AFM Disable Options

Marky Dissod · Sep 11, 2024

Charlie207 said:
How many miles do you have to drive for the readiness monitors to be set?

The answer has nothing to do with miles at all.
Each monitor has a different set of conditions for its self-test routines.
When that self-test passes, it considers itself 'Ready'. Before the test, it's 'Not Ready'. (It can also fail its test, and throw a code.)
Knew a mechanic in the mid-2000s, had a book that told how to drive (or NOT) based on which monitor(s) were not yet ready, to ready them as soon as possible.
Only a few customers were ever allowed to read it, most other customers paid him money to keep the car for two days so he could drive it as cited in the book.
He'd always return it to them 3-4 days later.

For example:
if your EVAP system is 'Not Ready', keep the tank as close to 1/2 as possible, and try to start the car (after shutting it off) when coolant temp is ≈176F-185F.
Again, NOTHING to do with miles.
O2 sensors simply need to warm up from the cold a few times.
Catalytic converter test basically involves the rear O2s reporting .1V or .2V consistently for a given period of time in closed loop.

gooffeyguy · Sep 11, 2024

And if I'm not mistaken, it differs with brand of vehicle. My 2002 mustang will pass all it's readiness monitors in a much shorter drive cycle then the 2012 yukon.

mikez71 · Sep 11, 2024

Marky Dissod said:
O2 sensors simply need to warm up from the cold a few times.

Like J91z said as well, it should be one of the earlier ones to be ready!? Weird...

Marky Dissod · Sep 11, 2024

mikez71 said:
Like J91z28d1 said as well, it should be one of the earlier ones to be ready!? Weird ...

O2 sensors should also respond PREDICTABLY to EGR activation and deactivation, 0% TPS decelerations, and for GMT900 & younger, Engine Half@$$ / Cylinder Confusion activation / deactivation.

Charlie207 · Sep 12, 2024

Marky Dissod said:
The answer has nothing to do with miles at all.
Each monitor has a different set of conditions for its self-test routines.
When that self-test passes, it considers itself 'Ready'. Before the test, it's 'Not Ready'. (It can also fail its test, and throw a code.)
Knew a mechanic in the mid-2000s, had a book that told how to drive (or NOT) based on which monitor(s) were not yet ready, to ready them as soon as possible.
Only a few customers were ever allowed to read it, most other customers paid him money to keep the car for two days so he could drive it as cited in the book.
He'd always return it to them 3-4 days later.

For example:
if your EVAP system is 'Not Ready', keep the tank as close to 1/2 as possible, and try to start the car (after shutting it off) when coolant temp is ≈176F-185F.
Again, NOTHING to do with miles.
O2 sensors simply need to warm up from the cold a few times.
Catalytic converter test basically involves the rear O2s reporting .1V or .2V consistently for a given period of time in closed loop.

Thanks

opfor2 · Sep 12, 2024

Marky Dissod said:
So, is California failing for detecting an aftermarket tune, or for detecting Not-Ready Monitors?
'cause it sounds like they're detecting Not-Ready Monitors, which the 'tune' is not properly handling.
That's NOT the same thing as detecting a 'tune'.

It's my understanding that they check for the OBDII not being ready and any codes.

Marky Dissod · Sep 12, 2024

opfor2 said:
It's my understanding that they check for the OBDII not being ready, and any codes.

Ok. So, unless the tune is so egregiously dumb as to roll coal, or some other blatant giveaway,
how could they possibly detect an aftermarket tune, if the checksums and CVNs are same as GM OE?

Doubeleive · Sep 12, 2024

Marky Dissod said:
Ok. So, unless the tune is so egregiously dumb as to roll coal, or some other blatant giveaway,
how could they possibly detect an aftermarket tune, if the checksums and CVNs are same as GM OE?

the "tune" check they do is primarily on the diesels, last time I had my "check" done they had no idea the blackbear tune was on it, passed with flying colors

Doubeleive · Sep 12, 2024

mikez71 said:
Not sure how many miles, it probably varies depending on length of drives. And I wonder if it even completes it in one cycle if you drove very far?

View attachment 437726

go drive it 50 miles at or under the speed limit, that should get to 1 not ready then you can get it passed. 1 not ready is allowed

Marky Dissod · Sep 12, 2024

Doubeleive said:
the "tune" check they do is primarily on the diesels,
last time I had my "check" done they had no idea the blackbear tune was on it, passed with flying colors.

They don't do a 'tune check', because they lack the software to read or download the operational files from the pcm.
They can only check checksums and CVNs.
They had no idea the BlackBear tune was on it because the BlackBear tune had the same checksums and CVNs as GM OE.

AFM Disable Options

Marky Dissod

Full Access Member

gooffeyguy

Tom

mikez71

Full Access Member

Marky Dissod

Full Access Member

Charlie207

Full Access Member

opfor2

Full Access Member

Marky Dissod

Full Access Member

Doubeleive

Wes

Doubeleive

Wes

Marky Dissod

Full Access Member

Similar threads

Forum statistics

Latest posts