O2 sensor unplugged voltage readings are still being displayed
I'm in the process of converting my 351w to tbi (gm fuel injection). All sensors are in place, the wiring harness and ECM are installed. Because this is being used in a boat, I am not using:
vss
egr
knock
any transmission related ssensors
anything related to air conditioning
I've downloaded tuner pro rt and purchased a serial cable. I've started to datalog and noticed something strange. I'm using a wide band o2 sensor to see my afr. The narrow band o2 sensor is unplugged. I am still seeing o2 crosses and voltage readings while data logging. How can this be, there is no o2 sensor information being sent to the ECM, right? I would also assume a error code would of been tripped.