- Jul 9, 2005
I know a proper sensor should cycle between .02 and I believe 1v but mine stays steady at 4.41. Would any thing cause it to read this high or is it simply no good and I'm thinking to much into this?
He also has the rear O2 value locked so the 0.51v is faked by DSMLink.The rear O2, if it has a wideband on it, we should see varying numbers there too. In this log I see 0.51 volts constant. AEMWB shows 9.1 to 1. I don't know if that jives with what AEM would say because I don't have any AEM wideband manuals that old (the 30-2301) and don't see one on AEM's website anymore! But it's surely wrong.
He also has the rear O2 value locked so the 0.51v is faked by DSMLink.
Thank you, I'll pick up a good brand front o2 and also inspect the wires while I'm connecting to be sure they're ok. If it still reads over 1v, I'll grab a use battery and give that test a try.On "Long Drive" the O2 voltage varies hardly at all, 4.37 to 4.43 is what I see. It's going in and out of closed loop at about the right times. It's going into open loop when load factor exceeds about 1.0 and is usually in closed loop at lower load factors. Looks like it's obeying the "OpenLoopThresholds" tables in ECU direct access, so that's good.
I can't tell but maybe your worst running is when it's in closed loop?
In ECU config, Misc, you can lock it into open loop. Have you tried that? Might be interesting.
I think what I would do is buy another new O2 sensor, a different brand than the one you have. Probably I'd get the Denso 2344026 or the NTK 23558, or get one straight from a Mitsu dealer (which would cost about $100 more though).
If you still get voltage readings from it in DSMlink that are over 1 volt, then I would check the accuracy of that input on your ecu. Because that's another thing that could be wrong. It might just be reading voltages wrong on that input.
You have to be careful to do that in a way that is "safe" for the ecu. The way I've done it before is with a small battery of the 1.5 volt type, like a AA or AAA cell. Preferably one that has been used a lot so it has less pizzaz than a new one. Probably it will put out just slightly over 1 volt. Anyway use a multimeter to measure the voltage of that battery with no load on it, so you know what it is, and then use it as the O2 signal voltage source instead of the O2 sensor and log that. It's a lot of words to describe well how to do that so let's save it for if it's needed. But you would do that with the engine off, and ignition key "On" so you can log.
I always thought a nernst cell could never put out more than about 1 volt. But I read something to the effect that if there is current leaking into it from somewhere, like maybe the heater circuit, then it can put out higher voltage.
Yeah and right next to each other.I can see how it would be easy to hook it to the wrong pin, especially when the wires are the same color.