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unable to read codes


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lepaha
Novice

Jun 20, 2009, 12:02 PM

Post #1 of 8 (2077 views)
unable to read codes Sign In

1994 chevrolet 454 in a motor home, engine running rough, check engine light on all the time. There is no wire connected to ALDL terminal A, I grounded terminal B, no effect, I grounded B-C-D-E and F one at a time, no effect, check engine light will not display code 12 or any other code. What do I do now?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 20, 2009, 12:32 PM

Post #2 of 8 (2071 views)
Re: unable to read codes Sign In

Your vehicle is in a transition year where they used mixed systems and components. Some of them use and OBD2 connectors on an OBD1 system. These vehicles can only be read using a professional scan tool.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



lepaha
Novice

Jun 20, 2009, 10:08 PM

Post #3 of 8 (2058 views)
Re: unable to read codes Sign In

Thank you, thank you, will the auto store code reader ($130) do the job or do I have to get a pro with a $3000 code reader?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 20, 2009, 10:30 PM

Post #4 of 8 (2056 views)
Re: unable to read codes Sign In

That one is probably going to require the $3000 tool unfortunately. The code reader only works with 100% OBD2.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



autojoe
User

Jun 21, 2009, 5:35 AM

Post #5 of 8 (2049 views)
Re: unable to read codes Sign In

you can probably get a used snap on mt2500 scan tool used on ebay for around 400-500 dollars.


Sidom
Veteran / Moderator
Sidom profile image

Jun 21, 2009, 5:48 AM

Post #6 of 8 (2045 views)
Re: unable to read codes Sign In


In Reply To
you can probably get a used snap on mt2500 scan tool used on ebay for around 400-500 dollars.



Ah yes the old "brick" even tho outdate probably on of the more durable SO scanners. Not a bad idea.
.
I'll just toss out one more suggestion. Maybe take it to one of the parts places that'll pull OBD II codes for free & see if by chance it'll read it. If not you're really no worse off. If it does read it & you do want you're own code puller......there you go...
.
On a side note...... I can't tell you how bad of an idea that was grounding all those pins on a OBD II DLC.... I'm just glad you didn't run 12v to them.....


way2old
Veteran / Moderator
way2old profile image

Jun 21, 2009, 6:20 AM

Post #7 of 8 (2043 views)
Re: unable to read codes Sign In

You are actually going to need an adapter that makes the OBD1 and OBDII compatable. You may be able to go to your local dealer(if there are any left around your area) and borrow one to read the code.



Being way2old is why I need help from younger minds


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 21, 2009, 12:53 PM

Post #8 of 8 (2037 views)
Re: unable to read codes Sign In

Yes, but you will still need the scan tool that will come with that adapter already.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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