OBD not ready and Fails the inspection

[DLNTHO]

Thanks tom4bre and Leon R for the info and actually The car fails the emission ( the OBD not ready )and the safety was pass now I had 450 miles to go for my next test and go to other station ...and the inspection station computer are connect to the DMV Data base ..I only need to get the OBD work ...by the way LEON R mention about the ECU . What is this about and what different between OBD?
MY battery is new and only the radio had a problem the sometime had sound sometime no sound when to go the bump the sound will on and off..

[tom4bren]

ECU (Electronic Control Unit) is another name for the Vehicle's computer.

OBD II (second generation of the On Board Diagnostics) is just a communication port to the ECU. It works much like the USB on your home computer.

Good luck with the next test.

[EVO]

I'm going to sound off on this because I had all kinds of codes popping up after I changed the battery. I had to clean both the positive and negative post clamps INSIDE and OUT so there was no corrossion left inside and wire brush those terminals till you see shiny metal. Install battery and viola all those nasty codes went away. Every time I hear battery replacement and electrical problems I go after the battery as it was the last thing I mucked with before my dashboard went wonky! Good luck!!

[DLNTHO]

Thanks EVO The problem is the OBD don't have any error code pop up and just OBD not Ready !!!! I still wait for 1600 miles (390 miles to go) to take another inspection .

[Leon R]

MY battery is new and only the radio had a problem the sometime had sound sometime no sound when to go the bump the sound will on and off..

That sure sounds (no pun intended ) like some sort of an oddity... That could be caused by a fault in the radio or by radio electrical feed. Can some one with radio knowledge chime in with this info?

My theory that your ECU feed is also faulty and your ECU gets reset intermittently. Then, EVAP gets triggered during the test, because it takes the longest to get readiness reading.

[DLNTHO]

Thanks Leon R ... I will try to remove the radio and keep driving until 1600 miles for my next inspection.

[Leon R]

I doubt that radio is causing the problem, but it could be showing you that something is not well with the electrical system. Are you by any chance loosing your radio station presets?

[Dmitrikr]

in Ontario we have same readyness test now. check this sitedrive clean might help.

[DLNTHO]

Hi LEON R .....I actually did not remove the radio only rewiring the radio ...now the radio had no problem ....see what happen for my next inspection.

Thanks Dmitrikr for the site .I will try on it ...in past 13 years I never had this problem before even I change my last battery ???

[DLNTHO]

Hi.. Is any one had any more idea ???? Today I go to inspection and fail again..before I go to inspection I was ask the shop to run the OBD and say not problem and no code come up and still come up OBD not Ready........

(ODB monitor readiness status
catalyst(G)/NMHC catalyst(D): not ready
Evaporative system (G)/UNSUPPORTED(D): not ready
O2 sensor(G)/Exhaust Gas Sensor (D): not ready
O2 sensor Heater (G)/ PM Filter (D): not ready
EGR/VVT(G,D): not ready
(G= gasoline; D= diesel)

The shop say may be the computer problem because when I change the battery and messes up the computer ??? or I just disconnect the battery again and drive more more miles ????

[Leon R]

If your battery is weak (even if it is new), the voltage drop during cranking could be resetting your computer every time you start the car. Check your voltage before, during and after cranking.

Also, ECU usually has a constant 12V supply to keep the memory. (That is in addition to ignition switched 12V). If that source has gone bad. Your will reset the computer EVERY time you shut it off.

[SinJin]

What Leon said.

Go to an auto parts store and have them do a starting/charging system check with their VAT-40 or whatever it is they are using for the tests.

It's cheap (free) and very easy (the parts guy will do it for you).
Good luck

[DLNTHO]

Thanks LEON R and SinJin ...I already go to AutoZone and test the starting/charging system check with their VAT-40 and everything pass nothing wrong??? The clerk say may be your computer had problem!!! In this case if any way possible use any thing to check the ECU??? Or had any more idea I can try before I need to replace the ECU...

Any one changes the ECU before??? And If I need to change the ECU ...did I need to re-program or just plug and play????

And any one had well but use ECU (for 1999 VX)for sale and how much??? ... In case I need one
Thanks

[bartmanS4]

I have one. I replaced mine with the Trooper one when I did the tranny swap. They should be plug and play.

[DLNTHO]

Thanks bartmanS4 and where u brought (which years)and how much ??