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International Automotive Technicians Network
Re: Dodge runs lean but say it rich
Posted to Technical Discussion Forum on 11/29/2021

If I am not mistaken, that PCM applies 5V to the sensor signal wire.

The 5V is through a very high value resistance, so when the sensor work, the sensor's low impedance (it is a voltage /current generator) overrides the 5V and you have normal voltage reading... Login to read more.