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Old 01-29-2013, 09:38 PM   #1 (permalink)
raylit20
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Join Date: Dec 2009
Location: Green Bay
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Avalon - '99 Toyota Avalon XLS
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OEM electric water pump control strategy?

Hi guys, I've been doing some digging on factory EWP's and I haven't found much information regarding the control strategy for these units. From what I gather so far, automakers are using PWM to vary pump speed.

Are these pumps activated only when a certain temperature threshold is reached, or do they run constantly only varying coolant flow? What kind of flow numbers are these factory electric pumps producing?

I recall reading a BMW press release for the 330i and it sounded as though the pump was off until the engine warmed up. Though this begs the question as to whether localized hot pockets could damage the engine.

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Last edited by raylit20; 01-30-2013 at 06:27 PM..
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