[callahan9119]

Yes that is a Digital Multifunction Meter, aka DMM or voltmeter. That is the sort of device needed.
It can measure DC and AC voltage, Current, Resistance, Continuity(beeper), diode check, etc.
i see sharp point tips on the probe wires, may look for some with alligator clips to connect without holding all the time.
Very handy and necessary when doing troubleshooting on electrical issues. Lots of video on the tubes about how it works, how to use.

Thank you!

 

[callahan9119]

Not too bad, the harness runs from the sensor to the main bundle underneath the intake manifold thru the firewall on the passenger side to the ECM behind the glove box. So the continuity (beeper test) of the blue wire could be checked with a meter from the ECM connector to the sensor connector.

The resistance of the heater element could be checked with a meter, both old and new sensors, likely to get the same reading (expected to be the same).

The power comes from the EFI Relay from the EFI fuse (20A ?), so a measurement of the voltage at the +B sensor connector to chassis should read the +12V battery system voltage.

A dirty or corroded connector should be obvious when compared to a normal or clean connection--dirt, rust, blue or green deposits, etc, Can be cleaned with a metal scribe, vinegar on a swab, followed by solution of baking soda in water on a swab, followed by alcohol or contact cleaner spray, then blown out with air.

The voltage measurement of the blue wire to chassis would be made by back-probing the connector while connected and engine is running, takes a bit of careful setup for this one.

Is this what I need to check voltage?

 

[callahan9119]

Not too bad, the harness runs from the sensor to the main bundle underneath the intake manifold thru the firewall on the passenger side to the ECM behind the glove box. So the continuity (beeper test) of the blue wire could be checked with a meter from the ECM connector to the sensor connector.

The resistance of the heater element could be checked with a meter, both old and new sensors, likely to get the same reading (expected to be the same).

The power comes from the EFI Relay from the EFI fuse (20A ?), so a measurement of the voltage at the +B sensor connector to chassis should read the +12V battery system voltage.

A dirty or corroded connector should be obvious when compared to a normal or clean connection--dirt, rust, blue or green deposits, etc, Can be cleaned with a metal scribe, vinegar on a swab, followed by solution of baking soda in water on a swab, followed by alcohol or contact cleaner spray, then blown out with air.

The voltage measurement of the blue wire to chassis would be made by back-probing the connector while connected and engine is running, takes a bit of careful setup for this one.

Thank you! This has been very helpful, hopefully I can figure this out.

 

[callahan9119]

That code is for a "low" signal on the heater circuit of the upstream "O2" sensor, that is to say more accurately, the Air/Fuel Mixture Ratio Sensor.

Check the connector for corrosion and the wiring for cracks or rodent damage. The ECM sends out the current to drive the heater power and also provides the ground return path, then measures the current to determine if it is within spec. That code is thrown when the measurement is not within the expected range.

OK thanks, I will. If my wiring is bad on the female side, is that a giant can of worms?

 

[callahan9119]

Can you measure voltage with meter?

I don't, but I'm sure he has something that can. I'll look into that. Do I just stick it by the male female connection? How do I tell if maybe the female part is maybe corroded?