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  #1  
Old 02-08-2020, 06:02 PM
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IHKA/AUX WATER PUMP

Some months ago the aux water pump stopped working. Ignored it cos it was summer, have now fitted new one which puts coolant into header tank but at about 25% flow. Checked voltage at plug and itís 4.65v Put 12v to motor and it runs like a trooper. Question does the IHKA regulate the voltage or is it faulty. Never seen more than a trickle all the times Iíve looked. Have put a separate earth to the plug without any improvement. Thanks in advance.


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Old 02-08-2020, 06:23 PM
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Sounds strange. There should be direct battery voltage from IHKA to aux water pump when activated.
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Old 02-08-2020, 09:23 PM
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the low voltage is really a problem. it could be a relay or transistor driver that went bad. do you have access to the wiring diagrams ?
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Old 02-08-2020, 10:41 PM
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There are no relays. It must be a FET on IHKA board.

https://www.newtis.info/tisv2/a/en/e...r-pump/hDKLnGe
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Old 02-09-2020, 12:32 AM
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I thought I saw my foxwell had a test setting for 30% etc speed. I have a feeling you are seeing a PWM reduced speed on purpose.

If the heater cores stay warm at idle your aux pump is running fast enough.
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Old 02-09-2020, 09:01 AM
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Interesting, I thought that maybe because I didnít change it when it stopped working and the fact that there is no fuse to blow that I had burnt something out in the IHKA. The fact that there are no heater problems would support Andrews theory. Itís just that I always thought it was either full flow or nothing.


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Old 02-09-2020, 09:48 AM
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A quote from BMW IHKA document: "The auxiliary water pump is powered directly from the IHKA control module through a final stage output." So indeed it could be PWM controlled, not just on/off. Unfortunately there was nothing more specific on the matter.
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Old 02-09-2020, 10:11 AM
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Thanks for that information, when I first put it in even though there was no flow I knew it was running by feel, the right side had no heat but I had read on here to rev to between 3/4K revs a few times to perhaps shift an air lock, this restored the full heating and I then started to get the roughly 25% flow. Not had in issue since (6 weeks)


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Old 02-09-2020, 03:36 PM
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for some reason in my mind i was thinking the aux washer pump and not the aux coolant pump .
i would perform a resistance check of the harness. from the wire in the ihka harness to the signal wire from the connector to the pump. should be less than 1.0 ohm or very near. Anything more could indicate a problem with corrosion or internal break of the wires (think only one strand carrying current) which would really drop the voltage a whole lot.
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Old 02-09-2020, 07:11 PM
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Or check the voltage with an oscilloscope - that way you can spot the PWM signal (if it IS PWM).

Don't have a 'scope? Then try your digital multi-meter on the frequency (Hz) range. If you get nada, it's likely DC line but if the meter reads a frequency of something like 1000HZ (1kHz) then its a PWM circuit.
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