1998 O2 sensor

[Garfield Willis]

On Wed, 28 Jun 2000 21:11:30 -0400, Len Sabatine <sabatine at epix.net>
wrote:

>    About every 100 seconds the VCM compares the switching time intervals 
>of the 4 HO2S,
>it also uses the L&R Bank 2ndary HO2s to "Monitor" cat Oxygen Content Ratio.
>In OBD2, if the VCM can't get all 4 switch " Expected" responses in"time" , 
>then expect
>at the very minimum  S hort T erm and L ong  T erm Fuel Trim Adjustments. 
>There's
>more , I'd say give the VCM what it wants and use the 4 Heated Oxygen Sensors.
>All this information and more is defined in S.A.E. J1850 Specification [s] 
>, Heated
>Oxygen Sensor  Tests and Diagnostics. Failure of the heater circuit can 
>also cause
>Scew of the Fuel Trim Adjustments. This is the basics , gets more 
>complicated  going
>forward !

Fascinating!

Gar


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