TheDude Posted March 23, 2015 Posted March 23, 2015 I finally got around to running my new (to me) scanner on my MJ. It's really cool how it shows all values and data. So, I made a video of my specs with the truck running and at operating temperature. I've been having an erratic idle issue for a while and just before I took this video I finishing installing my new wiring from Kelleyswip.com, the TPS was adjusted prior to this. The only possible issue I found today was my O2 sensor wiring slightly melted on the intake due to it not being it's holder, but the scanner still shows voltage from it.. Basically, if anyone can decipher anything from this, I'd be eternally grateful. https://vimeo.com/122933173
cruiser54 Posted March 23, 2015 Posted March 23, 2015 I can't see it worth a hoot. O2 sensor should switch rapidly between Rich and Lean. Not give one voltage.
TheDude Posted March 23, 2015 Author Posted March 23, 2015 According to the scanner the O2 is staying at 4.77 volts.
cruiser54 Posted March 23, 2015 Posted March 23, 2015 According to the scanner the O2 is staying at 4.77 volts. It should be switching fairly rapidly from about 1.1 to 4.9 if the O2 sensor is any good.
yxmj Posted March 23, 2015 Posted March 23, 2015 Be easier to read if 1) it was not sideways 2) There was not massive glare off the screen. Try and re-post I would be interested to see it correctly
TheDude Posted March 24, 2015 Author Posted March 24, 2015 Sorry you guys are having trouble seeing it. It plays much more clearly on my phone, which is also why it was sideways.. I'll try again when the weather gets better.
HOrnbrod Posted March 24, 2015 Posted March 24, 2015 According to the scanner the O2 is staying at 4.77 volts. It should be switching fairly rapidly from about 1.1 to 4.9 if the O2 sensor is any good. The DC meter movement can't switch that fast, so it's averaging the pulsing AC sine wave output. The only way you can see the switching is with an A/F meter or synced to an oscilloscope or spectrum analyzer. OP, can you see the voltage change when transitioning from open to closed loop?
TheDude Posted March 24, 2015 Author Posted March 24, 2015 Wasn't watching when it did, I'll check it next time. What should I see when it changes?
HOrnbrod Posted March 24, 2015 Posted March 24, 2015 You should see the meter at 0V when first started then the voltage go up slowly as the O2 sensor starts passing traffic if the meter is monitoring the sensor output. I have no idea how it's wired in..........
cruiser54 Posted March 24, 2015 Posted March 24, 2015 You should see the meter at 0V when first started then the voltage go up slowly as the O2 sensor starts passing traffic if the meter is monitoring the sensor output. I have no idea how it's wired in.......... OP should see O2 sensor voltage fluctuate rather rapidly from .1 to 4.9 volts rapidly as previously stated. If the voltage remains "stagnant" the O2 sensor is bad. simple.
TheDude Posted March 25, 2015 Author Posted March 25, 2015 Here's two more videos, hopefully easier to read too. The first one starts from key on, then running at idle. https://vimeo.com/123259062 The second video is it running at idle fully warmed up. https://vimeo.com/123259132
cruiser54 Posted March 26, 2015 Posted March 26, 2015 YOu need to change the mode to SAE instead of mumblemeters.
TheDude Posted March 26, 2015 Author Posted March 26, 2015 Damn, I didn't notice that.. I only noticed the being in Celsius part.
TheDude Posted March 26, 2015 Author Posted March 26, 2015 I'll try again to do it correctly tomorrow once the sun comes back. But the voltages should be the same right?
HOrnbrod Posted March 26, 2015 Posted March 26, 2015 How is it wired in? Can you post a wiring diagram?
TheDude Posted March 26, 2015 Author Posted March 26, 2015 The scanner hooks into the yellow diagnostic ports near the battery, if that's what you mean.
TheDude Posted March 26, 2015 Author Posted March 26, 2015 Yes, sorry. Did my signature not post on here? I can't tell since I'm stuck using the app because my computer died.
HOrnbrod Posted March 26, 2015 Posted March 26, 2015 Yes, your sig is there. Just didn't know it simply plugged into the diagnostic port - must have missed that. I thought it might be hardwired in like an A/F meter.
TheDude Posted March 29, 2015 Author Posted March 29, 2015 I figured it out! Here's the video from right before replacing the O2 sensor: https://vimeo.com/123570130 And now the video right after replacing the O2 sensor: https://vimeo.com/123570183 Now the O2 volts go up and down, along with the fuel mix going rapidly Rich/Lean like it should. Thanks for all your help guys!
cruiser54 Posted March 30, 2015 Posted March 30, 2015 I figured it out! Here's the video from right before replacing the O2 sensor: https://vimeo.com/123570130 And now the video right after replacing the O2 sensor: https://vimeo.com/123570183 Now the O2 volts go up and down, along with the fuel mix going rapidly Rich/Lean like it should. Thanks for all your help guys! Amazing!! Good job.
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