o2 sensor chevy metro 99 testing

[kevin]

I watched ETCG video and well i think i have the one or two wire o2 sensors ,,it looked like he used the ohm at 200k i guess to check resistance if there is 2 wires ,i thought the red and black i guess , to test the sensor, o, this was the check light reading o2s,

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[Kevin Criswell]

you should have the 4 wire sensor.

2 blacks, a white and a blue wire.

One of the blacks is a 12 volt feed wire to the heater the other is grounded by the PCM to energize the heater. The white wire is the ground for the actual sensor and the blue is the signal wire to the PCM.

[kevin]

[quote=”Raistian77″ post=82173]you should have the 4 wire sensor.

2 blacks, a white and a blue wire.

One of the blacks is a 12 volt feed wire to the heater the other is grounded by the PCM to energize the heater. The white wire is the ground for the actual sensor and the blue is the signal wire to the PCM.[/quote] on the o2 sensor which wires do i check the with the ohm meter to check if the o2 is good ,,is it the whit and blue that i touch the meter positive and negative ?

[college man]

You would ohm out the two blacks. The with the key on engine
off. Meter on 20 dc volts test for 12volts on the two blacks.

[kevin]

[quote=”college man” post=82220]You would ohm out the two blacks. The with the key on engine
off. Meter on 20 dc volts test for 12volts on the two blacks.[/quote] that would tell me if i am getting power to the 02 sensor from the pcm,right / ETCG was checking the o2 sensor it’s self for resistance unplugged with ohm to see if the o2 was working or dead or to high or ,a new o2 should have about 16 to 20 resistance any more ill be bad thank you

[kevin]

thanks

[Kevin Criswell]

[quote=”geogeougo” post=82192][quote=”Raistian77″ post=82173]you should have the 4 wire sensor.

2 blacks, a white and a blue wire.

One of the blacks is a 12 volt feed wire to the heater the other is grounded by the PCM to energize the heater. The white wire is the ground for the actual sensor and the blue is the signal wire to the PCM.[/quote] on the o2 sensor which wires do i check the with the ohm meter to check if the o2 is good ,,is it the whit and blue that i touch the meter positive and negative ?[/quote]

Here is a video Eric did on O2 sensor basics

Here is one I did on o2 operation and I do an on car test showing engine running conditions

[Author]

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