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Re: 95 Dodge Ram 5.9L, why is there 5 volts on the 02 signal wire?
Posted to Technical Discussion Forum on 7/10/2002 1 Reply

Mark,

Richard is correct that the 5.0 Volts bias is used for the heater diagnostic. Make sure the heater is working. the PCM pulses the heater for a prescribed amount of time while watching the 5.0 volt bias and wants to see it pulled to a lower value to pas... Login to read more.

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