Quote:
Originally Posted by MST Engineer
I work for Toyota and have access to the tech bulletins so I have been keeping my eye out for updates on this one. They just released an updated one a few weeks ago that found the root cause of the chirping. It has to do with bad seal alignment on the inside of the DI pump that causes the noise. To fix it you have to have the dealer replace the pump but it has to be after a certain manufacture date. I think the date was 4/2013 but I will have to check when I'm at work.
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Not to rain on the parade, but this information came out back in April, and people who have been getting the pumps replaced as early as last month are still getting the chirps after a little while.