obd2 + wideband anyone?

[skatanic28]

the time has come to attempt to pass some inspection horse****. ive tossed the stock ecu back in to see what i have to do for it to be "legal". so far, ive only gotten a 0901, which is for the front o2 sensor heater. i have my zeitronix zt-2 emulating the narrowband output to the ecu for the time being, which i guess is either causing problems with the heater circuit for the o2 sensor, or the narrowband output is screwing things up. is anyone running a wideband without error codes? i know i could pick up a stock sensor and run that for a week if theres no other way.

[SloMoe]

The problem is probably because your emulating the narrowband signal with you wideband meter. The stock O2 sensor has a heater circuit built in. Its picking up that you have an O2 sensor because of the emulated signal, but not the heater circuit because you dont have the actual sensor hooked up.r

[BillKlineVT]

just plug in the o2 sensor into the plug and have it chillin in the engine bay... the heater circuit is seeing that there is an open circuit since the actual o2 sensor isnt plugged in, thus throwing the code. Keep the wiring the same from your wideband to emulate the narrowband signal....

That should get that code to go away

[Import_Ant]

S13FX posted a good link about this recently.

http://www.plxdevices.com/AppNotes/PLXApp004.pdf

Quote »8. install a 20 watt, 10 ohm load resistor to prevent the check engine error code. this allows your ECU to "think" your stock narrowband sensor is still being heated... [/quote]I'll get bored later and figure out what wires you connect it between.

of course if you have your stock o2 sensor laying around, the quicker option would be what BillKlineVT mentioned keep in mind the O2 sensor WILL get hot though and you dont want it touching anything.

[skatanic28]

thanks guys, i'm gonna give that resistor setup a shot since i dont have the stock sensor anymore. ill post how it works out.

marc

[S13FX]

Ok like I asked in the question before heh, what if you only have one wire, would u just hook the resistors up to that one wire going to the O2 Sensor and Just tape off the other one ?

[Import_Ant]

the resistor is only to simulate the current draw of the heater element in the O2 sensor. you would disregard this completely since you dont have that heater element.

most Obd2 cars have 3 wires to the o2 sensor. a power source, a ground, and the input to the ecu from the o2 sensor. the power and ground run the heater element and the third is self-explanatory. if you disconnect the o2 sensor and just run a wire to the input (narrowband simulator) the ECU senses there is no current being drawn and throws a cel. the resistor just tricks the ECU into thinking the o2 sensor is plugged in because it allows there to be a current drawn from that circuit.

[S13FX]

ok cool, thats what I figured. Looks like Im going to have an xtra wire just chillin hehe

[skatanic28]

just a little follow-up....

i added a 20-watt resistance across the +12v and ground on the front o2 harness, and no CEL for 50 miles now!

p/n: 271-132 from radioshack for reference.

thanks again guys, maybe now i can pass inspection!