I am a little unclear on turning off the codes with Uprev.

Say for example, you get an O2 code (like P0172). When the ECU sees too rich of an AFR, it thinks there's a fueling malfunction and turns off the cam timing.

If you went in and disabled the P0172, does that just keep the CEL light from turning on, or will that also prevent the fault and make sure that the cam timing stays active?

 

The way I understand it is that when a certain set of conditions are reached, diagnostics run, and set off CELs. If you disable the CEL, you actually prevent the diagnostic from running (hence why some SRTs never go to ready for emissions testing). I know if some diagnostics fails, others fail to ever run (i.e. there is a sequence of successful tests that must occur for some sets of diagnostics).

I have read up on most of the DTCs and I've never heard of them disabling the cam timing if triggered. Of course an easy check would be to disable everything and see if your problem persists.

 

I'd like to know if they can be tuned to all say ready for plug in emissions checking.

 

Ray originally saw this when he tuned is Z back in the day. And we have mutliple dyno passes and even a street log on the way home where I had pending O2 codes and my cam timing was off. My cipher cable should be here Wed so I will play around with it all..




they cannot be made to say ready...
That would be highly illegal and no commercial product would offer a function like that.

 

Hmm, didn't know cams turn off with o2 codes.. same with rich/lean? No wonder my car was so less responsive and down on power with the antifoulers....

 

From my understanding, as far as the rear o2 sensor codes that pop up when you have TP's (for example), they go away as a result of them reading a proper A/F ratio AFTER the tune.

It is my interpretation that as a result of the A/F mixture being "tuned" the sensors read within the stock window of correct fuel mixture and therefore the codes dont pop up. I might be wrong about this as i have yet to tune my HR but this is how i understood it.

Speaking on the same rear o2 sensor CEL's i do not believe that they effect the performance of the car at all (ie cam timing disabled, etc.). Front bank heated o2's on the other hand i believe DO cause the car to go into limp mode.

Hope this helps, and maybe someone can chime in and verify this. I am curious of this as well as i am somewhat concerned in regards to when i have to smog my car here in CA after an ECU reflash.

 

Don't want to litter up this thread (plenty of info in the other one)... long story short.. my antifoulers would cause rich conditions that eventually threw bank lean codes. At least 03-04.5's you could indirectly lose the cams by messing with the rear o2's. If you want to discuss further join the party on the rear 02 thread, but please try to read the whole thing before posting!

 

^yea i have read through part of it, need to catch up.

Keep in mind, for the record, im speaking on behalf of what i know on 07-08 Z's...or at least what i THINK i know haha

 

You can make it say Ready in the ROM file but you have to find the value that says Not Ready and hex it out to say Ready. But I do not know for sure if it will actually be able to pass emissions even if it says Ready all the time, it could throw a SES light which is what happens whenever it finishes checking and something is actually malfunctioning, so you can still fail because of a SES light. Hexing out the wrong thing or adding too many characters can destroy the ECM or mess up engine control, but I have seen Uprev unplug the cable while flashing the ECM and it doesn't brick the ECM. It's not really worth the risk.