Cadillac: Service Engine Soon Light, control panel buttons, test sequences

Question
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Followup To
Question -
I have a 1990 Sedan Deville and the service engine
soon light has been on for 2 days.Car is running just fine.I had a new catalytic converter,oxygen sensor and had it decarb six weeks a go.I checked the codes in the fuel data center and they are as followed in this order.All may not be codes.
8.8.8      I know E49 is for air management system
..E        but what do the other codes mean? And
E49        what can I do to correct this problem ?
.E.E       And what it might cost me.
E49
.7.0  





Answer -
8.8.8 = is telling you that you have entered into the
       diagnostics sequence.

..E = designates ECM history codes.

E49 = Air management system fault.

.E.E = designates current codes.

E49 = Air management system fault.

.7.0 = the END of the E codes.


By pushing various other control panel buttons AFTER the .7.0 appears you can access the BCM codes and other test sequences of which are NOT related to your problem and or will NOT provide you with any useful information pertaining to your problem.


autohelp
What do you suggest i do about my problem to fix it ?
and what are BCM codes ?

Answer
As far as the E49 code you will need a diagnostics book in order to perform various tests on the air management system.

The BCM codes are aprt of your A/C-Heater system and are of no concern to your current problem.

What mechanical work or ANY kind of work has been performed on the vehicle recently ?. As most problems that occur after a recent repair was made can be traced back to the area of where the repair was made as a wire and or electrical connector may have been knocked loose and or left off. Check around the engine for loose wires and connectors.



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