So WTF..... this isn't one or the other? I was under the impression I could do it Mrfreds in #59 or I could do it the acamus way in #117. If this truely is a combination of both then that is why its not working.

 

Acumus's post is for the ready monitors - makes them always "ready" or "complete" so you never worry about failing an OBD-II inspection if your state requires on whether you have all your emissions equipment hooked up or not. So you can disable rear O2, EGR, evap, etc and according to the ecu they will still be there, intact, and pass.

Mrfreds is the rear O2 heater patch so you can eliminate the rear O2 completely with no CEL, as long as you also run the rear O2 sim along with it.

They both work perfect.....but they each do there own thing.

 

Ok... all better. The combination of the two worked like a champ. Thanks to all that held my hand on this one.

 

glad you got yours working.. i still get a CEL.... this is starting to drive me nuts....

 

Just a word of thanks to acamus, mrfred, and quite a few others: my USDM '05 running 96530006 (er, actually 96530706t5) with no cat, rear O2, EGR, or resistor simulator just passed Illinois OBD-II testing without difficulty thanks to a few disabled periphery values and a some adjusted available/passed bits.

Edit: I should point out that it was only good enough to get me through emissions testing; about a mile down the road afterward, I threw a P0125, as expected, since I just disabled the rear O2 check in the periphery to get rid of the CEL long enough for the test to complete. A proper heater simulation/removal would be greatly appreciated for 96530006, but this was certainly good enough to get me past the immediate problem.

 

So I have read both threads and I still am a little confused about how to disable the rear o2 heater. Can I simply use Amacus's patch to remove cel/pass emissions for the rear o2 heater (I am running the o2 sim) or do I need to use both Mr. Fred's and Amacus's patches. I am attempting to do it on the 94170015 rom. Thank you for your help.

 

Mrfred's patch trick *** the computer into thinking the O2 is there when its not.

Amacus's patch trick *** the computer into sending "pass" result when queried.

They work together but the Amacus patch is not required unless you get tested.

 

how do you simulate the o2 heater for the 94170015 rom? I can find it for the evo9 roms but not for the 8. Please help

 

Jeff Jeske I found that you still need to enable Tephra's 5.1 mod to disable any related O2 codes as well.

 

^ You are correct.

 

I spent a bit of time tonight looking at your changes to 88590015, and started poking at 96530006 to see if this would be straightforward to port to the VIII ROMs. It took me a bit of time to find it, because I'm slow like that, but it looks like the subroutine you replaced at 0x44C10 in 88590015 lives at 0x2F9C0 in 96530006 (the jump table reference in 8859 at 0x2DC50 appears to be at 0x2C7A4 in 9653).

Comparing the original subroutine (not your modified version) in 88590015 to the one in 96530006, there appears to be a bit of difference between the VIII and IX code, although I haven't done an in-depth comparison yet. So before I get into this any further: did you ever port this over to a non-IX ROM, and I just missed the post? Or, would we be able to tempt you to dig into it just a little bit?

Also, it looks like nothing between 0x2F9C0 through 0x2FD49 (and the same chunk of subroutines in 8859) is referenced anywhere but as part of the heater circuit code; unless I'm missing something obvious, couldn't you yank the entire block of code, replace it with your (much shorter) sim, and use the remaining space for "other code"? Did you keep the old code around because it gets called from somewhere I'm missing, or was it just for safety/ease of reverting back?

tephra: do you still have plans to integrate this into a future release, if the details get worked out?

 

if you want it integrated into V7 then i need to know exactly how it works...

does it disable the heating function - ie if you install it onto a car WITH a rear02 will it break anything?

 

I don't believe this affects anything but the readiness testing for the heater circuit, but I'd have to defer to mrfred and acamus for a definitive answer. (I might be able to mash the keys, but it doesn't necessarily mean I know what I'm typing. )

 

You know, I'm looking at the code for 96530006 and comparing it to 88590015:

For 96530006: For 88590015: Assuming you already have acamus' readiness patch in place, is there any reason that these whole routines couldn't just be replaced with NOPs? That would effectively prevent the test from running, the same as setting FCA #8 (bit 3) to 0 would, but without the side effect of disabling all the other tests wrapped with that same periphery bit.

For a more refined approach, you could replace the MUT_D3 #8 comparison with a comparison to another location, to make it a toggle of it's own. (I'm thinking a "tephramod option" here. )

I may give this a try at lunch today, and see if the simple approach is "good enough".

 

As far as I understand it, MrFred's code just essentially clears the CEL when inside the parameters for it to occur.