If I were to make a semi-educated guess, I would think that the "check gauges" and other observations about the intrument cluster happen when the PCM gets put into programming mode. Our >2004 instument clusters get much of their info like speed and temps from the PCM via the CAN bus. So if the PCM is busy doing something critical like getting reprogrammed, it's possible that the usual information between the two stops and the instument cluster thinks it has lost its' "mommy" --the PCM, and the ICM "cries" the only way it knows how. It all gets better when the PCM comes back to life after programming and everybody (all the modules) start talking again.
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2007 F150 XL, 4.6, Regular Cab, Gryphon Installed 2/2009
"voiding warranties since 1979"
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Sun, March 22nd, 2009, 04:06 AM
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