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Old 03-20-2012, 06:51 PM   #1
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How do I pull DTC's/clear MIL (check engine light)?

So I'm drivin' home today and BAM - little red light comes into my life, so...

How do I check codes on a 94 YJ? I imagine it's a jumper here and there, I just don't know which here or there.

I searched the forum but couldn't find an answer - sorry if this thread already exists.

Thanks

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Old 03-20-2012, 07:11 PM   #2
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Flip the ignition on and off three times not starting the vehicle, and third time leave I in the on position and then the check engine light it'll say solid for a sec then should start blinking at you

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Old 03-20-2012, 07:12 PM   #3
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Heres a site that lists the codes and the problem
http://www.jeephorizons.com/tech/yj_codes.html
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Old 03-20-2012, 07:48 PM   #4
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O snap - that is easy.

Thanks l'll check it out now.
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Old 03-20-2012, 07:52 PM   #5
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No prob
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Old 03-20-2012, 07:58 PM   #6
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Thanks, but I'm a bit confused off that info. It flashed {1 2 3 3 2 1 5 5} which I read as 12 33 21 55, meaning 12?? 33 A/C clutch(I dont have AC), 21 O2 sensor, 55 end of codes.

Is this just a bad o2 sensor, and do I only have one? What gives with the 12 and AC clutch codes?

Appreciate the help if anybody knows.
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Old 03-20-2012, 08:12 PM   #7
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Quote:
Originally Posted by BlueRidgeYJ
Thanks, but I'm a bit confused off that info. It flashed {1 2 3 3 2 1 5 5} which I read as 12 33 21 55, meaning 12?? 33 A/C clutch(I dont have AC), 21 O2 sensor, 55 end of codes.

Is this a bad o2 sensor, and do I only have one?

Appreciate the help if anybody knows.
12 is saying that the ECU has been disconnected within a certain amount of time, if you don't have AC then you don't have to worry about it, for the o2 sensor could be the connection or the sensor itself id check out the sensor connection and then reset everything and see what it says if not then you probal have a bad sensor
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Old 03-20-2012, 08:51 PM   #8
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Thanks again
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Old 03-21-2012, 01:18 AM   #9
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i am in the exact same boat as you man. exact same codes. and not passing smog. cracked exhaust manifold
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Old 03-21-2012, 03:59 AM   #10
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Thanks l'll check it out now.
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Old 03-21-2012, 04:05 AM   #11
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Yup mine gave me 12.33.55 I think but I didn't have engine light and no a/c.. Turns out my TPS was out and this think didn't pick it up. But I'm glad peeps here helped me troubleshoot
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Old 03-21-2012, 06:54 AM   #12
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That's what mine was when I had my light on throttle body position sensor and a/c but I don't have a/c so replaced the sensor, stripping the tiny Torx screws so made it even hard to replace, then it was off to change the starter
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Old 03-21-2012, 08:29 PM   #13
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So what ya'll are saying is code 33 w/o A/C means a bad TPS?

Does anyone know where I can find a wiring schematic of the relays?

Unrelated (I hope) - Stopped at the gas station today, got back in to start it and nothing. Dead stick. Fiddle with fuses, nothing blown, stick the key back in and it's alive. Go to start it, and nothing again, back to dead stick. Didn't want to be stuck, so push jumped it and drove home. I think the last owner did a PP install on the battery, and the ground isn't pulling enough current to start. Gotta get up tmrw and check it out, too dark to tinker with it tonight.

I'm seeing the fun in YJ ownership, it's a new puzzle everyday! It's actually pretty neat.
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Old 03-21-2012, 08:38 PM   #14
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Quote:
Originally Posted by BlueRidgeYJ
So what ya'll are saying is code 33 w/o A/C means a bad TPS?

Does anyone know where I can find a wiring schematic of the relays?

Nooo Code 33 is A/C relay, if u don't have A/C don't worry about it.

For TPS it would b code 24.... But u didn't get that... And neither did I... For some reason the computer didn't pick that up ..... But I went ahead and replaced the TPS cause that's what most on here suggested and it's working great!

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