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Kirk,
Here is a picture of the connector on the pump speed sensor. This is viewed from the top of the pump down:
As mentioned, I just measured the resistance between the two terminals on the connector. There is no continuity below about 0 deg. Celsius. It makes me wonder if that's the same issue you're having, but it's odd that you only have the problem between 3 and 10 deg. C. Who knows how those sensors work, though.
If it is the sensor (i.e. you can confirm that it has no continuity at the temperatures you are having trouble) then you may well be able to just replace it without having to remove the pump. That is what I intend to do, as a good samaritan from Australia is sending me his old sensor. However, I'm also getting a quote from a local guy here for the cost of a new one. I'll let you know when I find out what that cost is.
If you do decide to remove and replace the pump, you may be able to save a lot of $$ by doing it yourself. I would order it from Australia - Castle Hill Toyota. I've been in touch with a gentleman there named James Sloane. If I recall correctly, it worked out to about $350 CDN with shipping at the time (a week or two ago).
Even if you can confirm that it's the pump speed sensor, you may want to order the pump, take out the new sensor and replace the faulty one with it since this will be a lot easier than removing and replacing the entire pump.
I'm located in the Okanagan in British Columbia- if you're nearby and want some help let me know. I can't say that I'm *that* mechanically inclined, but I have played around with the 2L-TE engine a fair bit due now to my own woes.
Cheers,
Max
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