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Is that a joke? Or do you call them wrenches (not to be confuseds with wenches).
The stock sensor outputs a 0-1V signal depending on how much oxygen it sees in the sees in the exhaust. This is a narrowband signal. The AEM sensor outputs a 0-5V signal (wideband) but the controller (in your case it's in the gauge) can output a 0-5V signal for ECUs like the AEM EMS, but also puts out a 0-1V signal to mimmick the stock sensor. You connect the 0-1V signal to where your OEM ECU expects a signal from the stock sensor and it is none the wiser!
It's a feature of the AEM wideband and is adequately documented in the instruction manual. That's where I got it from.
stock honda s2k ecu will not read the aem uego 0-1 V signal. You will get a cel if you disconnect the oem O2 sensor and hook up the aem uego to the stock ecu.
(Edited out the first line since I merged this from another thread. - XV)
The AEM UEGO (both gauge and standalone versions) can output a narrowband signal (0-1V) specifically for ECUs that require this range. The benefit is that you don't have to remove your header and have another bung welded into it. Just unscrew the stock sensor and screw in the AEM.
The question is, is the slope of the output compatible with the stock sensor? That is, at the various data points does the AEM narrowband signal put out the same (or approximately thes ame) voltage as the stock sensor?
Secondly it was also pointed out that the ECU will throw a CEL if it doesn't see a load on the sensors heater circuit. I did a bit of a search and in a thread about using a test pipe in place of the catalytic converter Modifry suggests using a 12ohm 25W resistor across the white wires to the sensor. The other alternative is to have the stock sensor connected but not screwed into the exhaust.
Is anyone actually doing this and is it reliable? It's not actually relevant to me because I use the AEM ECU but to others I'm sure it would be.
It has been requested that since this thread contains very useful information and continuity would be lost if a new thread was started, I have decided to edit out all the offending posts and re-open this.
To the offending user: Come back with another user name at your peril!
Aus, while I haven't run a resistor on the primary 02 heater, but I have done so on the Secondary. I used an E-bay sourced wire wound resistor. This coupled with the ECG 02 simulator kept the CEL off, and a $200 sensor out from under the car doing nothing. I was using a E-manage and test pipe at the time.
The Primary and Secondary 02's have different resistance values of the heater elements.
I used a 13ohm, 10 watt resistor to simulate the secondary 02 heater.
Here it is:
While I did not have my AEM sensor's 0-1V input wired to the PCM, (my Toda header had a 2nd 02 bung allready there) I would have persued using that option if I was using the stock header.
I have a HKS header arriving in a few days so I'll install my standalone (or gaugeless) AEM UEGO then. Strangely enough I'll be connecting the wideband output to the AEM ECU and the narrowband to an old gauge I made from a kit some time ago. Not sure what good that will be but it will be some pretty lights until I get a compatible wideband gauge.
02-03-2005, 08:57 PM
Or do you call them wrenches (not to be confuseds with wenches).
