I have a 1985 eldorado with a code 52 ( loss of voltage to ecm ) I need a trouble tree chart or some one who has had this problem to send me in the right direction . All three power leads to the ecm are hot
Cars & Trucks - Cadillac - Eldorado - 1985 Cadillac Eldorado
Answers & Comments
There is a 4.1 or 5.7. So here is a 4.1, In the fuse panel is battery fuse this is hot at al times,regardless if the key is on or not.This power goes to the ECM Pin 10 and 15. If power is verified then your problem is internal of your ECM.(they are prone to have weak solder joint causing all sort of problem with the module)
Dont junk it.Lets get away from faulting the ECM. Lets check spark You need to know that the Cadillac eldorado is famous for its distributor gear drive failure so even if you have spark is it firing at the right time and location? So pull a plug wire have some one crank it as you hold the spark plug close to engine ground. If there is spark that is a good thing. If there is no spark is the distributor turning?Take the distributor cap off and crank the engine does the distributor rotor turn? If not you will need a distributor gear drive. So take out the number one spark plug out and bring it to its compression and see if the timing marks lines up at TDC. From there is the distributor at the number one spark wire to fire it?
Check the drive gear of the distributor.That can also set code 52