imported_Polish_tom

Does anyone know how the O2 sensor is grounded on a 93" civic HB?

Cause my O2 Voltage is Wack and i just changed it too

it's making me goooo crazy it bogs out soooooo much!!!




Please help and thank you

1sloweg

The o2 sensor itself is case grounded to the exhaust (in some situations i would hav eto check a diagram)

O2 sensor voltage to be very erratic when it is working well. It should cycle from 150+ mv all the way up to 900mv constantly 8 cycles per second.


Why do you think it is an o2 problem......

you will not be able to test it with a normal multimeter, I have a full function oscilliscope i use to test o2s on pre obd2 vehicles

The only thing you have to know for on o2 is is the following

on your car it is a 4 wire

2 wires will be 12v power and a ground wire.. This is for the o2 heater which makes the o2 sensor come to temperature quicker. the other wires will most likely be a signal to the ecu and a reference wire.

imported_Polish_tom

I know it's a problem with the O2 because i hooked up the car computer with the snap-on diagnostic computer and it showed the code "low voltage to O2 sensor"

I went to active data and it showed my car idleing at about 39mV and when i rev it, it goes to 0Mv...