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P25-l3 Push the MIN/MAX button to view rhe<br />
minimum oxygen sensor voltage reading (59. I mV). This<br />
minimum reading should be less than 200 mV.<br />
=:=.=ff<br />
P25-14 Push the MIN/MAX button again to view the<br />
average oxygen sensor voltage reading. This reading<br />
(449.8 mV) is average and indicates that the engine is<br />
operating correctly. An average reading below 450 mV<br />
indicates that the engine is operating too lean,whereas<br />
a reading higher than 450 mV indicates that the engine<br />
is operating too rich.<br />
P25- L5 After testing, carefully remove the meter, test<br />
leads, and T-pin used for testing.<br />
P25-15 On a 1996 or newer OBD llvehicle,allof the<br />
heated oxygen sensors can be tested at the same time<br />
by using a scan tool. A Tech 2 is being used on the OBD<br />
ll vehicle; the screen showing oxygen sensor data should<br />
be selected before turning on the ignition (engine off).<br />
P25-17 Carefully watch the bias voltage sent to rhe<br />
oxygen sensors by the vehicle computer as the ignition<br />
is turned on (engine off). As the heaters inside the<br />
oxygen sensors work, the sensors become more<br />
conductive to ground and the voltage should drop.<br />
P25-18 After about three minutes, all sensors should<br />
show about the same low voltage. A sensor that<br />
remains high could be the cause of a hard-to-find<br />
driveability problem yet not trigger a diagnostic trouble<br />
code (DTC).<br />
621
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