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#1
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DME: Trimming, oxygen sensor before cat., Bank 2
Load PCT: 5.5% ECT: 203F SHRTFT 1: varied between -1.6 to -3.1% LONGFT 1: 6.3% SHRTFT 2: varied between 0 to -3.9% LONGFT 2: 7.0% RPM: varied 774 to 781 Spark Adv: varied -2.5 to -3.5 IAT: 151F MAF: .01lbs/s (calculates to 4.54 grams) TP: 9.8% O2B1S1: varied .130 to .730V SHRTFTB1S1: varied -1.6% to -3.1% O2B1S2: varied .750 to .770V SHRTFTB1S2: 99.2% O2B2S1: varied -.135 to .750V SHRTFTB2S1: varied 0 to -3.1% O2B2S2: varied .720 to .750V SHRTFTB2S2: 99.2% Thanks for any help you guys can provide. I'm not even sure where to start. |
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#2
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O2 can't range to negative values. The precat if reading negative values something is wrong. Looks like a case of problem sensor.
Also: post cat should gravitate to 0.45V so the 0.75 is very high but that can vary a lot. What I would do: reset all the sensors by unplug them all, start the car run until you get multiple errors (probably missing O2 heater error) then plug them back in and clear the codes. See if the numbers will come back into normal range (0.1 to 0.9v). If you get values outside of normal you probably need to replace the sensor (use OE or OEM don't cheap out: I need to replace my knock off sensors)
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#3
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Quote:
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#4
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So if you are getting out of possible range it's either a bad sensor or problem in the ECU. The easy test is swapping the two pre cat sensors and resetting adaptations (or as described above recalibrate the DME)
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#5
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I just tried recalibrating the DME and resetting adaptations. No change.
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#6
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I'll try swapping the sensors this weekend if the weather cooperates.
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#7
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Swap the pre cat sensors and see if the problem migrates. It feels like a bad new sensor to me.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#8
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I'll try it. I hope that's all it is. FCP will replace it for free!
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#9
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Quote:
The post cat 02 voltage should be at a constant value whereas the pre cat 02 sensor the voltage will vary. Here's a video on 02 sensors as it relates to voltage https://www.youtube.com/watch?v=zyh_4SktmFM
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#10
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Here's a video on STFT vs LTFT. You can see that the STFT is negative because the LTFT is positive and the DME is trying to zero out the fuel trim.
https://www.youtube.com/watch?v=WMSM7WAbBss
__________________
2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
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