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That definition means that for some reason the PCM is seeing a low input from the ECT sensor. That could be sensor problem, a wiring problem, or a PCM problem, but the most likely problem is that the truck is actually running too cold. That could be a stuck open thermostat, or an incorrect temperature thermostat installed.

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โˆ™ 2006-06-08 12:36:59
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Q: How do you fix a coolant temperature circuit low input problem on a 1999 ford Explorer?
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