more AFM details

["Scott Williams" <scwillia@genuity.com>]

I sourced this from the Mazda 323GTX list:
"The output of the O2 sensor can only be measured with a good quality 
digital meter. Analog and cheap digital meters load down the sensor 
output forcing the voltage to 0 volts. Basically all O2 sensors are 
the same and interchangable. The newest ones (3 and 4 wire) have 
built-in heaters which gets them up to operating temperature faster 
after starting, which gets the ECU into closed-loop operation faster, 
which reduces emissions faster than waiting for the exhaust to heat 
it to temp. Other than that, they're all the same. (there are 
wide-range precision calibrated ones for emissions and performance 
testing, but these are not used in engine management systems.)"
______________________________
Scott F. Williams
Account Manager
GENUiTY - Eastern Region
100 Wall Street, 10th Floor
New York, NY 10005
Voice: 212.416.1745
Cell: 917.648.2256
Fax: 212.618.5160
scott.williams@genuity.com

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