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I believe that is a test cycle. When you turn on the key it sweeps the full cycle to test where the begingin and end of the sweep is. I dont know where they get the idea that it is due to a bad battery or alternator. My truck does it everytime and I have a brandnew optima battery and a 140 amp alt that is functioning perfectly. But i could be wrong. It has happened before.
It means your battery or alternator could be going out. On my 2003 f150 it did the full sweeping cycle for serveral weeks and then the battery went after five years. Put in new one and it stopped. So I believe that is the purpose of the full sweep.
steve
2010-02-10
at
8:20am
gauge sweep
i donr know where the bad battery/alternator info came from...i have a 2010 f150 with 300 miles on it and the gauges sweep everytime i start it
I have a 1999 F150...My gauges (tach, speedo) sweep when the battery or altenator are going weak. After I have changed either compnents the sweeping stopped.
the new model trucks all do it! i have a 2010 with 250 miles. it sweeps everytime u start it. many high end cars do it. lexus marcedez bmw. dont know what the pupose is for
paulsur
2010-05-15
at
11:22pm
guage sweep on brand new 2010 FX2
My brand new FX2 does this when I start to. No big deal.
connie
2010-05-19
at
6:31am
My friend and I both have a new 2010 F150 and both vehicles sweep to max on start up every time.
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2009-07-28 at 4:53pm
2010-01-12 at 10:46pm
2010-02-10 at 8:20am
gauge sweep
2010-03-07 at 11:26pm
Gauges sweeping
2010-05-04 at 5:20pm
gage sweep
2010-05-15 at 11:22pm
guage sweep on brand new 2010 FX2
2010-05-19 at 6:31am