Micro Squirt O2 Sensor, Picking up False Signal Options

[Mblizzard]

My O2 gauge is getting some really bad values. I have a dash mounted gauge that seems to be reading correctly but the ECU is seeing values that range from 0.4 to 22 in less than 1 second.



In fact I disconnected the O2 gauge from the ECU and it was still getting the same signal. I even installed a new O2 sensor and got the same results.


Any thoughts on solving this?

[Mblizzard]

OK so I am no expert when it comes to chasing down where the electrical pixies go.

But for the Micro squirt, it uses a common ground for all of the sensors that feeds back into the ECU to prevent grounding problems. The coolant, intake air temp, MAP and O2 sensor all use the same ground.

These seem to be function correctly and that ground is internal to the ECU so there is no way to alter or improve the ground.

The O2 sensor is function correctly as indicated by the dash gauge and there was previously reasonable agreement between the ECU O2 reading and the gauge.

With the O2 sensor completely disconnected from the ECU it is still getting a signal that is exactly the same signal and wildly fluctuating reading that I see with it connected.

So this indicates to me there is something in the ECU that is not right.