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O2 sensor ? AMM or ECU bad ?

posted by  someone claiming to be pete on  Tue Jan 21 23:50 CST 2003 [RELATED]

I get voltage readings when checking an O2 sensor with a digital multimeter barely any movement on when using an analog ( needle type on a 1v scale ) . Is this normal ? If the adusting AMM idle mixture screw does not affect CO , could my AMM or ECU have gone bad ? I am in real nedd of some troubleshotting help - thanks


(Unfortunately all I have is a Haynes manual)








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    O2 sensor ? AMM or ECU bad ?

    posted by  someone claiming to be Herb Goltz on  Wed Jan 22 02:54 CST 2003 [RELATED]

    Pete:

    Your 02 sensor measurements might not be a problem-- whatever multimeter you use it MUST be a high impedance device (say 20M ohm) to give an accurate reading. Many analog meters aren't high impedance, which would cause the discrepancies in your measurements...

    With the car warm and at idle, you should measure voltages between 0.1-0.9VDC, fluctuating at around 1Hz (once per second).

    Good luck!

    Herb Goltz, London, Ontario, Canada '89 760GLE w/170K mi







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