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Q's on plx wb install

Old 04-28-2005, 02:17 AM
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Default Q's on plx wb install

I will be installing a plx m-300 W/B o2. I was going to replace my stock sensor with it, and i will be running uberdata also. The plx m-300 has both a narrowband and wideband out put on it. My question is do i conect both of those outputs to the o2sensor input on the ecu? That sounds wrong to me but i can't figure any other way.
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Old 04-28-2005, 05:36 AM
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Default Re: Q's on plx wb install

Connect the white (0-5v) wire when logging A/F's and connect the grey (simulated 0-1v) wire when done tuning/running closed loop.
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Old 04-28-2005, 07:39 AM
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Default Re: Q's on plx wb install

It's also suggested that you locate the WBO2 sensor on your downpipe rather than right up front... I don't know your setup, but I still have my OEM NBO2 in my manifold (HF) and I have an extra bung just before my cat on the downpipe. I cut the O2 wire at the ECU (D14? so the ECU gets no NB reading from the OEM sensor) and ran my WB wire from the PLX unit into the ECU so it gets a WB reading. You should also tap your PLX power and ground into the ECU as well. When you tap into the O2 wire with your WB readings, you need to make sure your bin has the O2 heater & closed loop shut off.

When you're done tuning, you can turn the closed loop back on (not sure about the heater with a WBO2 sensor) and switch the wires from the PLX unit so it's feeding a NB signal to your ECU (as stated above). Or you could just hook up your old NB sensor and take the PLX unit out. Just a matter of pereference I guess.
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Old 05-01-2005, 10:21 PM
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Default Re: Q's on plx wb install

I was thinking that if the wideband is going to be permantly installed, you could use a SPDT switch to toggle the input to the ecu from the WB output to the NB output and vise versa. Just a thought
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Old 05-01-2005, 10:53 PM
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Default Re: Q's on plx wb install

You'd need two switches or a DPDT (I think)

One to turn off WB and turn ON narrowband and vice-versa at the same time.
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Old 05-01-2005, 11:21 PM
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Default Re: Q's on plx wb install

Originally Posted by xenocron
You'd need two switches or a DPDT (I think)

One to turn off WB and turn ON narrowband and vice-versa at the same time.
Umm, I don't think so a single pole double throw switch basically has three terminals. You have one that is common and the two others. Hook the common one to the ecu and hook one each of the plx wires (NB and WB outputs) to the other two terminals. When you flip the switch one way you would have the the WB signal connected to the common terminal and consequently the ecu and when you flip the switch the other way, you would have the NB output hooked to the common terminal. When you flip the switch from one side to the other, the side that was previously connected to the output (common) will no longer be connected. Just think of it like a SPDT relay, except your not gonna have the electromechanical switch part. get me
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Old 05-02-2005, 10:30 AM
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Default Re: Q's on plx wb install

Yeah, thats what i was talking about...just all the S's, D's, P's and T's confuse me
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Old 05-02-2005, 09:37 PM
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Default Re: Q's on plx wb install

Originally Posted by xenocron
Yeah, thats what i was talking about...just all the S's, D's, P's and T's confuse me
It's all good, I know that ---- like the back of my hand. When it comes to tuning, there is ---- that confuses me and you know that like the back of your hand, just remember my handy dandy explanation when I need some help, lol. :P
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Old 05-03-2005, 09:29 PM
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Default Re: Q's on plx wb install

I was i little confused by the toggle swith thing I get the idea. I just used a car sterio speaker conector. It had two wires that had a plastic terminal on it with 2 male conectors on it, I use one one wire for the nb out out and the other for wb. And i have a female conector one the o2 sensor input on the ecu. That way i can just plug it to what ever input i need. I am not to sure about Grounding the resistor for the heated o2 sensor. I am gonna try and ground it to my battery ground.
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