Recently I hooked up my LC1. Which was a bit of a pain in the ***, my intention is to use the analog output to keep my test pipe from throwing a CEL. I also have the heater circuit in there, and analog 1 put to the rear o2 to the ecu. So I know I can offset the narrowband output to stop the CEL. What are the conditions that throw the "Catalytic Efficiency" code?

What would a cat do to AFRs? So I can simulate that it is in place?

 

It should make it look leaner, but doesn't the WB out run 0-5v and a narrow band run 0-1v?

 

Why don't you just leave your rear 02 in place (for the heater) and run my v5.10 mod?

You can then hook up the analogue output from the LC1 to the rear02 signal wire - so you can log WB AFR...

 

The LC1 has programmable analog outputs, by default analog #1 is a simulated narrowband signal.


This is the way I've wired it for now, I'd rather not do all those mods to the ECU at this point. But I can easily switch to using your sim patch without any physical changes, but it will fail emissions. If I can get the right narrowband curve, I believe I can get it to do what I want. And I do use the digital out for logging AFRs, so I don't need to retask the Rear O2 ADC.

 

I've gotten this fix working. I've been running it without CELs for a month now. It took a few tries to get the settings right, but this will work, for anyone curious or searching.

 

His rear O2 sim does not fail emissions, just to let you know as long as you have the O2 in place or a resistor. Mine passed here in NC with the OBDII computer and everything. If you download scantech you can see which tests are completed/passed/not yet completed. If you delete the rear O2 it will never complete the cat test, but if you use the rear O2 simulator it completes and everythign is all gravy.

 

I just passed PA inspection and emissions testing with this setup. No suprise, but I figured I'd add the results.

My Setup: LC1 w/ WBO2 in place of stock rear O2, resistor mod to ECU, LC1 Analog out to ECU to simulate stock NB Rear O2.

 

but whats the point in simulating the rear02?

just run my patch and then output a WB signal to the ECU so you can log the LC1 in evoscan via the ECU...

 

Point is that if you don't want to touch the software at all.

 

I have exactly similar setup now. What values did you give to the LC-1 analog channel 1?

I got my head spinning from thinking the reading and trying to adjust them.

From my own thinking I got that the values on post-cat O2 sensor should indicate low amount of oxygen because cat uses o2 -> meaning rich mixture -> meaning high voltages.

However steadly2004 said on this thread that post-cat should indicate lean mixture -> meaning low voltages. Also this source http://mike.focke.googlepages.com/oxygensensors mentions that post-cat o2 sensor should indicate low voltages. But doesn't that mean that it then idicates high amount of O2?

Well that got me confused now. So if you could give the programming data of LC-1 that works, It would be really appreciated!

Thanks!

 

well no wonder i dont understand then xD