Question about 1990 Cadillac Deville

3 Answers

::check engine like::E49::

So the mechanic wasnt the nicest guy and didnt explain anything. I need to know how to fix this problem. I have the diagrams and everything but they mean nothing to me. i dont understand them.

I dont know what an "ECM" is and I dont know what the
"electric control valve"(ECV) is either.and "electric switching valve"(ESV) can someone help me please?

P.S. I want to work on the car myself, so easy to understand diagrams or explainations of where the parts are and what they look like would really help.


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  • kosmindtrip May 11, 2010

    what kind of car do you have? do you know what codes you are throwing?...the ECM is basically the computer of your car and it monitora all the various sensors....when a sensor is malfunctioning it sends a signal to the ecm...hence a check engine light...

    The Engine Control Unit or ECU is a designated computer that was developed to manage the engine control system. The ECM consists of electronics which are mounted on multi-layer circuit board

    . The ECM monitors and adjusts the air/fuel mixture and utilizes a catalytic converter to minimize amount of pollution produced from the engine. herses a few links to get you to at least understand what the components are...if i had more info i can help further:)

    thanks for the question hope to hear back from you..



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It sounds like you really would like to start repairng cars, and maybe take up being a mechanic for a living....

Check into your local Techincal College for classes..and some high schools that still offer tech classes for cars will teach the students using your pay for the parts..they get the knowlwedge/education, and everybody wins.

Good luck, and Happy New Year

Posted on Jan 01, 2009

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Your car uses first generation diagonstics. Very simple, basic, and easy to understand.

Also very easy to repair.

The code "E49" does not exist.

I don't need the actual code to tell you how to fix your car.

Just give me a:


explanation of the problem.

Posted on Dec 31, 2008

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If you really want to fix this problem yourslf then you will need to go to this site and buy a subscription for your car. It cost under 30.00 and is good for 1 year. They have test procedures, repair procedures, component locations, wiring diagrams etc, everything you will need. It is well worth the money. I looked up code E49 and there is no such code.  Do you know how ot pull up the trouble codes. Scan it again and tell me the correct code so I can help you.

Posted on Dec 31, 2008

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Go to and buy a subscription for your vehicle. If you want to repair it yourself you will need this data. It is good for 1 year and has, testing and inspection guides, component locations, wiring digrams and a lot of info the DIY'er needs.  I am looking in all my code manuals and still do not see an e49. AIR is a system that puts fresh air into your exhaust so the emissions at the tailpipe are lower. It's an EPA mandated system. If you have to pass an emissions test in your state or county you will have to get them system woking properly. Check out alldata it is worth the 30.00.

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