Hi,

I have a 89 Cadillac Deville, 4.5 litre 273 cui.
Recently it began draining the battery after it sat for a day or two. The automatic level control comes on when the key isn't in the ignition , and the radiator cooling fans engage as soon as the key is in the ignition. Also engaging when the key is not in the ignition. Took a jump once after drain. About 2 weeks pass now it is drained again.
Replaced battery due to old one not takeing a charge.It was a 540 cca, I replaced it with a 770 cca. Now all it does is click when I turn it over. Was able to have some check for codes with a handheld diagnostics computer. Got a code 12 saying NO SPARK PULSE TO DISTRIBUTOR. Was told the starter is froze up.
That could have faulty ECM also ?
If so, is it inside the Distributor or under glove box ?
Had the BCM replaced less than a year ago. 5V wire short and a open found then.
Thanx for any help.

 

Sure it could.

Diagnosing a faulty ECM is almost always a process of elimination.
If everything else in the problem circuit is working to spec then the ecm is the culprit.
Problem is if you miss something along the way of your testing you end up with a new ecm that didn't fix your problem.

That said, fans running at key on was a first clue to a faulty ecm.


Under the glove box IIRC.