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WBO2 Datalogging within ECU

Old 05-28-2004, 01:11 PM
  #1  
1.0 BAR
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Default WBO2 Datalogging within ECU

Since there is a problem correlating the external WB data with the internal RPM and Map readings from the ECU, I was wondering if it possible to plug the WB into the coolent temp wire (is it 0-5V) OR use a voltage divider to scale the voltage output down on the wideband to 0-1V and then feed that into the existing O2.
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Old 05-28-2004, 03:26 PM
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Default Re:WBO2 Datalogging within ECU

Both are fieble, but neither will give you the result you want.

The problem with reading WBO2 data is that we can't accept 0-5 volts. Stock it reads ~3.8v (Hondata findings) which is about 17:1 or something.

We basically just need to get the code to not "flip out" when it gets a reading over 1 volt. Then code has to be written to scale it to narrowband for use in the original closed loop routines.

These things are int he works..
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Old 05-28-2004, 11:46 PM
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Default Re:WBO2 Datalogging within ECU

i was just wondering if i could do this until the ROM can nativelly accept the wideband signal. I was gonna make a voltage divider and scale the resistance to 0-1V and then feed it into the stock O2 input. Then I was gonna convert the scaled down voltage to AF.

The other possibility was to use the stock water temp input but i wasnt sure if the ecu used this info for any rutines/adjustments or what the voltage scale was.

Thanks for taking your time to resond to a nerd
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Old 05-29-2004, 02:39 AM
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Default Re:WBO2 Datalogging within ECU

Ya.. ECT and IAT will throw check engine lights, and inhibit the vehicle from running.
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Old 05-29-2004, 03:00 PM
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Default Re:WBO2 Datalogging within ECU

I bought a breadboard and will be making a voltage divider and feeding the Vout into the stock O2 input. R1/R2=4 to cut the 5V to 1V. Stoik is then .5V like narrow. The only concern is that the ECU will throw a code because the slope on the voltage is reletively flat compaered to a narrowband and it will always think its reasonably close to stoik. This might only work for tuning abouve 80% throttle. Anyone have any thoughts...Ill keep everyone updated. Maybee on the plus side itll always think its close to stiok and then not do a whole lot of internal adjustments.

Heres a diagram of a voltage divider
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