter Probe on good Chassis Ground. Repeat Test with Black Probe on Pump Pin #4, which is OTHER large pump pin. Record/Report your Ohms Readings, along with the Ohms Range (e.g. 2k Ohms) selected on your meter. Make sure the "dot" or "decimal point" position is reported correctly. ANYONE done this test? Got a known-good Pump lying around that you can test? Test Ohms Resistance between TWO LARGE pump pins. C) There MAY be a Fault in the X6035 connector itself where there is "Intermittent Continuity" between sockets #3 (Red wire) & #4 (Brown Chassis Ground wire). Test with one meter probe on socket #3 & other on socket #4, as you manipulate the wiring & connector. Hang in there -- YOU can FIND the short location & SAVE $$$$ if you think about it. George |
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04-24-2024, 09:30 AM | #25 | |
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When testing Ohms/resistance in relation to Chassis Ground at the four sockets of X6035, there SHOULD be "Continuity to Chassis Ground" ("0") at X6035/4 (Large Socket #4, Brown wire), as THAT Brown wire connects to the Chassis to supply Chassis Ground to the Pump. See the 3rd ISTA ScreenPrint attached to Post #15 above. CONCEPT: ALL Brown Ground wires connect to Chassis, which is connected to Battery (-) Terminal/ Post. That completes the "CIRCUIT" by returning electron flow to battery: https://www.google.com/search?q=elec...hrome&ie=UTF-8 Please review the suggested tests in my post #24, and let me know if anything is UNclear. George |
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04-24-2024, 11:39 AM | #26 | ||
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As gbalthrop mentioned in post 24, you can wiggle the wires and see if the continuity changes. Sounds like you have disconnected and connected the wires enough times too. I would also suggest you test the connector >on the pump<, which I have not read so far. Test where Pin 3 of X6035 (red wire) goes on the pump and chassis ground. See what resistance value you see there. You may need to dial the multimeter to 200-ohms range (I do not know what the Pin 3-4 resistance of the pump is). My guess still is a bad pump, but you need to verify. You should consider buying from FCP Euro with their lifetime replacement warranty. I mostly use Rock Auto or RM European, just standard warranty but that is fine with me. I just hope no damage was done to the engine with the overheating. Last edited by mainbearing; 04-24-2024 at 12:00 PM.. |
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04-24-2024, 12:08 PM | #27 | |
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04-24-2024, 12:53 PM | #28 |
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348A stuck open thermostat will give you the no-heat condition even if the pump is working. Either there is a control fault or sounds like you have some questionable parts in there.
I only replaced the unreliable factory pump and thermostat once, but using aftermarket Behr and Pierburg pump. It was a pain for me for sure. I get you do not want to replace them again, but it may become necessary. At least do the test first. I could not remember if I got these off Rock Auto or RM Euro, but so far so good. I think BMW's big mistake was using electric pumps, which later they reverted back to mechanical. Just stupid. If needed, use CRC Electric Cleaner on the connectors, make sure to fully air dry before you plug things back up. CRC cleaner: https://www.crcindustries.com/qd-174...aner-11-wt-oz/ |
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04-24-2024, 02:15 PM | #29 | |
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