1996 Hyundai Accent OBD not communicating

MITCHEM234

MEMBER
1996 HYUNDAI ACCENT
4 CYL
FWD
AUTOMATIC
89,000 MILES

Hello, I recently went for an emissions test and failed because my "Onboard Diagnostic" was not able to communicate with their system. Their is no check engine light on the dashboard but recently replaced my alternator & battery. The state said that my computer needs to be reset, how can I do that without spending a fortune? Is their a way I can reset this thing with the push of a button?

3 Replies

KHLOW2008

MECHANIC
41,815 POSTS

Hi Mitchem234,

After removal of battery, the stored values in the ECM has been reset to factory settings. The ECM needs to relearn so all you have to do is drive the car around and it should set itself ready for the diagnostic equipment. You might need to drive around for more than 100 miles before it is ready.

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Friday, July 4th, 2008 AT 8:59 AM

MITCHEM234

MEMBER
2 POSTS

KHLow2008,
After replacing the battery & alternator 2 months ago I have driven the car multiple times in excess of 100 miles and the ECM hasn't reset, so far. Maybe i'll disconnect the battery and try to reset by driving again.

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Sunday, July 6th, 2008 AT 5:47 PM

KHLOW2008

MECHANIC
41,815 POSTS

Hi Mitchem234,

I guess that is the best way.

One tip that might help.

After disconnecting and reconnecting the battery terminals, restart engine and don't drive the car first.

Leave all electrical components off. Let engine run till cooling fans starts and stop at least twice, switch on AC and let it run for 5 more minutes.

Turn off engine and restart.

You are ready to start driving.

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Monday, July 7th, 2008 AT 8:43 AM