Diagnostic Codes?

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Bob - 29 Oct 2006 23:21 GMT

I am new to this group and a new owner of a 92 YJ. What is the best way
to look at diagnostic codes? The Maintenance Needed light is on and I
would like to check the codes. At a quick glance on the web it seems
like an expensive tool is needed? The vehicle has 120K miles and it
seems to run fine (the light just recently came on).

Thanks in Advance.

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DougW - 29 Oct 2006 23:42 GMT

> I am new to this group and a new owner of a 92 YJ. What is the best
> way to look at diagnostic codes? The Maintenance Needed light is on
> and I would like to check the codes. At a quick glance on the web it
> seems like an expensive tool is needed? The vehicle has 120K miles
> and it seems to run fine (the light just recently came on).

should be the same as my ZJ.
http://revbeergoggles.com/engine_codes.html

55 is end of codes
12 is not terribly important unless it comes with a bunch of others.
this code takes 50 starts to reset.

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DougW

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bllsht - 30 Oct 2006 01:58 GMT

If you're talking about the 'Maintenance Required' light, it is a
reminder to service emissions systems, not an indication that
something has failed. The 'Check Engine' light will tell you of a
failre.

You will need a scan tool to tell the PCM to turn off the maintenance
lamp.

>I am new to this group and a new owner of a 92 YJ. What is the best way
>to look at diagnostic codes? The Maintenance Needed light is on and I
[quoted text clipped - 3 lines]
>
>Thanks in Advance.

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Bob - 30 Oct 2006 02:05 GMT

You are correct, any sources for a scan tool? I searched previous posts
and there was some suggestions to remove the PCM. Does anyone know
where that is on a 92? I looked and I could not find it. Thanks

> If you're talking about the 'Maintenance Required' light, it is a
> reminder to service emissions systems, not an indication that
[quoted text clipped - 11 lines]
> >
> >Thanks in Advance.

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bllsht - 30 Oct 2006 04:45 GMT

The PCM is the engine controller. You don't want to remove that.
Removing the bulb would work.

Your YJ is OBD I, so you would need a scan tool with that capability.

>You are correct, any sources for a scan tool? I searched previous posts
>and there was some suggestions to remove the PCM. Does anyone know
[quoted text clipped - 15 lines]
>> >
>> >Thanks in Advance.

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Bob - 30 Oct 2006 12:25 GMT

Thanks for the replies, I plan to unplug the bulb.

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Matt Macchiarolo - 31 Oct 2006 22:46 GMT

Autozone will scan your code for free. More than likely an oxygen sensor in
the exhaust went bad. Unplugging the bulb will automatically fail emissions
inspection if your state requires it. Why not just find out what the problem
is and fix it?

That said, if it's a Maintenance Required reminder light and not the Check
Engine light, there should be some way to reset it, you might try asking a
dealer.

> Thanks for the replies, I plan to unplug the bulb.

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