Cadillac Repair: ECM Code E030 and noise from belt, autohelp, accurate diagnosis

Question
Hello,

I have an 89 Eldo 4.5L, 110,000 Miles. The SES illuminates right after startup. If I check the codes with the climate control, the only current code is E030, which I have thus far found to be ISC RPM Out of range.  The ISC Motor freaked out on me 2 weeks ago to the tune of 70MPH with my foot off the pedal. Had to 2-foot the brakes to safely stop, the engine died and killed the ignition module. Replaced Module and ISC Motor, still gets the code and idles high until I kick it down once it hits proper operating temperature.

Any Ideas?

Also, lots of noise coming from the serpentine belt drivern accessories, think it's the water pump- Big job? or no big deal? In other words, is this a driveway repair or do I need anything special?

Thanks in advance!

Eric - Detroit, MI

Answer
First thing I need to know is did you try and ADJUST anything at all to fix your problem ?.

I must know EVERYTHING you did.

The most common faults are:

1. A faulty ISC motor.

2. A faulty ECM (computer).

3. A shorted circuit.

4. An open circuit.


There are several pages of diagnostic tests that you must perform in order to get an accurate diagnosis and you will need to contact me at:

meperganfortis@msn.com

Pertaining to receiving these pictures and diagnostic test procedures by e-mail as this board does not allow the posting of this information on their website.



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