After thoroughly warming up the car (by driving, not at idle), leave the
engine running and put a high impedance voltmeter between the oxygen
sensor signal wire and ground. The voltage should vary 3-4 tenths of a
volt up and down centered around .45V several times per second. Or, put
another way the voltage should vary from about .1 up to .8.
--
Mike F.
Thornhill (near Toronto), Ont.
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
