Vishnu DIY: o2 simulator

O-cha · 07-31-2008, 11:07 AM

Quote:

Originally Posted by scalbert

One other thing I was considering while trying to go to sleep last night was the dependance on one sensor to fool both circuits. I wonder if, in certain situation, the DME expects something different from each bank. The peak to peak values could be different on the input but with only one sesnor being used, the output for each bank would be indentical.

If so, just installing a voltage divider for each sensor would work. I'll probably do it this way regardless; you don't purchase resistors individually anyway.

Just a thought...

It does, remember we talked about this. "muddled signal" is part of the wording. Wouldn't fix the other issue though.

scalbert · 07-31-2008, 11:18 AM

Quote:

Originally Posted by O-cha

It does, remember we talked about this. "muddled signal" is part of the wording. Wouldn't fix the other issue though.

I do not not think the other issue you are refrring to has anything to do with peak to peak levels. Using a voltage divider will shift the waveform down in it's DC offset and will reduce the peak to peak delta. I do not see the change in delta being an issue though as it can change more than the percentage described on its own.

That said, I wonder if the issue you saw has more to do with the frequency. I know the frequency of a switching O2 sensor does change when it is behind a catalyst. Perhaps that may explain issues some have seen.

Regardless, I'll be down this road soon enough and if I encounter any issues, thankfully I have the tools to look into it; handheld scopes, etc.

NM_BMW · 11-12-2008, 07:07 PM

I'll be doing this in about two weeks when I get my downpipes in, but I had a few questions.

This DIY still applies to v3.1 maps correct?

Also, If I still have my V2 harness, can I use the male and female ECU pin outs to make the O2 sim? Then all I have to do is extract the straight black wires from the PNP harness and put in my home made O2 sim. This eliminates me hacking up my V3 PNP Harness.

kaji335i · 11-12-2008, 07:19 PM

Yes, it works with 3.1, and yes u can use the wires from an old harness so u don't have to splice the v3 harness. That is exactly what I did few weeks ago and it works like a charm.

NM_BMW · 11-12-2008, 07:21 PM

Quote:

Originally Posted by kaji335i

Yes, it works with 3.1, and yes u can use the wires from an old harness so u don't have to splice the v3 harness. That is exactly what I did few weeks ago and it works like a charm.

Cool. You used the exact ohm rated resistors as mentioned?

OpenFlash · 11-12-2008, 08:00 PM

I'm running this DIY o2 sim in my v3.1 car as well

shiv

NM_BMW · 11-12-2008, 09:43 PM

Quote:

Originally Posted by shiv@vishnu

I'm running this DIY o2 sim in my v3.1 car as well

shiv

Cool. Looks like I'm going to Radio Shack soon

SoQuick · 11-12-2008, 10:33 PM

Excellant DIY

SfValley335i · 11-12-2008, 10:43 PM

Quote:

Originally Posted by Humtek

Cool. Looks like I'm going to Radio Shack soon

I'll be doing this tomorrow...

kaji335i · 11-12-2008, 11:49 PM

Quote:

Originally Posted by Humtek

Cool. You used the exact ohm rated resistors as mentioned?

Sure did, followed this DIY and made a patch-in cable with my old v2 harness wires, removed the wires from the harness and put mine it. Takes less than 10 mins and is much better than paying $100 for a o2 simm.

NM_BMW · 11-14-2008, 01:39 PM

What happened to the pictures?

OpenFlash · 11-14-2008, 01:42 PM

Quote:

Originally Posted by Humtek

What happened to the pictures?

? They are still there

NM_BMW · 11-14-2008, 01:56 PM

Quote:

Originally Posted by shiv@vishnu

? They are still there

NVM. had to flush my DNS.

ontopofm · 11-30-2008, 02:19 PM

how long does it take before the SES light goes away?

SfValley335i · 11-30-2008, 02:35 PM

Quote:

Originally Posted by ontopofm

how long does it take before the SES light goes away?

SES light doesnt just go away after you install the O2 sims. You must clear the code first and it will not come back when the O2 sims are on the car.

OpenFlash · 11-30-2008, 02:55 PM

+1

ontopofm · 11-30-2008, 02:59 PM

I just plugged in C-Reader and got codes
036: HO2S Heater Control Circuit (Bank 1 Sensor 2)
040: ?
161: O2 Sensor Heater Circuit (Bank 2 Sensor 2)
Codes display have been repeated 4+ times but didnt clear automatically, Is there any way to clear them?

SfValley335i · 11-30-2008, 03:02 PM

Quote:

Originally Posted by ontopofm

I just plugged in C-Reader and got codes
036: HO2S Heater Control Circuit (Bank 1 Sensor 2)
040: ?
161: O2 Sensor Heater Circuit (Bank 2 Sensor 2)
Codes display have been repeated 4+ times but didnt clear automatically, Is there any way to clear them?

Press start without hitting the Brake pedal. Let the power to the dash come on (ignition on).

Then go ahead use the C-reader to read the codes and clear them. Pull the key out and then turn on the car....

ontopofm · 11-30-2008, 03:11 PM

Quote:

Originally Posted by SfValley335i

Press start without hitting the Brake pedal. Let the power to the dash come on (ignition on).

