Switch ratios

[David A. Cooley]

OOOH OOH  MEMEMEMEME!!!

The PCM looks at the Stoich crossings of the pre-cat O2 and the post cat
O2...
Post cat most likely will be pretty steady.  If the post cat starts swinging
it's output close to what the pre-cat sensor see's, then it flags a cat
failure.  PCM will have params on how close the post-cat O2 must be in
cycling to the pre-cat to set the code.


There... 70 words!


-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: Thursday, April 01, 1999 10:24 AM
Subject: Switch ratios


>Can someone in 100 words or less explain what a swtich ratio is?.
>This is in reference to comparing O2 sensors (post-pre cat converter).
>Thanks
>Bruce
>
>