Chevy Impala SS Forum banner

GM OBD2 Driving Cycle reset / Emissions Readiness

90K views 71 replies 11 participants last post by  BALLSS  
Hmm, if cali changed the readiness monitors limit from one to two, gonna suck even more for 96s.

But yeah you can change parameters so they always show passed.

I've been told one can swap ecms, pass smog, and swap back all on the same day ;)
 
you can see test below.
the mil function is high lighted, was he meaning it failed because the MIL didn't work right?

actually it was 2 and now 1...according to the tech. supposedly changed last year. Maybe I have always had 2 "fail" but still passed. IIRC the EGR never showed ready although it has one.

I emailed Ed to see if he can look at the file on his end to see if there is a keystroke he can do without fing up what has been a perfect tune IMHO

I have a spare PCM with the same tune. Have used it before just to confirm all works well. it does. It is just a spare
yeah I meant two now one but was on the iphone trying to type quickly.
it sucks that carb is changing things on older vehicles that didn't apply when they were new.

I know on Jet DSI its pretty straight forward to have the monitors all set as passed without changing other parameters, Gerry showed me where they were.
 
the MIL (aka check engine light) was not on. It comes on when key is turned then goes off once engine starts.

Not sure if the smog test procedure checks to illuminate it as a test.
The MIL has to work properly or it will fail the smog test, was curious because it was highlighted.
my 92 crown vic failed smog a few years ago because the MIL bulb burnt out and I didn't catch it, sold it to the state which worked out well.

I have a cheap code "reader" not scanner. There are no codes according to my "reader".

What really sucks is as of May 4, 2015 (source BAR book 1/22/2016 edition) 1996-1999 vehicles are allowed "any one" incomplete monitor function to fail....NOT 2

I would need to get a scan tool that reads those functions to see WTF is "not ready". I find it hard to believe after driving a few thousand miles without disconnecting battery that I have not completed "drive cycle"...a
I have a 10 yo Innova 3030a reader, it reads monitor status and still under $100 for the newest version.
Amazon.com: INNOVA 3030 Diagnostic Scan Tool/Code Reader with ABS for OBD2 Vehicles: n/a: Automotive

I know before the monitor settings were adjusted on my smog pcm there was one monitor would never clear even after a week of driving, can't remember what it was tho.

It's weird your test place won't tell you why it failed.
I've been going to the same test only place for the last 12 years and the owner has always told me what the cause was or if something was borderline.
 
  • Helpful
Reactions: admin