4kq fuel pump relay question & O2 sensor reading

Huw Powell human747 at attbi.com
Tue Dec 3 20:35:57 EST 2002

> 2.  I know the settings on O2 sensor ranges (.2 to .7 fluctuating
> continually) but I've noticed that you can turn the adjustment screw several
> times either way, rich or lean, and the computer makes the adjustment fairly
> quickly afterward.  So how are you suppose to know where to set the mixture.

When the mixture is set right, the current to the control pressure
actuator should oscillate around 10 mA.

pictures of how to test near the bottom of this file:


Huw Powell



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