ZW99GT

So I hooked up my SCT livelink on the laptop today, and it was showing 02 sensor bank2 front reading 0 volts. Bank 1 was reading fine. So I took out the old one, threw in a new one, reset the battery, all that good stuff. Still reading 0 volts. The code is throwing P1151. It's running very very rich, and WILL NOT idle at all. The RPMS will jump around from 500-1500, then it will go dead 50% of the time.

So where do I go from here? Where does the 02 hookup go to? The ECU? I guess my next move is to replace that wire. Any help would be appreciated.


P.S. I graphed the MAF voltage also, it's reading 0. Would this have anything to do with the above?

GodAmGT00

Traditionally, as youmore than likelyknow, when you lose O2 voltage, the car goes to "limp mode," to prevent a potential lean condition.. Now, MAF voltage being 0 is sort of weird.. I'm not sure if the 2 correlate, and the car stops using MAF readings in limp mode or if you have a larger problem..O2's should go directly to the PCM, but I don't have a wiring diagram to see if there's another junction. I wouldn't think so, since they're such low voltage...


My guess is that the harness end that goes to the PCM is definitely bad, maybe melted on hot exhaust, or constantly rubbing against something..Definitely one of the first things I'd check though..



JT

ZW99GT

Thanks man. I may just replace the PCM and most of the wiring.

GodAmGT00

Whoa... A little nutty, but I think I understand why..

Do you have an aftermarket MAF?? I thought you might because, don't you run NO2??



JT

ZW99GT

Yes I have a GMS MAF.

GodAmGT00

Gotcha.. Let me dig around a little bit.. I think I might have the powertrain wiring diagram.. At least I can get you a pin-out of the O2's, and you may be able to go to the harness under the hood and see if you can do a continuity check on the wires.. At least that way you can rule out a MAF related issue.. How old's the MAF?? I was just doing some reading, and some folks have had similar issues when the MAF filaments get a little dirty, causing the car to go lean... It's another simple way to rule out MAF related issues....



JT