Mopar heated O2 sensor question

[Rich M]

The 4-wire heated sensors I have dealt with (mainly Bosch), incorporate a
positive temperature coefficient function in the heater, so as the sensor
heats up the resistance increases, reducing the current drawn from 12V
supply, while maintaining temperature. You can check this easily; apply 12V
power to the heater and measure the current as it warms up - if the current
drops off then it's probably OK to connect to ignition switched 12V supply.
My experience is mainly Bosch Motronics, this is what they do.

Rich

> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Will McGonegal
> Sent: 31 January 2000 23:41
> To: diy_efi at diy-efi.org
> Subject: Mopar heated O2 sensor question
>
>
> I have a four wire heated O2 sensor from a Chrysler (p.n.
> 5233088).  I believe that the
> heater inside it can be powered continuously by 12 volts.  Does
> anyone know if this is
> not the case?  Perhaps there is a more complex scheme for
> regulating the sensor
> temperature that I am not aware of (e.g.. measuring current and
> voltage into heater,
> calculating resistance, therefore knowing the temperature).
>

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