I've been trying to smog my 96 Elantra, but since the battery was
disconnected during some maintenance, none of the OBD tests are
reporting as completed.

They've told me to drive it for a couple weeks and see if the tests
reset, but since the registration is expired, I don't want to drive it
too much.

Anyone deal with this before?

 

Yeah. We had a customer who made only short trips and enough tests hadn't
run. The solution was that I took it home with me overnight and all the
tests ran in my 50 mile total drive.

Hyundai doesn't provide us with the details of what conditions the
computer needs to see in order to run all the tests, so I can't tell you.
It did seem that on the vehicle in question, some highway driving was
necessary. I also believe you'll need to make a cold start and drive at
least to operating temperature.

A good OBDII scan tool should be able to check whether the tests have run.
I don't know whether Auto Zone, etc. are willing to do this.

 

Thanks for the response.

So far I've logged 200 highway miles and another 50 or 60 local.
According to the smog techs (and the printout), none of the tests have
completed.

It's a bit of a pickle since I'm on a timeline for a "fixit" ticket
for the smog/reg.

I can't imagine that pulling the negative terminal would cause a
problem, but that's the only thing I can think of. Are there any other
conditions that would cause the OBDC to not run tests? Did something
not get plugged in?

 

Disconnecting the battery will cause the computer to lose memory of all
previous test results. Each time the battery is disconnected, the tests
will need to run again.

The computer decides whether to run the tests based on engine load,
coolant temperature, vehicle speed and other factors that must be met for
the tests to serve their designed purpose. For example, it would do
little good to test oxygen sensors immediately after a cold start, sicne
they're not fully warmed up and operating properly yet.

 

Someone gave me the cycle required to reset the OBD. Nice funky
requirements. Also, I need to investigate the thermostat I replaced
this summer. It may be something other than 195 deg. If that's the
case, my OBD may never reset...

 

hyundaitech wrote:
> Yeah. We had a customer who made only short trips and enough tests
hadn't
> run. The solution was that I took it home with me overnight and all
the
> tests ran in my 50 mile total drive.
>
> Hyundai doesn't provide us with the details of what conditions the
> computer needs to see in order to run all the tests, so I can't tell

WTF? HMA released TSBs for the monitor issue for all the early OBD-II
models just 2 years ago.
You're not aware of that? How is that possible?
This has been very much talked about issue for the last couple of
years.
Dealers get calls from indy shops about that all the time.
Oh I get it, you were working at a Canadian shop at that time!
Any other Canadian TSBs you'd like to share with us other than the one
about mismachined tranny case, "hyundaitech"?


>you.
> It did seem that on the vehicle in question, some highway driving was
> necessary. I also believe you'll need to make a cold start and drive
at
> least to operating temperature.
>
> A good OBDII scan tool should be able to check whether the tests have
run.
> I don't know whether Auto Zone, etc. are willing to do this.