Then go ahead use the C-reader to read the codes and clear them. Pull the key out and then turn on the car....

codes cleared, thanks

Alex@AKMotorwerk · 11-30-2008, 03:38 PM

Quote:

Originally Posted by ontopofm

I just plugged in C-Reader and got codes
036: HO2S Heater Control Circuit (Bank 1 Sensor 2)
040: ?
161: O2 Sensor Heater Circuit (Bank 2 Sensor 2)
Codes display have been repeated 4+ times but didnt clear automatically, Is there any way to clear them?

i also get the 036: HO2S Heater Control Circuit (Bank 1 Sensor 2)
I clear them with c-reader and that same code comes back after a day or so. Seems like i have a bad 02 sensor. Let me know if you find out what is causing that code to come up... Thanks

ontopofm · 11-30-2008, 06:47 PM

Quote:

Originally Posted by nj323ci

i also get the 036: HO2S Heater Control Circuit (Bank 1 Sensor 2)
I clear them with c-reader and that same code comes back after a day or so. Seems like i have a bad 02 sensor. Let me know if you find out what is causing that code to come up... Thanks

i managed to put a dent on the front right sensor, im praying it doesnt damage what is inside, has anyone changed out the sensor before? how pita is it?

scalbert · 11-30-2008, 06:49 PM

Quote:

Originally Posted by ontopofm

has anyone changed out the sensor before? how pita is it?

You have already done the hardest part. The rest is under the engine cover and is just a connector. Edit, that is for the front sensors. The connector for the rear sensors is just to the left of the sensors

11-12-2008, 07:07 PM	#69
NM_BMW Vishnu Powered 68 Rep 2,205 Posts Drives: 335xi, S1000RR Join Date: Nov 2007 Location: Proceding iTrader: (7)	I'll be doing this in about two weeks when I get my downpipes in, but I had a few questions. This DIY still applies to v3.1 maps correct? Also, If I still have my V2 harness, can I use the male and female ECU pin outs to make the O2 sim? Then all I have to do is extract the straight black wires from the PNP harness and put in my home made O2 sim. This eliminates me hacking up my V3 PNP Harness. __________________ 2008 335xi Sedan \| Titanium Silver \| Black Dakota PROcede v5 \| Vishnu Exhaust \| BMS DCI \| AR Catless DPs \| Helix FMIC \| Stett Charge w/ Tial BOV \| MORR VS8s \| KWv3
	Appreciate 0

11-12-2008, 07:19 PM	#70
kaji335i Lieutenant Colonel 36 Rep 1,896 Posts Drives: e92 335i Join Date: Nov 2006 Location: that place iTrader: (0)	Yes, it works with 3.1, and yes u can use the wires from an old harness so u don't have to splice the v3 harness. That is exactly what I did few weeks ago and it works like a charm.
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11-12-2008, 08:00 PM	#72
OpenFlash 1737 Rep 17,960 Posts Drives: A Lot Join Date: Sep 2006 Location: SF Bay, CA iTrader: (0) Garage List 2018 Ducati Panigal ... [0.00] 2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00]	I'm running this DIY o2 sim in my v3.1 car as well shiv
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11-12-2008, 10:33 PM	#74
SoQuick Stock 10 Rep 243 Posts Drives: Nothing now Join Date: Nov 2008 Location: Southern NH iTrader: (0) Garage List 2009 135i [0.00] 2001 S8 [0.00]	Excellant DIY
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11-14-2008, 01:39 PM	#77
NM_BMW Vishnu Powered 68 Rep 2,205 Posts Drives: 335xi, S1000RR Join Date: Nov 2007 Location: Proceding iTrader: (7)	What happened to the pictures? __________________ 2008 335xi Sedan \| Titanium Silver \| Black Dakota PROcede v5 \| Vishnu Exhaust \| BMS DCI \| AR Catless DPs \| Helix FMIC \| Stett Charge w/ Tial BOV \| MORR VS8s \| KWv3
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11-30-2008, 02:19 PM	#80
ontopofm Lieutenant Colonel 76 Rep 1,548 Posts Drives: stock Join Date: Jun 2007 Location: CA iTrader: (4)	how long does it take before the SES light goes away?
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11-30-2008, 02:55 PM	#82
OpenFlash 1737 Rep 17,960 Posts Drives: A Lot Join Date: Sep 2006 Location: SF Bay, CA iTrader: (0) Garage List 2018 Ducati Panigal ... [0.00] 2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00]	+1
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11-30-2008, 02:59 PM	#83
ontopofm Lieutenant Colonel 76 Rep 1,548 Posts Drives: stock Join Date: Jun 2007 Location: CA iTrader: (4)	I just plugged in C-Reader and got codes 036: HO2S Heater Control Circuit (Bank 1 Sensor 2) 040: ? 161: O2 Sensor Heater Circuit (Bank 2 Sensor 2) Codes display have been repeated 4+ times but didnt clear automatically, Is there any way to clear them?
	Appreciate 0